不同品种红枣冻干片的理化品质及抗氧化性比较

Comparison of Physic-chemistry Qualities and Antioxidant Activity of Frozen Slices of Different Jujube Varieties

为比较不同品种红枣冻干片的理化品质及抗氧化能力,分析7个品种红枣冻干片的总酸、糖、VC、环磷酸腺苷(adenosine cyclic 3,5-monophosphate,cAMP)、游离氨基酸、总酚、总黄酮、DPPH自由基清除能力、ABTS+自由基清除能力,利用Unscramble10.1软件对数据进行主成分分析。结果表明,不同红枣品种的理化品质及抗氧化能力差异显著(p<0.05),其中骏枣的总酸、总酚、总游离氨基酸和必需氨基酸含量最高,分别为13.47 mg/g DW、11.94 mg GAE/g DW、24.08 mg/g DW和4.33 mg/g DW;冬枣的果糖、葡萄糖、VC和总黄酮含量最高,分别为250.31、235.49、10.42 mg/g DW和2.57 mg RE/g DW;灰枣的蔗糖和总糖含量最高,分别为422.91、786.75 mg/g DW;骏优2号的cAMP最高(600.92μg/g DW);骏枣的抗氧化能力最强,DPPH自由基和ABTS+自由基清除力分别为25.09、63.69μmol TE/g DW。

In order to compare the physic-chemistry qualities and antioxidant activity of frozen slices of different jujube varieties,their indices,including total titratable acid,sugars,VC,cAMP,free amino acids,total phenol content,total flavonoids content,DPPH free radical scavenging activity and ABTS+free radical scavenging activity,were analyzed,and these data was further processed by principal component analysis.The results showed that there were significant differences of nutrients and antioxidant activity among these varieties(p<0.05).Among these varieties,Junzao contained the highest total acid,total phenol,total free amino acids and essential amino acids,which were 13.47 mg/g DW,11.94 mg GAE/g DW,24.08 mg/g DW and 4.33 mg/g DW respectively.Dongzao contained the highest fructose,glucose,VC and total flavonoids,which were 250.31,235.49,10.42 mg/g DW and 2.57 mg RE/g DW,while Huizao contained the highest sucrose and total sugar,which were 422.91 mg/g DW and 786.75 mg/g DW,respectively.Junyou 2 had the highest content of cAMP,which reached to 600.92μg/g DW.Junzao had the strongest antioxidant capacity,and the radical scavenging abilities of DPPH and ABTS+were 25.09μmol TE/g DW and 63.69μmol TE/g DW,respectively.