Sylvie Bureau - Academia.edu (original) (raw)
Papers by Sylvie Bureau
Food Chemistry, 2014
NIR Spectroscopy ability was investigated to assess the fruit structure effect (passion fruit, to... more NIR Spectroscopy ability was investigated to assess the fruit structure effect (passion fruit, tomato and apricot) on prediction performance of soluble solids content (SSC) and titratable acidity (TA). Relationships between spectral wavelengths and SSC and TA were evaluated through the application of chemometric techniques based on partial least squares (PLS). Good prediction performance was obtained for apricot with correlation coefficients of 0.93 and 0.95 for SSC and TA and root mean square errors of prediction (RMSEP%) of 3.3% and 14.2%, respectively. For the passion fruit and tomato, the prediction models were not satisfactorily accurate due to the high RMSEP. Results showed that NIR technology can be used to evaluate apricot internal quality, however, it was not appropriate to evaluate internal quality in fruits with thick skin, (passion fruit), and/or heterogeneous internal structure (tomato).
Application of ATR-FTIR for a rapid and simultaneous determination of sugars and organic acids in apricot fruit
Food Chemistry, 2009
A simple, fast and accurate Fourier transform mid-infrared spectroscopy method was developed for ... more A simple, fast and accurate Fourier transform mid-infrared spectroscopy method was developed for simultaneously determining sugar and organic acid contents in apricot fruit slurries using the attenuated total reflectance. The potential of this method coupled with chemometric ...
PLOS ONE, 2015
Many biotic and abiotic parameters affect the metabolites involved in the organoleptic and health... more Many biotic and abiotic parameters affect the metabolites involved in the organoleptic and health value of fruits. It is therefore important to understand how the growers' decisions for cultivar and orchard management can affect the fruit composition. Practices, cultivars and/ or year all might participate to determine fruit composition. To hierarchize these factors, fruit weight, dry matter, soluble solids contents, titratable acidity, individual sugars and organics acids, and phenolics were measured in three apple cultivars ('Ariane', 'Melrose' and 'Smoothee') managed under organic, low-input and conventional management. Apples were harvested at commercial maturity in the orchards of the cropping system experiment BioREco at INRA Gotheron (Drôme, 26) over the course of three years (2011, 2012 and 2013). The main factors affecting primary and secondary metabolites, in both apple skin and flesh, were by far the cultivar and the yearly conditions, while the management system had a very limited effect. When considering the three cultivars and the year 2011 to investigate the effect of the management system per se, only few compounds differed significantly between the three systems and in particular the total phenolic content did not differ significantly between systems. Finally, when considering orchards grown in the same pedoclimatic conditions and of the same age, instead of the usual organic vs. conventional comparison, the effect of the management system on the apple fruit quality (Fruit weight, dry matter, soluble solids content, titratable acidity, individual sugars, organic acids, and phenolics) was very limited to non-significant. The main factors of variation were the cultivar and the year of cropping rather than the cropping system. More generally, as each management system (e.g. conventional, organic.. .) encompasses a great variability of practices, this highlights the importance of accurately documenting orchard practices and design beside the generic type of management in such studies.
This article is divided into three parts. The first part, the most important one, deals with spec... more This article is divided into three parts. The first part, the most important one, deals with spectroscopic methods. Different regions of the electromagnetic spectrum are useful for fruit quality characterisation, in particular the visible and near-infrared regions. Concerning the visible one, studies have been carried out on apple, apricot, cherry, mango, peach, red table grape and tomato, when the near-infrared one has been used on apple, apricot, bayberry, citrus, kiwi, lemon, mango, peach, pear, red bell pepper and tomato. Results of other spectroscopic methods such as time-domain reflectance spectroscopy, multi-and hyperspectral imaging, fluorescence, nuclear magnetic resonance and magnetic resonance imaging were obtained on apple, grape berry, kiwifruit, mandarin, olive, papaya, peach, pear, plum and tomato. The second part concerns the studies of mechanical properties based on impact, acoustic and ultrasonic responses, which were developed and tested on apple, avocado, peach, pear, plum, tomato and watermelon. The third part presents the analysis of volatile compounds using the principle of electronic nose applied on apple, mandarin, peach, pear and tomato. According to the researched fruit quality traits, the adequate methods will be different for the assessment of colour, firmness, soluble solids or volatiles or for the detection of internal defects like brown heart. However, methods are developed to improve the fruit management and thus the general fruit quality for consumers.
