mahrokh nemati - Academia.edu (original) (raw)

Papers by mahrokh nemati

Research paper thumbnail of Use of Protein Hydrolysates from Caspian Sea Sprat (Clupeonella Cultiventris) as a Nitrogen Source for Bacteria Growth Media (Vibrio Anguillarum, Bacillus Licheniformis, Bacillus Subtilis)

Research paper thumbnail of Effect of Chitosan Edible Coating Enriched with Eucalyptus Essential Oil and α‐Tocopherol on Silver Carp Fillets Quality During Refrigerated Storage

Journal of Food Safety, 2016

The effects of chitosan coating incorporated with eucalyptus essential oil and α‐tocopherol on th... more The effects of chitosan coating incorporated with eucalyptus essential oil and α‐tocopherol on the quality of silver carp fillet during chilled storage (4 + 1°C) were examined over a period of 16 days. The control samples (without any coating), chitosan coating (CH), chitosan coating incorporated with eucalyptus essential oil (CH+EEO) and chitosan coating incorporated with eucalyptus essential oil and α‐tocopherol (CH+EEO+α) were analyzed by chemical, microbiological and sensory characteristics. Results showed that, total viable counts, total psychrotrophic counts and total volatile basic nitrogen of CH+EEO and CH+EEO+α were significantly lower than control and CH (P ≤ 0.05). Addition of α‐tocopherol to EEO retarded lipid oxidation. According to the sensory analysis results, CH+EEO+α was acceptable even at the end of the 16‐day storage. The results indicated that chitosan coating was improved extending of meat shelf life. Using eucalyptus essential oil and α‐tocopherol increased its...

Research paper thumbnail of Effects of stocking density and feeding frequency on the growth parameters and hematocrit of the Rutilus rutilus caspicus juvenile

Nova Biologica Reperta, 2018

Feeding frequency and stocking density are important factors affecting growth and maturation of c... more Feeding frequency and stocking density are important factors affecting growth and maturation of cultured fish. The aims of this investigation were to determine the effects of stocking density (10, 20, 30 and 40 fish per aquarium) and feeding frequency (2, 3 and 4 times on daily) on growth parameters and hematocrit of the Rutilus rutilus caspicus juveniles. The experiment was continued for 45 days in two replicates. The results of this study showed that growth parameters, including weight gain (WG), feed conversion ratio (FCR) and specific growth rate (SGR) were affected significantly by stocking density(P<0.05), but not significantly affected by feeding frequency (P>0.05). The highest WG and SGR were recorded with the lowest stocking density (10 fish / aquarium). The least FCR was obtained in density of 10 fish/aquarium, FCR value was significantly higher with high stocking density (P<0.05). Also, interactions between stocking density and feeding frequency were no significant on growth parameters (P>0.05). Density and feeding frequency had no significant effect of hematocrit concentration (P>0.05). On the other hand, interactions between stocking density and feeding frequency significantly affected hematocrit levels (P<0.05). The lower level of hematocrit was observed in density of 10 fish/aquarium at two times / day feeding frequency. The results of this study indicated that density is significantly affected the growth, but increasing of feeding frequency there is not effect on growth in the Rutilus rutilus caspicus.

Research paper thumbnail of Effect of whey Protein Concentrate Coating Cinamon Oil on Quality and Shelf Life of Refrigerated Beluga Sturegeon (Huso huso)

Journal of Food Quality, 2016

This study evaluated the effect of whey protein concentrate (WPC) coating incorporated with 1.5% ... more This study evaluated the effect of whey protein concentrate (WPC) coating incorporated with 1.5% cinnamon essential oil (CEO) on the quality of beluga sturgeon (Huso huso) fillet during refrigerated storage (4 ± 1C). Microbial, chemical, and sensorial properties of the fillets were measured for 20 days. Whey protein edible coating containing 1.5% CEO could extend preserving ability of beluga sturgeon by about 8 days by retarding lipid oxidation and microbial deterioration as reflected by Peroxide Value, Thiobarbituric acid and total viable count. Samples coated with WPC containing CEO also had the lowest pH and Total Volatile Basic Nitrogen. Moreover, the coating did not negatively affect sensory attributes of the fillets.Practical ApplicationsExtensive research has shown the potential application of natural antimicrobial agents in food preservation. But the efficiency of these materials is limited due to intense odor and aroma changes as well as organoleptic problems. One strategy ...

