6种东北地区红树莓果渣提取物的抗氧化活性差异

以东北地区6种红树莓果实加工后的果渣提取物为实验材料,研究其总酚、总黄酮、原花青素、花色苷含量和体外抗氧化活性的差异。结果表明:宝石红果渣提取物中总酚、总黄酮和原花青素含量最高,分别为14.18、3.71、15.28 mg/g;哈瑞太兹果渣提取物中花色苷含量最高,为0.68 mg/g;菲尔杜德和野生果果渣提取物的总还原能力与VC接近;除哈瑞太兹外,其他品种红树莓果渣提取物对(1,1-二苯基-2-三硝基苯肼(1,1-diphenyl-2-picrylhydrazyl,DPPH)自由基和2,2’-二氮-双(3-乙基苯并噻唑-6-磺酸)二铵盐自由基(2,2’-azino-bis(3-ethylbenzthiazoline-6-sulfonic acid)radical,ABTS~+·)的清除率均大于VC。相关性分析结果表明红树莓果渣提取物的总还原能力与总黄酮、原花青素含量的相关性较大;对DPPH自由基的清除率与原花青素、花色苷含量的相关性较大;而对ABTS~+·的清除率与总酚和总黄酮含量的相关性较大。在6个红树莓品种中,菲尔杜德和野生果果渣提取物具有较强的抗氧化活性。

Antioxidant Capacities of Six Varieties of Red Raspberry Pomace Extracts in Northeast China

The antioxidant capacities of ethanolic extracts from six different varieties of red raspberry pomace in Northeast
China were evaluated. Results showed that the highest contents of total phenols, flavonoids and proanthocyanidins were
determined in red raspberry pomace extracts from the U.S. Raspberry variety, which were up to 14.18, 3.71, and 15.28 mg/g,
respectively. The highest content (0.68 mg/g) of anthocyanins was detected in Heritage red raspberry pomace extracts.
The total reducing capacities of pomace extracts from the Fertod Zamatos variety and wild red raspberry were close to that
of VC. Pomace extracts from all varieties except Heritage had stronger scavenging capacities against DPPH and ABTS+
radicals than VC. The results of correlation analysis showed that there were significant correlations between the contents of
flavonoids or proanthocyanidins and total reducing capacity, between the contents of proanthocyanidins or anthocyanins and
DPPH scavenging capacity, and between the contents of total phenols or flavonoids and ABTS+ radical scavenging capacity
in red raspberry pomace extracts. The results of this study implied that red raspberry pomace extracts from the Fertod
Zamatos variety and wild red raspberry have stronger antioxidant activities.