Glycosylated Flavor Precursor Extraction by Microwaves from Grape Juice and Grapes
Journal of Food Science, 1996
... Table 4Effect of the solvent on microwave extraction of glycosides from a juice of Muscat of... more ... Table 4Effect of the solvent on microwave extraction of glycosides from a juice of Muscat of Alexandria (µg/L) ... We thank Jean-Paul Lepoutre, Danielle Mascre, Robert Ratier for technical support and Jean-Claude Sapis for valuable advice.
Food Chemistry, 2011
The objective of this study was to investigate the possibility of predicting the quality paramete... more The objective of this study was to investigate the possibility of predicting the quality parameters of tomato by mid-infrared spectroscopy. For 2 years, tomato samples, representing a large variability in the chemical composition, were scanned using the attenuated total reflectance accessory of a Fourier transform spectrometer in the wavenumber region between 4000 and 400 cm À1
Are folates, carotenoids and vitamin C affected by cooking? Four domestic procedures are compared on a large diversity of frozen vegetables
LWT - Food Science and Technology, 2015
Plant foods for human nutrition (Dordrecht, Netherlands), 2010
We have investigated the effect of cultivation systems and fruit post-harvest management on the a... more We have investigated the effect of cultivation systems and fruit post-harvest management on the antioxidant properties of apricot fruits. Trees of five cultivars 'Tyrinthos', 'Cafona', 'Bella d'Italia', 'Vitillo' and 'Pellecchiella' were cultivated under integrated and organic systems. Fruits were collected at full maturity stage and analyzed either immediately or after storage at 4+/-0.5 degrees C and 85% of relative humidity for seven and 14 days. The main pomological traits (weight, colour, flesh firmness, total soluble sugars, titratable acidity) and antioxidant properties were analyzed. The total antioxidant capacity (TAC by TEAC method), total phenols content (TP by Folin-Ciocalteu method) and carotenoid content by HPLC-DAD were monitored. Cultivar characterization by principal component analysis (PCA) indicated a large variability on pomological and antioxidant properties of apricot fruits. 'Bella d'Italia' showed better...
Change in anthocyanin concentrations in red apricot fruits during ripening
LWT - Food Science and Technology, 2009
... While anthocyanins have received most attention in fruits of other Prunus species, including ... more ... While anthocyanins have received most attention in fruits of other Prunus species, including peach, nectarine and sweet cherry (Wu & Prior, 2005), studies on anthocyanins in apricots are rare. Sweet cherry fruits contain a major ...
Journal of the Science of Food and Agriculture, 2000
Effects of the modi®cation of whole vine or individual cluster light environment by shade cloth f... more Effects of the modi®cation of whole vine or individual cluster light environment by shade cloth from berry set to maturity were studied on the volatiles and glycoconjugates in Muscat (Muscat of Frontignan; Vitis vinifera L) berries over 2 years. Whole vines were shaded with 50 and 70% shade cloth, while bunches were shaded with 90% shade cloth. The sun-exposed berries were chosen as control berries, and the berries naturally shaded under foliage were also studied. The natural shading of bunches under foliage did not decrease the levels of free and bound compounds in Muscat berries compared to sun-exposed berries. The arti®cially shaded bunches showed lower levels of monoterpenols and C13 norisoprenoids than sun-exposed berries and berries from naturally shaded bunches. Moreover, the effect of vine shading on the aroma composition of Muscat berries was lower compared to arti®cial bunch shading. In 1996 the leaf area/fruit yield ratio was modi®ed by decreasing the bunch number per vine. This change did not in¯uence the total amounts of glycosidically bound compounds, except for monoterpenic glycoconjugates. However, the higher monoterpenic glycoconjugate levels in these berries were likely related to their early maturity. Under our experimental conditions, berry aroma composition did not appear to be affected by foliage shade.
