Effect of purslane (Portulaca oleracea L.) extract on anti-browning of fresh-cut potato slices during storage. (15th June 2019)

• Record Type: Journal Article
• Authors: Liu, Xia; Yang, Qian; Lu, Yuzhu; Li, Yuan; Li, Tongtong; Zhou, Boyang; Qiao, Liping
• Is Part Of: Food chemistry. Volume 283(2019)
• Page Start: 445
• Page End: 453
• Publication Date: 2019-06-15
• Subjects: PPO polyphenol oxidase -- POD peroxidase -- PAL phenylalamine ammonia lyase -- MDA malondialdehyde -- LC-MS/MS high-performance liquid chromatography–tandem mass spectrometry; Purslane aqueous extract -- Enzymatic browning -- Fresh-cut potato; Food -- Analysis -- Periodicals; Food -- Composition -- Periodicals; 664
• DOI: 10.1016/j.foodchem.2019.01.058
• Languages: English
• ISSNs: 0308-8146

Abstract

Highlights: Purslane extract greatly inhibited fresh-cut potato browning during 4 °C storage. Purslane extract significantly suppressed the activities of PPO, POD and PAL. Purslane extract could retain the membrane permeability, MDA content. Medium concentration of purslane extract inhibited browning. Abstract: Enzymatic browning is a crucial reaction affecting the quality of fresh-cut fruit and vegetables. Purslane is an edible Chinese folk medicine with extensive distribution and containing a lot of polyphenols and alkaloids. However, little research on its' anti-browning effect on fresh-cut food was reported. In this study, the effectiveness of 0.05% (w/w) purslane aqueous extract treatment efficiently inhibited the activities of polyphenol oxidase (PPO), peroxidase (POD) and phenylalanine ammonia-lyase (PAL), the membrane integrity was effectively maintained, and malondialdehyde (MDA) content increases was retarded during whole storage period at 4 °C. Oddly, the higher purslane extract concentration, the lower endogenesis phenolic content. Additionally, thirty polyphenols and fifty-six alkaloids were found in purslane aqueous extract by LC-MS/MS. All results suggest that purslane aqueous extract is a promising nutritive anti-browning agent for fresh-cut potato.