Research paper thumbnail of A Study on the Properties of Alosa (Alosa caspia) By-Products Protein Hydrolysates Using Commercial Enzymes

Abstract: In current study, protein hydrolysates were produced using microbial proteases of Alcal... more Abstract: In current study, protein hydrolysates were produced using microbial proteases of Alcalase, Protamex and Flavourzyme from by-products (head, skin and viscera) of Alosa (Alosa caspia), a major Clupeonella species in the Caspian Sea. The results indicated that the protein hydrolysate from Alcalase, had the highest protein content (78.91%), protein recovery (80.42%) and degree of hydrolysis (21.06%). No significant differences in lipid were observed among the enzymes (P>0.05). The results of amino acids composition showed that all hydrolysates were almost similar in amino acids composition. In addition, the protein efficiency ratio showed that all hydrolysates had high nutritional value. The chemical score results indicated that all hydrolysates could fulfill human amino acid requirements. While, in comparison with common carp requirements, the amino acids of methionine, lysine, phenyl alanine and threonine were the limiting amino acids in hydrolysates. According to the re...

Research paper thumbnail of Optimization of the production of protein hydrolysates from common Kilka (Clupeonella cultiventris) using protease enzyme (Promod)

Journal of Marine Biology, 2015

Fish protein hydrolysates were produced from Kilka (Clupeonella cultiventris), a major clupeonell... more Fish protein hydrolysates were produced from Kilka (Clupeonella cultiventris), a major clupeonella species in the Caspian Sea. Fish protein hydrolysate was produced from the hydrolysis conditions (enzyme/protein substrate concentration %, temperature, and time) were optimized using response surface methodology. The optimum conditions to reach the highest degree of hydrolysis were: 39.64°C, 21.02 min, and a protease (Promod) 1.36 %. Kilka protein hydrolysates had relatively high protein (75.36%).

Research paper thumbnail of Use of Protein Hydrolysates from Caspian Sea Sprat (Clupeonella Cultiventris) as a Nitrogen Source for Bacteria Growth Media (Vibrio Anguillarum, Bacillus Licheniformis, Bacillus Subtilis)

Research paper thumbnail of Effect of Chitosan Edible Coating Enriched with Eucalyptus Essential Oil and α‐Tocopherol on Silver Carp Fillets Quality During Refrigerated Storage

Journal of Food Safety, 2016

The effects of chitosan coating incorporated with eucalyptus essential oil and α‐tocopherol on th... more The effects of chitosan coating incorporated with eucalyptus essential oil and α‐tocopherol on the quality of silver carp fillet during chilled storage (4 + 1°C) were examined over a period of 16 days. The control samples (without any coating), chitosan coating (CH), chitosan coating incorporated with eucalyptus essential oil (CH+EEO) and chitosan coating incorporated with eucalyptus essential oil and α‐tocopherol (CH+EEO+α) were analyzed by chemical, microbiological and sensory characteristics. Results showed that, total viable counts, total psychrotrophic counts and total volatile basic nitrogen of CH+EEO and CH+EEO+α were significantly lower than control and CH (P ≤ 0.05). Addition of α‐tocopherol to EEO retarded lipid oxidation. According to the sensory analysis results, CH+EEO+α was acceptable even at the end of the 16‐day storage. The results indicated that chitosan coating was improved extending of meat shelf life. Using eucalyptus essential oil and α‐tocopherol increased its...