Pink Discoloration of Canned Pears: Role of Procyanidin Chemical Depolymerization and Procyanidin/Cell Wall Interactions
Journal of Agricultural and Food Chemistry, 2013
After canning, pear pieces turn occasionally from whitish-beige to pink. Conditions were set up t... more After canning, pear pieces turn occasionally from whitish-beige to pink. Conditions were set up to obtain this discoloration systematically and investigate its mechanism. Canned pears showed a significantly lower L* coordinate compared with fresh pears, and the L* coordinate of canned pears decreased with decreasing pH. The values of the a* and b* coordinates increased significantly after processing, the increase being greater for the more acidic pH values, with corresponding redder colors. After canning, polyphenol concentrations decreased significantly, mainly due to loss of procyanidins. This supported the hypothesis of conversion of procyanidins to anthocyanin-like compounds. However, no soluble product was detected at 520 nm, the characteristic wavelength of anthocyanins. When purified procyanidins were treated at 95 °C at three different pH values (2.7, 3.3, and 4.0), procyanidin concentrations decreased after treatment, the more so as the pH was lower, and a pinkish color also appeared, attributed to tannin-anthocyanidin pigment. The pink color was bound to cell walls. Extraction of the neoformed pink entities was attempted by successive solvent extractions followed by cell wall degrading enzymes. The pink color persisted in the residues, and canned pears gave significantly higher amounts of residues after solvent and enzyme treatments than fresh pears. Procyanidins were the entities responsible for the appearance of pink discoloration. However, it seems that this pink discoloration also involved the formation of strong, probably covalent, bonds to the cell wall.
Application of Reflectance Colorimeter Measurements and Infrared Spectroscopy Methods to Rapid and Nondestructive Evaluation of Carotenoids Content in Apricot ( Prunus armeniaca L.)
Journal of Agricultural and Food Chemistry, 2008
The importance of carotenoid content in apricot (Prunus armeniaca L.) is recognized not only beca... more The importance of carotenoid content in apricot (Prunus armeniaca L.) is recognized not only because of the color that they impart but also because of their protective activity against human diseases. Current methods to assess carotenoid content are time-consuming, expensive, and destructive. In this work, the application of rapid and nondestructive methods such as colorimeter measurements and infrared spectroscopy has been evaluated for carotenoid determination in apricot. Forty apricot genotypes covering a wide range of peel and flesh colors have been analyzed. Color measurements on the skin and flesh ( L*, a*, b*, hue, chroma, and a*/ b* ratio) as well as Fourier transform near-infrared spectroscopy (FT-NIR) on intact fruits and Fourier transform mid-infrared spectroscopy (FT-MIR) on ground flesh were correlated with the carotenoid content measured by high-performance liquid chromatography. A high variability in color values and carotenoid content was observed. Partial least squares regression analyses between beta-carotene content and provitamin A activity and color measurements showed a high fit in peel, flesh, and edible apricot portion (R(2) ranged from 0.81 to 0.91) and low prediction error. Regression equations were developed for predicting carotenoid content by using color values, which appeared as a simple, rapid, reliable, and nondestructive method. However, FT-NIR and FT-MIR models showed very low R(2) values and very high prediction errors for carotenoid content.
