scholarly journals Effects of polysaccharide-based coatings on postharvest storage life of grape: measuring the changes in nutritional, antioxidant and phenolic compounds

2022 ◽  
Author(s):  
Sara Eshghi ◽  
Rouhollah Karimi ◽  
Azam Shiri ◽  
Mostafa Karami ◽  
Mohammad Moradi
Keyword(s):  
Phenolic Compounds ◽  
Storage Life ◽  
Postharvest Storage

scholarly journals UVC light modulates vitamin C and phenolic biosynthesis in acerola fruit: role of increased mitochondria activity and ROS production

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Marcela Cristina Rabelo ◽  
Woo Young Bang ◽  
Vimal Nair ◽  
Ricardo Elesbao Alves ◽  
Daniel A. Jacobo-Velázquez ◽  
...  
Keyword(s):  
Phenolic Compounds ◽  
Vitamin C ◽  
Antioxidant Systems ◽  
Mitochondrial Activity ◽  
Postharvest Storage ◽  
Beneficial Effects ◽  
Transport Chain ◽  
Key Enzyme ◽  
Ultraviolet C

AbstractThe effects of ultraviolet-C light (UVC) on vitamin C and phenolic compounds in acerola during postharvest storage were investigated in order to elucidate the mechanism inducing the antioxidant systems. The fruits, stored at 10 °C for 7 days after a hormetic UVC irradiation (two pulses of 0.3 J/cm2), showed significantly less degradation of vitamin C and phenolic compounds than the control without the UVC challenge. UVC activated the L-galactono-1,4-lactone dehydrogenase (GalDH), a key enzyme for vitamin C biosynthesis, and altered the composition of phenolic compounds, through phenolic biosynthesis, in acerola during postharvest storage. UVC also induced reactive oxygen species (ROS) productions at immediate (day 0) and late (day 7) times during postharvest storage through the mitochondrial electron transport chain and NADPH oxidase, respectively. Results suggest that UVC helps in the retention of vitamin C and phenolic content in acerola by altering ascorbic acid and phenolic metabolism through an increase in mitochondrial activity and a ROS-mediated mechanism. Data showed the beneficial effects of UVC on maintenance of nutraceutical quality in acerola during postharvest storage and supplied new insights into understanding the mechanism by which UVC irradiation enhance the antioxidant system in fruits.

scholarly journals Influences of Organic Fertilization, High Tunnel Environment, and Postharvest Storage on Phenolic Compounds in Lettuce

HortScience ◽  
2007 ◽  
Vol 42 (1) ◽  
pp. 71-76 ◽  
Author(s):  
Xin Zhao ◽  
Edward E. Carey ◽  
Janice E. Young ◽  
Weiqun Wang ◽  
Takeo Iwamoto
Keyword(s):  
Phenolic Compounds ◽  
Open Field ◽  
High Performance ◽  
Production Management ◽  
Total Phenolics ◽  
Organic Fertilization ◽  
Postharvest Storage ◽  
High Tunnel ◽  
Phenolic Constituents ◽  
The Impact

As the largest group of phytochemicals, dietary phenolics play an important role in human health and disease prevention. Cultural practices have been shown to have the potential for affecting phenolic compounds in food crops. Spring and summer trials were conducted in 2003 to examine the effects of organic fertilization and high tunnel environments on phenolic constituents of lettuce (Lactuca sativa L.) cultivars Red Sails and Kalura. Effects of postharvest storage at 4 °C for 16 days on total phenolics of lettuce harvested from the summer trial were also evaluated. Total phenolics, excluding anthocyanins, were measured spectrophotometrically, and major phenolic constituents were identified and quantified by high-performance liquid chromatography. Chlorogenic acid and quercetin glycosides were found to be predominant in lettuce. ‘Red Sails’ consistently exhibited significantly higher phenolic concentrations than ‘Kalura’. Organic (compost + fish emulsion) and conventional (N–P–K + CaNO3) fertilization did not consistently differentially affect lettuce phenolics in our recently established organic and conventional plots. The high tunnel environment generally reduced phenolic levels in lettuce relative to the open field. However, differences between high tunnel and open field varied with cultivar and season. Effects of production factors on lettuce phenolics were maintained during cold storage. There was a substantial increase in total phenolics during storage, likely correlated with declining lettuce quality. Further studies are warranted to more fully assess the impact of cultivar and production management, including organic fertilization, on lettuce phenolics.

scholarly journals Physiological Changes of Broccoli during Early Postharvest Senescence and through the Preharvest-Postharvest Continuum

1994 ◽  
Vol 119 (2) ◽  
pp. 270-275 ◽  
Author(s):  
Graeme A. King ◽  
Stephen C. Morris
Keyword(s):  
Carbon Dioxide ◽  
Brassica Oleracea ◽  
Oxidative Metabolism ◽  
Ethylene Production ◽  
Respiratory Quotient ◽  
Storage Life ◽  
Model Systems ◽  
Physiological Changes ◽  
Postharvest Storage ◽  
Postharvest Senescence

The postharvest senescence of broccoli (Brassica oleracea L. Italica group) was studied immediately after harvest until senescence was essentially completed at 20C. Changes in respiration, ethylene production, and color were determined for florets, branchlets, and heads of three cultivars of field-harvested `Green Beauty', `Dominator', and `Shogun' broccoli. Changes in respiration and ethylene production were also determined for 3 hours of preharvest and 24 hours of postharvest storage using broccoli grown in containers. Carbon dioxide produced from heads of container-grown broccoli and from heads, branchlets, and florets of field-harvested broccoli decreased markedly during the first 12 hours of postharvest storage before stabilizing. The respiratory quotient shifted toward a more oxidative metabolism in parallel with the respiratory decline. Ethylene production during storage showed no consistent relationship to yellowing. However, time until onset of yellowing was broadly related to the basal levels of ethylene production. The maximum storage life at 20C is ≈72 hours. Branchlets are useful model systems for investigating broccoli senescence.

Evaluation of wax to extend the postharvest storage life of honeydew melons (Cucumis melo L. var. inodorus Naud

1994 ◽  
Vol 34 (3) ◽  
pp. 427 ◽  
Author(s):  
M Edwards ◽  
R Blennerhassett
Keyword(s):  
Weight Loss ◽  
Water Loss ◽  
Low Temperatures ◽  
Cucumis Melo ◽  
Chilling Injury ◽  
Storage Life ◽  
Fusarium Spp ◽  
Postharvest Storage ◽  
Cucumis Melo L ◽  
Reduce Water Loss

This experiment evaluated Citruseal wax at 50 and 80% (v/v wax/water) for effects on storage life on Honeydew melons (Cucumis melo L. var. inodorus). Waxing reduced weight loss after 4 and 6 weeks storage at 3�C and 6�C and chilling injury at 3�C. Waxing did not reduce breakdown caused by bacteria or fungi (largely Alternaria and Fusarium spp.) at 3�C. These results indicate that diluted Citruseal wax can be used to reduce water loss and chilling injury at low temperatures.

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