Research paper thumbnail of Effects of stocking density and feeding frequency on the growth parameters and hematocrit of the Rutilus rutilus caspicus juvenile

Nova Biologica Reperta, 2018

Feeding frequency and stocking density are important factors affecting growth and maturation of c... more Feeding frequency and stocking density are important factors affecting growth and maturation of cultured fish. The aims of this investigation were to determine the effects of stocking density (10, 20, 30 and 40 fish per aquarium) and feeding frequency (2, 3 and 4 times on daily) on growth parameters and hematocrit of the Rutilus rutilus caspicus juveniles. The experiment was continued for 45 days in two replicates. The results of this study showed that growth parameters, including weight gain (WG), feed conversion ratio (FCR) and specific growth rate (SGR) were affected significantly by stocking density(P<0.05), but not significantly affected by feeding frequency (P>0.05). The highest WG and SGR were recorded with the lowest stocking density (10 fish / aquarium). The least FCR was obtained in density of 10 fish/aquarium, FCR value was significantly higher with high stocking density (P<0.05). Also, interactions between stocking density and feeding frequency were no significant on growth parameters (P>0.05). Density and feeding frequency had no significant effect of hematocrit concentration (P>0.05). On the other hand, interactions between stocking density and feeding frequency significantly affected hematocrit levels (P<0.05). The lower level of hematocrit was observed in density of 10 fish/aquarium at two times / day feeding frequency. The results of this study indicated that density is significantly affected the growth, but increasing of feeding frequency there is not effect on growth in the Rutilus rutilus caspicus.

Research paper thumbnail of Effect of whey Protein Concentrate Coating Cinamon Oil on Quality and Shelf Life of Refrigerated Beluga Sturegeon (Huso huso)

Journal of Food Quality, 2016

This study evaluated the effect of whey protein concentrate (WPC) coating incorporated with 1.5% ... more This study evaluated the effect of whey protein concentrate (WPC) coating incorporated with 1.5% cinnamon essential oil (CEO) on the quality of beluga sturgeon (Huso huso) fillet during refrigerated storage (4 ± 1C). Microbial, chemical, and sensorial properties of the fillets were measured for 20 days. Whey protein edible coating containing 1.5% CEO could extend preserving ability of beluga sturgeon by about 8 days by retarding lipid oxidation and microbial deterioration as reflected by Peroxide Value, Thiobarbituric acid and total viable count. Samples coated with WPC containing CEO also had the lowest pH and Total Volatile Basic Nitrogen. Moreover, the coating did not negatively affect sensory attributes of the fillets.Practical ApplicationsExtensive research has shown the potential application of natural antimicrobial agents in food preservation. But the efficiency of these materials is limited due to intense odor and aroma changes as well as organoleptic problems. One strategy ...

Research paper thumbnail of A Study on the Properties of Alosa (Alosa caspia) By-Products Protein Hydrolysates Using Commercial Enzymes

Abstract: In current study, protein hydrolysates were produced using microbial proteases of Alcal... more Abstract: In current study, protein hydrolysates were produced using microbial proteases of Alcalase, Protamex and Flavourzyme from by-products (head, skin and viscera) of Alosa (Alosa caspia), a major Clupeonella species in the Caspian Sea. The results indicated that the protein hydrolysate from Alcalase, had the highest protein content (78.91%), protein recovery (80.42%) and degree of hydrolysis (21.06%). No significant differences in lipid were observed among the enzymes (P>0.05). The results of amino acids composition showed that all hydrolysates were almost similar in amino acids composition. In addition, the protein efficiency ratio showed that all hydrolysates had high nutritional value. The chemical score results indicated that all hydrolysates could fulfill human amino acid requirements. While, in comparison with common carp requirements, the amino acids of methionine, lysine, phenyl alanine and threonine were the limiting amino acids in hydrolysates. According to the re...

Research paper thumbnail of Optimization of the production of protein hydrolysates from common Kilka (Clupeonella cultiventris) using protease enzyme (Promod)

Journal of Marine Biology, 2015

Fish protein hydrolysates were produced from Kilka (Clupeonella cultiventris), a major clupeonell... more Fish protein hydrolysates were produced from Kilka (Clupeonella cultiventris), a major clupeonella species in the Caspian Sea. Fish protein hydrolysate was produced from the hydrolysis conditions (enzyme/protein substrate concentration %, temperature, and time) were optimized using response surface methodology. The optimum conditions to reach the highest degree of hydrolysis were: 39.64°C, 21.02 min, and a protease (Promod) 1.36 %. Kilka protein hydrolysates had relatively high protein (75.36%).