Comparison of NIR and MIR spectroscopic methods for determination of individual sugars, organic acids and carotenoids in passion fruit
Food Research International, 2013
ABSTRACT In this work, NIR and MIR spectroscopy was investigated and compared for predicting pass... more ABSTRACT In this work, NIR and MIR spectroscopy was investigated and compared for predicting passion fruit ripening parameters as sugars, organic acids and carotenoids. Spectra of 56 samples of the lyophilized passion fruit were collected using an integrating sphere in NIR range and attenuated total reflectance accessory in MIR range. Individual sugars (sucrose, glucose and fructose), organic acids (malic and citric acids) and carotenoids (beta-carotene) contents were determined by reference methods. Spectral and reference data were analyzed by principal component analysis. Partial least square regression (PLSR) was used to establish calibration models. MIR technique was better than the NIR technique for glucose (R-v(2) = 0.942), fructose (R-v(2) = 0.855), sucrose (R-v(2) = 0.818), total sugar (R-v(2), = 0.914) and citric acid (R-v(2) = 0.913) content determination. On the other hand, NIR was superior for total acids (R-v(2) = 0.903) content determination. For malic acid and beta-carotene contents both methods were unsatisfactory due to low concentrations of these constituents in the passion fruits. (C) 2013 Published by Elsevier Ltd.
Aroma characterization of various apricot varieties using headspace–solid phase microextraction combined with gas chromatography–mass spectrometry and gas chromatography–olfactometry
Food Chemistry, 2006
... β-Cyclocitral was known as resulting of thermal, photo oxygenation or enzymatic degradation o... more ... β-Cyclocitral was known as resulting of thermal, photo oxygenation or enzymatic degradation of β-carotene the main carotenoid pigment found in apricot ( [Demole and Berthet, 1972] , [Drawert et al., 1981] , [Gloria et al., 1993] and [Kanasawud and Crouzet, 1990a] ), whereas 6 ...
Determination of the Composition in Sugars and Organic Acids in Peach Using Mid Infrared Spectroscopy: Comparison of Prediction Results According to Data Sets and Different Reference Methods
Analytical Chemistry, 2013
The prediction of internal quality properties, such as sweetness and acidity, in peach fruit by m... more The prediction of internal quality properties, such as sweetness and acidity, in peach fruit by mid infrared spectroscopy is of interest for rapid determination. Attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR) was tested here on two populations of peach fruits issued from contrasting genitors providing a large phenotypic variability. Over two successive years, 284 samples in 2006 and 483 samples in 2007 were characterized for soluble solids content (SSC), titratable acidity (TA), glucose, fructose, sucrose, malic acid, and citric acid contents. Sugar and organic acid composition were determined by three methods: colorimetric enzymatic measurements (ENZ), high-performance liquid chromatography (HPLC), or proton NMR spectroscopy ((1)H NMR), depending on the samples. For all samples, fruit homogenates were analyzed in ATR-FTIR using the same methodology and the same spectrometer. The objective here was to evaluate the effect of reference methods on the prediction performance. The best results were generally observed for SSC and TA, the percentage of the root-mean-square error of cross validation (RMSECV%) ranging respectively between 5.8% and 8.7% and between 5.9% and 8.0%, depending on the samples. For individual sugars and organic acids, the best correlations were obtained between ATR-FTIR data and ENZ reference data followed by HPLC and (1)H NMR ones.
Food Chemistry, 2009
A simple, fast and accurate Fourier transform mid-infrared spectroscopy method was developed for ... more A simple, fast and accurate Fourier transform mid-infrared spectroscopy method was developed for simultaneously determining sugar and organic acid contents in apricot fruit slurries using the attenuated total reflectance. The potential of this method coupled with chemometric techniques based on partial least squares was assessed by comparison with currently used enzymatic determination of sucrose, glucose, fructose, malic acid and citric acid. Fruits of eight contrasted cultivars harvested at different ripening stages were used in this study and randomly divided in a calibration set (505 apricots) and in a validation set (252 apricots). The most suitable region was found in the range between 1500 and 900 cm À1 . Good prediction performances were obtained (R 2 P 0.74 and RMSEP 6 18%). Results concerning the prediction of other quality traits such as firmness, skin colour, ethylene production, soluble solids content and titratable acidity were discussed.
