Impact of pulsed light treatment on quality characteristics and oxidative sta...ljmonking
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The study investigates the effects of pulsed light (PL) treatments on fresh-cut avocados regarding microbial stability, color retention, and lipid oxidation over 15 days of refrigerated storage. Higher PL doses effectively reduced microbial counts and maintained better color and chlorophyll retention compared to untreated avocados, while also preventing rancidity and oxidative deterioration of lipids. The findings suggest that PL treatments could enhance the shelf life and quality of fresh-cut avocados without compromising their nutritional value.
Stability of avocado paste carotenoids as affected by high hydrostatic pressu...ljmonking
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High hydrostatic pressure (HHP) processing is an effective non-thermal method for stabilizing avocado paste carotenoids, resulting in a significant initial increase in total carotenoid concentrations, though levels decline during storage. The study found that while carotenoids contribute minimally to the antioxidant capacity, HHP processed avocado paste retains nutritional value even after 40 days of refrigerated storage. This research highlights the importance of HHP technology for the avocado industry and its potential health benefits.
INVESTIGATION ON ISOLATED AND PURIFIED LIPOXYGENASE FROM AVOCADO IN THE PRESE...ljmonking
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This document describes research on isolating and characterizing lipoxygenase (LOX) enzyme from avocado. Key points:
- LOX was isolated from avocado through a multi-step purification process involving acetone extraction, pH adjustment, salt precipitation, and ultracentrifugation.
- The purified LOX's activity was tested using linolenic acid as a substrate. Its optimum pH was found to be 6.5 and optimum temperature was 40属C.
- Kinetic parameters Km and Vmax for LOX were determined using the Lineweaver-Burk method with varying linolenic acid concentrations. Characterization of avocado LOX could help minimize its detrimental effects on
This document discusses how high pressure processing (HPP) can be used to preserve guacamole and avocado products. HPP uses high water pressure (typically 600 MPa for 3 minutes) to inactivate microorganisms without affecting nutritional quality or sensory attributes. HPP allows for longer shelf life by controlling spoilage bacteria and pathogens. It also partially inactivates enzymes responsible for browning and off-flavors. Proper refrigerated storage after HPP is necessary to minimize quality changes from residual enzyme activity over time.
De thi va bai giai olympic toan (1993 2005)ljmonking
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This document provides sample questions and solutions from the Vietnamese National Olympiad in Mathematics competitions from 1993 to 2005. It contains 3 or fewer sentences summarizing each section:
The first section presents problems and solutions from the 1993 competition, including problems on systems of linear equations and inequalities, properties of quadratic functions, and factorization of polynomials. The second section covers problems on linear systems, quadratic functions, and properties of trigonometric functions from the 1994 competition. The third section discusses problems involving linear systems, properties of quadratic functions, and factorization from the 1995 competition.
HHP processing of avocado paste at 600 MPa for 3 minutes significantly increased total extractable carotenoid levels by about 56%. During storage of the processed paste for 40 days at 4属C, carotenoid levels declined but remained higher than in unprocessed paste. ORAC values, a measure of antioxidant capacity, decreased after processing but increased during storage, indicating carotenoids contribute minimally to total antioxidant capacity. The study showed HHP processing and refrigerated storage retained avocado carotenoids and bioactive compounds within the product's sensory shelf life.
Studies on certain quality attributes of meat pickle prepared from spent chickenljmonking
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This document summarizes a study on the quality attributes of meat pickle prepared from spent chicken meat. Spent chicken meat was marinated, pressure cooked, fried with spices, and packed in jars. The pickle was analyzed over 90 days of storage at room temperature. Key findings:
1) The pickle had 61.89% moisture, 17.28% protein, 14.65% fat, and 3.35% ash. pH and mold counts did not differ significantly during storage but TBA values and bacterial counts increased significantly over time.
2) Sensory analysis found decreasing scores for color, flavor, and overall acceptance during storage, though texture and juiciness did not differ significantly.
3) The
This document provides information on passion fruit, including its origin, description, cultivation requirements, propagation methods, pests and diseases, harvesting, and popular cultivars. It describes passion fruit as a climbing vine native to South America that produces oval or round fruits containing pulp and seeds. The document outlines ideal growing conditions for passion fruit such as full sun, well-draining soil, regular watering and fertilizing, and protection from frost. It also discusses pruning, propagation from seed or cuttings, and common pests and diseases afflicting passion fruit vines.
This document summarizes a study that investigated the use of atmospheric cold plasma to decontaminate radicchio (red chicory) leaves. The researchers treated radicchio leaves with cold plasma for 15 or 30 minutes. They then analyzed the effects on microbial reduction, antioxidant activity, and quality attributes over several days of storage. They found that a 15-minute treatment significantly reduced E. coli levels, while a 30-minute treatment was needed to significantly reduce L. monocytogenes. The antioxidant activity and quality of the radicchio were maintained after cold plasma treatment. The study suggests cold plasma may be a promising non-thermal method for decontaminating leafy vegetables while preserving quality and nutritional properties.
Studies on certain quality attributes of meat pickle prepared from spent chickenljmonking
油
This document summarizes a study on the quality attributes of meat pickle prepared from spent chicken meat. Spent chicken meat was marinated, pressure cooked, fried with spices, and packed in jars. The pickle was analyzed over 90 days of storage at room temperature. Key findings:
1) The pickle had 61.89% moisture, 17.28% protein, 14.65% fat, and 3.35% ash. pH and mold counts did not differ significantly during storage but TBA values and bacterial counts increased significantly over time.
2) Sensory analysis found decreasing scores for color, flavor, and overall acceptance during storage, though texture and juiciness did not differ significantly.
3) The
This document provides information on passion fruit, including its origin, description, cultivation requirements, propagation methods, pests and diseases, harvesting, and popular cultivars. It describes passion fruit as a climbing vine native to South America that produces oval or round fruits containing pulp and seeds. The document outlines ideal growing conditions for passion fruit such as full sun, well-draining soil, regular watering and fertilizing, and protection from frost. It also discusses pruning, propagation from seed or cuttings, and common pests and diseases afflicting passion fruit vines.
This document summarizes a study that investigated the use of atmospheric cold plasma to decontaminate radicchio (red chicory) leaves. The researchers treated radicchio leaves with cold plasma for 15 or 30 minutes. They then analyzed the effects on microbial reduction, antioxidant activity, and quality attributes over several days of storage. They found that a 15-minute treatment significantly reduced E. coli levels, while a 30-minute treatment was needed to significantly reduce L. monocytogenes. The antioxidant activity and quality of the radicchio were maintained after cold plasma treatment. The study suggests cold plasma may be a promising non-thermal method for decontaminating leafy vegetables while preserving quality and nutritional properties.