Showing papers by "Adel A. Kader published in 2000"
TL;DR: The content of vitamin C in fruits and vegetables can be influenced by various factors such as genotypic differences, pre-harvest climatic conditions and cultural practices, maturity and harvesting methods, and postharvest handling procedures.
2,153 citations
TL;DR: HPLC-DAD and HPLC-MS analyses of the juices revealed that commercial juices contained the pomegranate tannin punicalagin while only traces of this compound were detected in the experimental juice obtained from arils in the laboratory, which shows that pomesgranate industrial processing extracts some of the hydrolyzable tannins present in the fruit rind.
Abstract: The antioxidant activity of pomegranate juices was evaluated by four different methods (ABTS, DPPH, DMPD, and FRAP) and compared to those of red wine and a green tea infusion. Commercial pomegranate juices showed an antioxidant activity (18-20 TEAC) three times higher than those of red wine and green tea (6-8 TEAC). The activity was higher in commercial juices extracted from whole pomegranates than in experimental juices obtained from the arils only (12-14 TEAC). HPLC-DAD and HPLC-MS analyses of the juices revealed that commercial juices contained the pomegranate tannin punicalagin (1500-1900 mg/L) while only traces of this compound were detected in the experimental juice obtained from arils in the laboratory. This shows that pomegranate industrial processing extracts some of the hydrolyzable tannins present in the fruit rind. This could account for the higher antioxidant activity of commercial juices compared to the experimental ones. In addition, anthocyanins, ellagic acid derivatives, and hydrolyzable tannins were detected and quantified in the pomegranate juices.
2,139 citations
TL;DR: In some plant organs, cyanide-resistant respiration is enhanced by elevated O 2 atmospheres as mentioned in this paper, which may stimulate, have no effect, or reduce rates of respiration and ethylene production, depending on commodity, maturity and ripeness stage, O 2 concentration, storage time and temperature, and concentrations of CO 2 and C 2 H 4 present in the atmosphere.
281 citations
TL;DR: In this paper, the authors found that pears derived from smaller size fruit (122 to 135 g) have greater cut surface discoloration and deteriorate more rapidly than slices derived from larger fruit (152 g), and pears held at -1 °C in a controlled atmosphere of 2%O 2 + 98%N 2 had a longer post-cutting shelf life than those held in air at - 1 °C for the same duration.
Abstract: Fresh-cut fruit slices prepared from partially ripened Bartlett pears had longer shelf life than those from Bosc, Anjou, and Red Anjou pears. Pear fruit ripeness, based on flesh firmness of 44 to 58 N, is optimal for fresh-cut pear slice processing. Pear slices derived from smaller size fruit (122 to 135 g) have greater cut surface discoloration and deteriorate more rapidly than slices derived from larger fruit (152 g). Recently harvested Bartlett pear fruit and whole pears held at -1 °C in a controlled atmosphere of 2%O 2 + 98%N 2 had a longer post-cutting shelf life than those held in air at -1 °C for the same duration. Cut surface browning, flesh softening, and surface dehydration of the slice cut surface were all contributors to loss of product quality.
138 citations
TL;DR: The workshop on Modified Atmosphere Packaging— Toward 2000 and Beyond is introduced by reviewing the current status of MAP technology for fresh and minimally processed products, highlighting research needs and future advances, and providing a list of selected references on MAP published since 1989.
Abstract: Rapid expansion of modified atmosphere packaging (MAP) for horticultural produce has occurred during the last 10 years, especially for fresh cut (minimally processed) products, but limitations to further expansion reside in both responses of products and available technology. We introduce the workshop on Modified Atmosphere Packaging— Toward 2000 and Beyond by reviewing the current status of MAP technology for fresh and minimally processed products, highlighting research needs and future advances, and providing a list of selected references on MAP published since 1989.
124 citations
12 citations