Food Chemistry, 2014
NIR Spectroscopy ability was investigated to assess the fruit structure effect (passion fruit, to... more NIR Spectroscopy ability was investigated to assess the fruit structure effect (passion fruit, tomato and apricot) on prediction performance of soluble solids content (SSC) and titratable acidity (TA). Relationships between spectral wavelengths and SSC and TA were evaluated through the application of chemometric techniques based on partial least squares (PLS). Good prediction performance was obtained for apricot with correlation coefficients of 0.93 and 0.95 for SSC and TA and root mean square errors of prediction (RMSEP%) of 3.3% and 14.2%, respectively. For the passion fruit and tomato, the prediction models were not satisfactorily accurate due to the high RMSEP. Results showed that NIR technology can be used to evaluate apricot internal quality, however, it was not appropriate to evaluate internal quality in fruits with thick skin, (passion fruit), and/or heterogeneous internal structure (tomato).
Application of ATR-FTIR for a rapid and simultaneous determination of sugars and organic acids in apricot fruit
Food Chemistry, 2009
A simple, fast and accurate Fourier transform mid-infrared spectroscopy method was developed for ... more A simple, fast and accurate Fourier transform mid-infrared spectroscopy method was developed for simultaneously determining sugar and organic acid contents in apricot fruit slurries using the attenuated total reflectance. The potential of this method coupled with chemometric ...
PLOS ONE, 2015
Many biotic and abiotic parameters affect the metabolites involved in the organoleptic and health... more Many biotic and abiotic parameters affect the metabolites involved in the organoleptic and health value of fruits. It is therefore important to understand how the growers' decisions for cultivar and orchard management can affect the fruit composition. Practices, cultivars and/ or year all might participate to determine fruit composition. To hierarchize these factors, fruit weight, dry matter, soluble solids contents, titratable acidity, individual sugars and organics acids, and phenolics were measured in three apple cultivars ('Ariane', 'Melrose' and 'Smoothee') managed under organic, low-input and conventional management. Apples were harvested at commercial maturity in the orchards of the cropping system experiment BioREco at INRA Gotheron (Drôme, 26) over the course of three years (2011, 2012 and 2013). The main factors affecting primary and secondary metabolites, in both apple skin and flesh, were by far the cultivar and the yearly conditions, while the management system had a very limited effect. When considering the three cultivars and the year 2011 to investigate the effect of the management system per se, only few compounds differed significantly between the three systems and in particular the total phenolic content did not differ significantly between systems. Finally, when considering orchards grown in the same pedoclimatic conditions and of the same age, instead of the usual organic vs. conventional comparison, the effect of the management system on the apple fruit quality (Fruit weight, dry matter, soluble solids content, titratable acidity, individual sugars, organic acids, and phenolics) was very limited to non-significant. The main factors of variation were the cultivar and the year of cropping rather than the cropping system. More generally, as each management system (e.g. conventional, organic.. .) encompasses a great variability of practices, this highlights the importance of accurately documenting orchard practices and design beside the generic type of management in such studies.
This article is divided into three parts. The first part, the most important one, deals with spec... more This article is divided into three parts. The first part, the most important one, deals with spectroscopic methods. Different regions of the electromagnetic spectrum are useful for fruit quality characterisation, in particular the visible and near-infrared regions. Concerning the visible one, studies have been carried out on apple, apricot, cherry, mango, peach, red table grape and tomato, when the near-infrared one has been used on apple, apricot, bayberry, citrus, kiwi, lemon, mango, peach, pear, red bell pepper and tomato. Results of other spectroscopic methods such as time-domain reflectance spectroscopy, multi-and hyperspectral imaging, fluorescence, nuclear magnetic resonance and magnetic resonance imaging were obtained on apple, grape berry, kiwifruit, mandarin, olive, papaya, peach, pear, plum and tomato. The second part concerns the studies of mechanical properties based on impact, acoustic and ultrasonic responses, which were developed and tested on apple, avocado, peach, pear, plum, tomato and watermelon. The third part presents the analysis of volatile compounds using the principle of electronic nose applied on apple, mandarin, peach, pear and tomato. According to the researched fruit quality traits, the adequate methods will be different for the assessment of colour, firmness, soluble solids or volatiles or for the detection of internal defects like brown heart. However, methods are developed to improve the fruit management and thus the general fruit quality for consumers.
