'Gola' litchi fruits were stored under ten different CA-combinations at 5±1°C to investigate its effects on pericarp browning, biochemical quality and antioxidative activities. Control fruit turned completely brown after 28days of storage and were excluded from the study. Fruit-stored under CA7-combination (1% O2+5% CO2) showed reduced weight loss, pericarp browning, membrane leakage and malondialdehyde contents. Soluble solid contents, titratable acidity and ascorbic acid contents were higher in CA7-stored fruit. Activities of catalase and superoxide dismutase enzymes, levels of total anthocyanins, DPPH radical-scavenging-activity and phenolic contents were significantly higher in CA7-stored litchi fruit. In contrast, activities of polyphenol oxidase and peroxidase enzymes were substantially lower in fruit kept under CA7-combination. Fruit subjected to CA7-conditions also maintained higher organoleptic quality. In conclusion, 1% O2+5% CO2 CA-conditions delayed pericarp browning, maintained antioxidative activities and biochemical characteristics along with better organoleptic quality of litchi fruit for 35days.
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http://dx.doi.org/10.1016/j.foodchem.2016.03.021 | DOI Listing |
Food Technol Biotechnol
December 2024
Department of Food Technology, Faculty of Food Science and Technology, Jalan Universiti 1, 43400, Universiti Putra Malaysia, Selangor, Malaysia.
Research Background: Anthocyanin pigments in mangosteen pericarp can serve as natural colourants; however, their stability is compromised by enzymatic browning caused by polyphenol oxidase (PPO). Thus, this study aims to investigate how hot water and steam blanching affect the PPO activity, phenolic profile and antioxidant properties of mangosteen pericarp.
Experimental Approach: Fresh mangosteen pericarp was blanched in hot water or steam at 100 °C for 0, 30, 60, 90 and 120 s and the residual PPO activity, total phenolic content (TPC), total anthocyanins, antioxidant activity, browning index and colour properties were evaluated.
Foods
January 2025
Guangdong Provincial Key Laboratory of Food Quality and Safety, College of Food Science, South China Agricultural University, Guangzhou 510641, China.
Chlorine dioxide (ClO) gas has attracted considerable attention due to its safety and efficiency. In this study, we successfully developed a color-variable ClO slow-releasing card for postharvest litchi. The optimal ClO slow-releasing card was prepared as follows: Card A was soaked in 2.
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November 2024
Sericultural & Agri-Food Research Institute Guangdong Academy of Agricultural Sciences, Key Laboratory of Functional Foods, Ministry of Agriculture, Guangdong Key Laboratory of Agricultural Products Processing, Guangzhou, Guangdong 510610, China. Electronic address:
Litchi is popular among consumers due to its delicious taste, however, the extremely short shelf life limits its commercial value. Few studies have been conducted to develop new technologies to extend the shelf life of litchi. Therefore, this study applied a novel technique (low voltage electrostatic field, LVEF) combined with ice-temperature (0 °C) treatment on litchi and evaluated its quality characteristics during storage.
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February 2025
Environment and Plant Protection Institute, Chinese Academy of Tropical Agricultural Sciences, Haikou, Hainan 571101, China; National Key Laboratory for Tropical Crop Breeding, Haikou, Hainan 571101, China. Electronic address:
Postharvest pericarp browning, caused primarily by the enzymatic oxidation of phenols, reduces the shelf life and market value of litchi fruit and is considered a major limitation for the development of the litchi industry. Previous studies have shown that polyphenol oxidase (PPO) is a key enzyme and that flavonoids are important substrates for enzymatic browning; however, direct evidence is still lacking. This study investigated the differences in the browning process among the wild type (WT) and four PPO gene-edited litchi calli to verify the function of PPO in the browning of litchi tissues.
View Article and Find Full Text PDFPlants (Basel)
October 2024
Institute of Fruit Tree Research, Guangdong Academy of Agricultural Sciences, Key Laboratory of South Subtropical Fruit Biology and Genetic Resources Utilization, Ministry of Agriculture and Rural Affairs, Guangdong Key Laboratory of Fruit Science and Technology Research, Guangzhou 510640, China.
SO fumigation treatment (commonly known as sulfur treatment, ST) is a key method in the postharvest preservation of imported and exported fresh longan fruits, effectively reducing pericarp browning and enhancing color. Nonetheless, distinctive aromas, often referred to as "sulfur flavor", may develop in the aril during the extended preservation period. This study employed "Caopu" longan as the test material and patented SO-releasing paper (ZL201610227848.
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