Liliana Ceci - Academia.edu (original) (raw)

Papers by Liliana Ceci

La produccion de aceites de oliva virgen en Argentina se incremento en los ultimos anos y si bien... more La produccion de aceites de oliva virgen en Argentina se incremento en los ultimos anos y si bien el consumo interno presenta un paulatino incremento, el principal destino es la exportacion. En este trabajo se presentan resultados de los analisis quimicos y descriptores sensoriales de aceites de oliva virgenes monovarietales de diferentes zonas de la provincia de San Juan, enmarcados dentro de un proyecto de investigacion del que participan la UCCuyo y la UNS, que abarca dos cosechas consecutivas y diferentes varietales. En la cosecha 2012, se evaluaron frutos de los varietales Arbequina (6 muestras, Indices de Maduracion, IM= 2,52-5,22), Coratina (5 muestras, IM=1,60-2,97), Changlot (4 muestras, IM=4,60-5,06) y Maurino (2 muestras, IM=1,76 y 3,55). En la cosecha 2013 se optimizaron los IM con el objeto de obtener aceites de mejor calidad, para los varietales Arbequina (6 muestras, IM=0,32-3,27), Coratina (4 muestras, IM=0,33-1.36) y Changlot (6 muestras, IM=2,53-3,33) y se incorpor...

Sludge: Types, Treatment Processes and Disposal, 2009

Oilseed world production in 2007/2008 was 391.2 Mt with a contribution of 56.4 % for soybean and ... more Oilseed world production in 2007/2008 was 391.2 Mt with a contribution of 56.4 % for soybean and 7.0 % for sunflower, according to United States Department of Agriculture (USDA) data. During the same period, 128.0 Mt of oils from seeds were produced along the world, including 29.3 % of soybean oil and 7.8 % of sunflower oil. During processing, some millions of tons of sludge or gums are generated in water degumming step, to remove impurities and obtain oils without turbidity and stable with respect flavor and odor. Degumming sludge is a complex mixture comprising high water content, phospholipids (PLs), oil, and minor amounts of other constituents like phytoglycolipids, phytosterols, tocopherols, and fatty acids. PL fraction in degumming sludge principally includes phosphatidylcholine (PC), phosphatidylethanolamine (PE), phosphatidylinositol (PI), and phosphatidic acid (PA). In this chapter, some traditional industrial processes to produce, purify, and fractionate lecithin, from degumming sludge are presented. These processes include drying and deoiling with acetone, a solvent in which PLs, glycolipids and related compounds are almost insoluble. Lecithin is used as emulsifiers, dispersing and release agent in food, pharmaceutical and cosmetic industries. Methods still not applied at industrial scale for extraction and partition of PLs using supercritical fluids, and processes for chemical and enzymatic modifications of lecithin are also reviewed in this chapter, with their advantages and disadvantages. Enriched lecithin in any component such us PC or PI, with distinctive surface-active properties can be obtained by lecithin fractionation with solvents. Special attention is dedicated in this review to novel structured PLs that can be obtained by enzymatic reactions to exchange fatty acids in natural PLs. These PLs are high-priced fine chemicals for membrane and lipoprotein investigation, cosmetic industries, and liposome technology to release food and medicament components. The extensive availability of different lipases and phospholipases, fatty acids and derivatives, including polyunsaturated fatty acids, to modify natural PLs and generate products with new physical and chemical properties, open a large investigation field at immediate future. Results of recent own investigation about recovery occluded oil in soybean degumming sludge, by water elimination and acetone extraction, and study on quality and stability indexes in recovered oils, in view to their re-insertion in productive process, are also shown in this review.Fil: Ceci, Liliana Noemí. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Planta Piloto de Ingeniería Química. Universidad Nacional del Sur. Planta Piloto de Ingeniería Química; ArgentinaFil: Constenla, Diana Teresita. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Planta Piloto de Ingeniería Química. Universidad Nacional del Sur. Planta Piloto de Ingeniería Química; Argentin

Fil: Ceci, Liliana Noemi. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cien... more Fil: Ceci, Liliana Noemi. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Conicet - Bahia Blanca. Planta Piloto de Ingenieria Quimica. Universidad Nacional del Sur. Planta Piloto de Ingenieria Quimica; Argentina

Food Research International, 2017

Journal of the American Oil Chemists' Society, 2017

Acta Horticulturae, 2012

ABSTRACT In the last years, irrigation control in agricultural soils has been mainly focused on t... more ABSTRACT In the last years, irrigation control in agricultural soils has been mainly focused on the optimization of the use of water resources, in order to overcome the difficulties imposed by a growing water demand and to reduce extraction costs. This work presents the field implementation of an automatic irrigation controller, as a novel approach for water resource optimization. The developed closed-loop irrigation control system includes the moisture measurement in roots zone and the control of the irrigation valves in order to maintain the moisture level around a set value. The controller determines when and how much to irrigate as a function of the current difference between soil moisture measurements and the reference values. The system is used in three irrigation treatments with different set-point moisture level: T1: soil moisture at field capacity; T2: water deficit level from pit hardening to harvest (40% of field capacity); and T3: water deficit level from fruit set to harvest (40% of field capacity). Experiences were carried out in a four-year-old experimental olive orchard grown 'Arbequina', located in San Juan, Argentina. Controller was able to maintain soil moisture values around the reference value, fact that allow performing different irrigation strategies. Productive and qualitative parameters were affected by applying water deficit treatments in different phenological moments, being specially affected the obtained oil quality.