Glycosylated Flavor Precursor Extraction by Microwaves from Grape Juice and Grapes
Journal of Food Science, 1996
... Table 4Effect of the solvent on microwave extraction of glycosides from a juice of Muscat of... more ... Table 4Effect of the solvent on microwave extraction of glycosides from a juice of Muscat of Alexandria (µg/L) ... We thank Jean-Paul Lepoutre, Danielle Mascre, Robert Ratier for technical support and Jean-Claude Sapis for valuable advice.
Food Chemistry, 2011
The objective of this study was to investigate the possibility of predicting the quality paramete... more The objective of this study was to investigate the possibility of predicting the quality parameters of tomato by mid-infrared spectroscopy. For 2 years, tomato samples, representing a large variability in the chemical composition, were scanned using the attenuated total reflectance accessory of a Fourier transform spectrometer in the wavenumber region between 4000 and 400 cm À1
Are folates, carotenoids and vitamin C affected by cooking? Four domestic procedures are compared on a large diversity of frozen vegetables
LWT - Food Science and Technology, 2015
Plant foods for human nutrition (Dordrecht, Netherlands), 2010
We have investigated the effect of cultivation systems and fruit post-harvest management on the a... more We have investigated the effect of cultivation systems and fruit post-harvest management on the antioxidant properties of apricot fruits. Trees of five cultivars 'Tyrinthos', 'Cafona', 'Bella d'Italia', 'Vitillo' and 'Pellecchiella' were cultivated under integrated and organic systems. Fruits were collected at full maturity stage and analyzed either immediately or after storage at 4+/-0.5 degrees C and 85% of relative humidity for seven and 14 days. The main pomological traits (weight, colour, flesh firmness, total soluble sugars, titratable acidity) and antioxidant properties were analyzed. The total antioxidant capacity (TAC by TEAC method), total phenols content (TP by Folin-Ciocalteu method) and carotenoid content by HPLC-DAD were monitored. Cultivar characterization by principal component analysis (PCA) indicated a large variability on pomological and antioxidant properties of apricot fruits. 'Bella d'Italia' showed better...
Change in anthocyanin concentrations in red apricot fruits during ripening
LWT - Food Science and Technology, 2009
... While anthocyanins have received most attention in fruits of other Prunus species, including ... more ... While anthocyanins have received most attention in fruits of other Prunus species, including peach, nectarine and sweet cherry (Wu & Prior, 2005), studies on anthocyanins in apricots are rare. Sweet cherry fruits contain a major ...
Journal of the Science of Food and Agriculture, 2000
Effects of the modi®cation of whole vine or individual cluster light environment by shade cloth f... more Effects of the modi®cation of whole vine or individual cluster light environment by shade cloth from berry set to maturity were studied on the volatiles and glycoconjugates in Muscat (Muscat of Frontignan; Vitis vinifera L) berries over 2 years. Whole vines were shaded with 50 and 70% shade cloth, while bunches were shaded with 90% shade cloth. The sun-exposed berries were chosen as control berries, and the berries naturally shaded under foliage were also studied. The natural shading of bunches under foliage did not decrease the levels of free and bound compounds in Muscat berries compared to sun-exposed berries. The arti®cially shaded bunches showed lower levels of monoterpenols and C13 norisoprenoids than sun-exposed berries and berries from naturally shaded bunches. Moreover, the effect of vine shading on the aroma composition of Muscat berries was lower compared to arti®cial bunch shading. In 1996 the leaf area/fruit yield ratio was modi®ed by decreasing the bunch number per vine. This change did not in¯uence the total amounts of glycosidically bound compounds, except for monoterpenic glycoconjugates. However, the higher monoterpenic glycoconjugate levels in these berries were likely related to their early maturity. Under our experimental conditions, berry aroma composition did not appear to be affected by foliage shade.
