Recent Advances in Longan Polysaccharides and Polyphenols

Mao, Yuzhu; Yang, Huiying; Chen, Fu; You, Siyong; Lai, Shaojuan

doi:10.1201/9780429286476-8

Cited by 2 publications

(2 citation statements)

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“…Sweetness is an important commodity property of mature longan fruit, as its soluble solids content (SSC) usually exceeds 20% [3]. More importantly, except being used as an important specialty fruit, longan fruit has been used as traditional Chinese medicine for thousands of years, due to the abundant bioactive components (e.g., polyphenols, flavonoids, alkaloids, polysaccharides) in pericarp, pulp, and seed [4][5][6]. These components in longan showed a broad range of health effects and activities, such as anti-tumor, antioxidant, anti-αglucosidase, anti-α-amylase, and immunological activities [5,6].…”

Section: Introductionmentioning

confidence: 99%

“…More importantly, except being used as an important specialty fruit, longan fruit has been used as traditional Chinese medicine for thousands of years, due to the abundant bioactive components (e.g., polyphenols, flavonoids, alkaloids, polysaccharides) in pericarp, pulp, and seed [4][5][6]. These components in longan showed a broad range of health effects and activities, such as anti-tumor, antioxidant, anti-αglucosidase, anti-α-amylase, and immunological activities [5,6]. However, longan fruit is a perishable fruit because its deterioration, mainly characterized as pericarp browning and aril breakdown, quickly occurs within a few days under room-temperature storage [1].…”

Section: Introductionmentioning

confidence: 99%

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GA3 Treatment Delays the Deterioration of ‘Shixia’ Longan during the On-Tree Preservation and Room-Temperature Storage and Up-Regulates Antioxidants

Luo

Lin

Lai

et al. 2023

Foods

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Gibberellic acids had been proven to improve the fruit quality and storability by delaying deterioration and maintaining the antioxidant system. In this study, the effect of GA3 spraying at different concentrations (10, 20, and 50 mg L−1) on the quality of on-tree preserved ‘Shixia’ longan was examined. Only 50 mg L−1 GA3 significantly delayed the decline of soluble solids (22.0% higher than the control) and resulted in higher total phenolics content (TPC), total flavonoid content (TFC), and phenylalanine ammonia-lyase activity in pulp at the later stages. The widely targeted metabolome analysis showed that the treatment reprogrammed secondary metabolites and up-regulated many tannins, phenolic acids, and lignans during the on-tree preservation. More importantly, the preharvest 50 mg L−1 GA3 spraying (at 85 and 95 days after flowering) led to significantly delayed pericarp browning and aril breakdown, as well as lower pericarp relative conductivity and mass loss at the later stages of room-temperature storage. The treatment also resulted in higher antioxidants in pulp (vitamin C, phenolics, and reduced glutathione) and pericarp (vitamin C, flavonoids, and phenolics). Therefore, preharvest 50 mg L−1 GA3 spraying is an effective method for maintaining the quality and up-regulating antioxidants of longan fruit during both on-tree preservation and room-temperature storage.

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