南疆4种石榴果实品质、营养成分及抗氧化活性的比较OA

To investigate the fruit quality,nutrient composition and their in vitro antioxidant activities of different pomegranate varie-ties,four varieties of pomegranates fruit from Southern Xinjiang(soft-seeded,Piyaman,Caohu,Baixiang)were used for the determina-tion of the single fruit weight,longitudinal/transversal diameters,chromaticity,soluble solids,titratable acidity,total phenolics,total fla-vonoids,anthocyanins,and their antioxidant activities[DPPH radical,ABTS radical cation scavenging capacity and ferric ion reducing antioxidant power(FRAP)].The results showed that the soft-seeded pomegranate exhibited the highest single fruit weight(444.46 g)and fruit shape index(0.93).Its color parameters L*(61.09)and b*(28.12)were significantly higher than those of other varieties,in-dicating a bright appearance with a distinct yellow hue.The Piyaman pomegranate exhibited the highest a*(39.44),representing the best red saturation.The Caohu pomegranate had the highest soluble solids content,while the Piyaman pomegranate has the highest titratable acidity.Notably,total phenolics(6.44 mg GAE/g)and total flavonoids(2.58 mg RE/g)were the highest in Caohu,while anthocyanins was the highest in Piyaman at 0.093 mg/g.In addition,all four pomegranate varieties demonstrated strong in vitro antioxidant activity.Among them,the Caohu pomegranate showed significantly superior ABTS radical cation scavenging capacity(88.33％)and FRAP(6.56 μmol Trolox/g),which may be attributed to its higher levels of total phenolics,total flavonoids and anthocyanins.This study pro-vides a theoretical basis for the quality evaluation and development of high-value functional products of pomegranate resources in Southern Xinjiang.