Pink Discoloration of Canned Pears: Role of Procyanidin Chemical Depolymerization and Procyanidin/Cell Wall Interactions
Journal of Agricultural and Food Chemistry, 2013
After canning, pear pieces turn occasionally from whitish-beige to pink. Conditions were set up t... more After canning, pear pieces turn occasionally from whitish-beige to pink. Conditions were set up to obtain this discoloration systematically and investigate its mechanism. Canned pears showed a significantly lower L* coordinate compared with fresh pears, and the L* coordinate of canned pears decreased with decreasing pH. The values of the a* and b* coordinates increased significantly after processing, the increase being greater for the more acidic pH values, with corresponding redder colors. After canning, polyphenol concentrations decreased significantly, mainly due to loss of procyanidins. This supported the hypothesis of conversion of procyanidins to anthocyanin-like compounds. However, no soluble product was detected at 520 nm, the characteristic wavelength of anthocyanins. When purified procyanidins were treated at 95 °C at three different pH values (2.7, 3.3, and 4.0), procyanidin concentrations decreased after treatment, the more so as the pH was lower, and a pinkish color also appeared, attributed to tannin-anthocyanidin pigment. The pink color was bound to cell walls. Extraction of the neoformed pink entities was attempted by successive solvent extractions followed by cell wall degrading enzymes. The pink color persisted in the residues, and canned pears gave significantly higher amounts of residues after solvent and enzyme treatments than fresh pears. Procyanidins were the entities responsible for the appearance of pink discoloration. However, it seems that this pink discoloration also involved the formation of strong, probably covalent, bonds to the cell wall.
Application of Reflectance Colorimeter Measurements and Infrared Spectroscopy Methods to Rapid and Nondestructive Evaluation of Carotenoids Content in Apricot ( Prunus armeniaca L.)
Journal of Agricultural and Food Chemistry, 2008
The importance of carotenoid content in apricot (Prunus armeniaca L.) is recognized not only beca... more The importance of carotenoid content in apricot (Prunus armeniaca L.) is recognized not only because of the color that they impart but also because of their protective activity against human diseases. Current methods to assess carotenoid content are time-consuming, expensive, and destructive. In this work, the application of rapid and nondestructive methods such as colorimeter measurements and infrared spectroscopy has been evaluated for carotenoid determination in apricot. Forty apricot genotypes covering a wide range of peel and flesh colors have been analyzed. Color measurements on the skin and flesh ( L*, a*, b*, hue, chroma, and a*/ b* ratio) as well as Fourier transform near-infrared spectroscopy (FT-NIR) on intact fruits and Fourier transform mid-infrared spectroscopy (FT-MIR) on ground flesh were correlated with the carotenoid content measured by high-performance liquid chromatography. A high variability in color values and carotenoid content was observed. Partial least squares regression analyses between beta-carotene content and provitamin A activity and color measurements showed a high fit in peel, flesh, and edible apricot portion (R(2) ranged from 0.81 to 0.91) and low prediction error. Regression equations were developed for predicting carotenoid content by using color values, which appeared as a simple, rapid, reliable, and nondestructive method. However, FT-NIR and FT-MIR models showed very low R(2) values and very high prediction errors for carotenoid content.