Scientia Horticulturae, 2013

ABSTRACT Evolution in the contents of carbohydrates and organic acids of Berberis buxifolia fruit... more ABSTRACT Evolution in the contents of carbohydrates and organic acids of Berberis buxifolia fruits during the growth and ripening in different growing seasons (2004/05, 2005/06 and 2007/08), and their correlations with physicochemical variables are presented. Glucose and fructose contents increased during the fruiting period reaching maximum values between 98 and 126 days from full flower phase (DFFP). Insoluble and soluble dietary fiber contents attained maximum values between 56 and 70 DFFP, to then decrease toward the end of ripening, although soluble dietary fiber during 2005/06 presented a peak later. Citric and malic acid contents increased during the fruiting period being maximum between 56 and 70 DFFP, to then decrease toward the end of ripening, although citric acid content during 2007/08 stayed constant from 70 DFFP. Oxalic and tartaric acid contents were maximal between 42 and 70 DFFP; to then decrease toward the end of the fruiting period. According to the obtained results, B. buxifolia fruits can be considered as fruits rich in carbohydrates. Contents of carbohydrates and organic acids during the fruit growth and ripening varied with the specific compound or group considered, i.e., soluble sugars, fibers or organic acid type and might correlate with features of quality of fruit including weight, firmness and color, soluble solids and total titratable acidity, which are responsible for the astringency, texture, taste and color of the fruits.

Phytochemistry, 1992

ABSTRACT The activities of γ-glutamyl transpeptidase/γ-glutamyl peptidase enzymes have been measu... more ABSTRACT The activities of γ-glutamyl transpeptidase/γ-glutamyl peptidase enzymes have been measured in sprouted garlic bulbs (Allium sativum cv Red). Effects of γ-glutamyl p-nitroanilide concentration, enzyme concentration, temperature and time of incubation on enzyme activity, and distribution of this activity between sprouts and storage leaves of sprouted garlic cloves were determined.

Journal of the Science of Food and Agriculture, 2008

Journal of the Science of Food and Agriculture, 1992

ABSTRACT The effects of 50 Gy γ-irradiation 30 days after harvest on γ-glutamyl transpeptidase (G... more ABSTRACT The effects of 50 Gy γ-irradiation 30 days after harvest on γ-glutamyl transpeptidase (GTP) activity (the first enzyme in the catabolism of γ-glutamyl peptides) of garlic bulbs cv ‘Red’ during storage for 300 days were evaluated. GTP activity was determined by spectrophotometry using γ-glutamyl-p-nitroanilide as exogenous substrate, and was correlated with parameters related to the metabolic-respiratory activity, such as sprouting index in control bulbs, and cumulative weight losses (CWL) and non-enzymic or control pyruvate (CP; metabolite of the respiratory chain) in irradiated and control bulbs. GTP activity was also correlated with flavour parameters, such as enzymic pyruvate (EP; metabolite of the reaction of alliinase and sulphur amino acids in crushed garlic) and primary sulphur compounds. From these results, three storage stages are suggested: (i) the internal dormancy period, (ii) the first post-dormant stage, and (iii) the second post-dormant stage. During the first 90 days of storage (first stage) all the parameters remained nearly constant in the controls, while GTP activity and CP content increased in irradiated garlic because of radioinduced metabolic-respiratory activation. From 90 to 180 days of storage (second stage) the correlation between the increases of GTP and EP in irradiated garlic and controls was due to the action of GTP on γ-glutamyl peptides that finally released substrates of alliinase. Both enzymes increased EP contact, which was higher in irradiated garlic (major flavour enhancement) than in controls. After 180 days of storage (third stage) EP and primary sulphur compounds decreased in irradiated garlic and in the controls, while GTP, CWL and CP kept increasing in both samples with lower rates of increase in irradiated garlic. These increases were related to metabolic activation, reserve exhaustion and finally rotting. Therefore, irradiated garlic was of better quality at the end of storage.

Chemistry and Engineering Applications, 2010

Journal of Food Processing and Preservation, 2002

Journal of Food Process Engineering, 2000

ABSTRACT The immobilization of commercial pectinases by physical adsorption on hollow fiber ultra... more ABSTRACT The immobilization of commercial pectinases by physical adsorption on hollow fiber ultrafiltration (HFUF) membranes was studied in view of its possible application in fruit juice clarification. The optimal pH during immobilization and washing was investigated, as well as the effects of enzyme and pectin concentrations and retentate flow on the operation. Results indicated that permeate flux was not initially increased when pectin solution or apple juice was ultrafiltred through pectinase immobilized on HFUF membranes. However, enzyme immobilization greatly extended the membrane operation, by keeping permeate flux constant during prolonged periods at a reasonable yield.

Journal of the American Oil Chemists' Society, 2007

Food Chemistry, 2004

... SEM studies also revealed that after pasteurising apple juice (90 °C, 5 min) virtually all th... more ... SEM studies also revealed that after pasteurising apple juice (90 °C, 5 min) virtually all the starch granules lost their spherical structure and only gel-like starch fragments dispersed among the other components of haze (pectin, cell wall, etc.) were observed. ...

European Journal of Lipid Science and Technology, 2012