Comparison of NIR and MIR spectroscopic methods for determination of individual sugars, organic acids and carotenoids in passion fruit
Food Research International, 2013
ABSTRACT In this work, NIR and MIR spectroscopy was investigated and compared for predicting pass... more ABSTRACT In this work, NIR and MIR spectroscopy was investigated and compared for predicting passion fruit ripening parameters as sugars, organic acids and carotenoids. Spectra of 56 samples of the lyophilized passion fruit were collected using an integrating sphere in NIR range and attenuated total reflectance accessory in MIR range. Individual sugars (sucrose, glucose and fructose), organic acids (malic and citric acids) and carotenoids (beta-carotene) contents were determined by reference methods. Spectral and reference data were analyzed by principal component analysis. Partial least square regression (PLSR) was used to establish calibration models. MIR technique was better than the NIR technique for glucose (R-v(2) = 0.942), fructose (R-v(2) = 0.855), sucrose (R-v(2) = 0.818), total sugar (R-v(2), = 0.914) and citric acid (R-v(2) = 0.913) content determination. On the other hand, NIR was superior for total acids (R-v(2) = 0.903) content determination. For malic acid and beta-carotene contents both methods were unsatisfactory due to low concentrations of these constituents in the passion fruits. (C) 2013 Published by Elsevier Ltd.
Aroma characterization of various apricot varieties using headspace–solid phase microextraction combined with gas chromatography–mass spectrometry and gas chromatography–olfactometry
Food Chemistry, 2006
... β-Cyclocitral was known as resulting of thermal, photo oxygenation or enzymatic degradation o... more ... β-Cyclocitral was known as resulting of thermal, photo oxygenation or enzymatic degradation of β-carotene the main carotenoid pigment found in apricot ( [Demole and Berthet, 1972] , [Drawert et al., 1981] , [Gloria et al., 1993] and [Kanasawud and Crouzet, 1990a] ), whereas 6 ...
Determination of the Composition in Sugars and Organic Acids in Peach Using Mid Infrared Spectroscopy: Comparison of Prediction Results According to Data Sets and Different Reference Methods
Analytical Chemistry, 2013
The prediction of internal quality properties, such as sweetness and acidity, in peach fruit by m... more The prediction of internal quality properties, such as sweetness and acidity, in peach fruit by mid infrared spectroscopy is of interest for rapid determination. Attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR) was tested here on two populations of peach fruits issued from contrasting genitors providing a large phenotypic variability. Over two successive years, 284 samples in 2006 and 483 samples in 2007 were characterized for soluble solids content (SSC), titratable acidity (TA), glucose, fructose, sucrose, malic acid, and citric acid contents. Sugar and organic acid composition were determined by three methods: colorimetric enzymatic measurements (ENZ), high-performance liquid chromatography (HPLC), or proton NMR spectroscopy ((1)H NMR), depending on the samples. For all samples, fruit homogenates were analyzed in ATR-FTIR using the same methodology and the same spectrometer. The objective here was to evaluate the effect of reference methods on the prediction performance. The best results were generally observed for SSC and TA, the percentage of the root-mean-square error of cross validation (RMSECV%) ranging respectively between 5.8% and 8.7% and between 5.9% and 8.0%, depending on the samples. For individual sugars and organic acids, the best correlations were obtained between ATR-FTIR data and ENZ reference data followed by HPLC and (1)H NMR ones.
Food Chemistry, 2009
A simple, fast and accurate Fourier transform mid-infrared spectroscopy method was developed for ... more A simple, fast and accurate Fourier transform mid-infrared spectroscopy method was developed for simultaneously determining sugar and organic acid contents in apricot fruit slurries using the attenuated total reflectance. The potential of this method coupled with chemometric techniques based on partial least squares was assessed by comparison with currently used enzymatic determination of sucrose, glucose, fructose, malic acid and citric acid. Fruits of eight contrasted cultivars harvested at different ripening stages were used in this study and randomly divided in a calibration set (505 apricots) and in a validation set (252 apricots). The most suitable region was found in the range between 1500 and 900 cm À1 . Good prediction performances were obtained (R 2 P 0.74 and RMSEP 6 18%). Results concerning the prediction of other quality traits such as firmness, skin colour, ethylene production, soluble solids content and titratable acidity were discussed.