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罗汉果叶黄酮抗氧化能力研究   总被引:13,自引:0,他引:13  
采用磷钼络合物法研究了罗汉果叶总黄酮提取物的抗氧化能力。结果表明,该提取物具有很强的抗氧化活性,其抗氧化活性优于人工合成抗氧化剂BHT,是一种值得进一步开发利用的天然抗氧化剂。  相似文献
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ABTS法体外测定果蔬类总抗氧化能力的研究进展   总被引:11,自引:1,他引:10  
ABTS法作为一种用于体外测定物质总抗氧化能力的新方法,在国内报道甚少,文中就该方法在国外的发展、在果蔬中的应用以及存在的问题进行了概述和分析,为该方法在国内的应用提供理论依据。  相似文献
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食品类黑精的研究进展   总被引:11,自引:0,他引:11  
类黑精是美拉德反应后期形成的一类棕褐色的、结构复杂的大分子化合物,在食品中普遍存在。大量的研究显示,食品类黑精具有明显的抗氧化、抗诱变、抗癌、抗菌以及结合风味物质等功能。本文就近年来国内外有关食品类黑精的研究成果作一简单介绍。  相似文献
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Antioxidant capacity for a wide range of natural or synthetic polyphenolics was comprehensively evaluated by vitamin C equivalent antioxidant capacity (VCEAC) assay using free blue/green ABTS radicals. The polyphenolics tested are grouped into the following categories: vitamins (beta-carotene, alpha-tocopherol, vitamin A, and vitamin C), phenolic acids (benzoic acid, phenylacetic acid, cinnamic acid, and their derivatives), flavonoids (anthocyanidin, flavanol, chalcone, flavanone, flavone, flavonol, isoflavone, and their derivatives), synthetic food additives (BHA, BHT, TBHQ, and PG), and other miscellaneous polyphenolics (ellagic acid, sesamol, eugenol, thymol, etc.). A positive linear relationship between VCEAC and the number of free OH groups around the flavonoid framework was found, whereas, for phenolic acids, the linear relationship was not as good as with the flavonoid aglycones. Groups of chemicals having comparable structures generally showed similar trends. Polyphenolics commonly showed a higher VCEAC compared to monophenolics. Compounds like gallic acid with 3 vicinal hydroxy substitutions on the aromatic ring in phenolic acids or like epigallocatechin with 3 vicinal hydroxy substitutions on the B ring in flavonoids showed the highest antioxidant capcity among the groups. In the flavonoids, 2 characteristic chemical structures were very important, the catechol moiety in the B ring and the 3-OH functional group in a chroman ring. Glycosylated flavonoids showed less potent antioxidant capacity than their aglycone alone. Synthetic antioxidant food additives (BHA, TBHQ, and BHT) conventionally used in the food industry were less effective antioxidants than ascorbic acid. Other naturally occurring polyphenolics tested followed the expected general trends of phenolic acids and flavonoids.  相似文献
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DPPH自由基比色法测定番石榴叶提取物抗氧化活性的研究   总被引:9,自引:1,他引:8  
本文用2,2-联苯-1-三硝基苯肼(DPPH·)比色法测定了番石榴叶(PsidiumguajavaL.)的抗氧化活性,并使用了三个不同参数抑制率、EC50和AE来评价其抗氧化活性。结果表明,浓度越高,番石榴叶提取物清除自由基的能力越强,其中AE是表示抗氧化活性的最有效的能数。本研究表明番石榴叶提取物是一种有效的、有开发价值的天然抗氧化剂。  相似文献
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两种方法测定坚果类食物抗氧化活性的比较   总被引:8,自引:0,他引:8       下载免费PDF全文
为比较FRAP(ferricreducing antioxidantpower)法和ORAC(oxygenradicalabsorbancecapacity)法测定抗氧化活性的异同 ,用这两种方法测定了 9种坚果类食物的抗氧化活性。FRAP法测定结果显示 ,9种坚果类食物的还原活性排序为葵花子 >核桃 >花生 >白果 >栗子 >莲子 >榛子 >松子 >南瓜子 ,最强与最弱相差 6 81 4倍 ;ORAC法测定结果与FRAP法测定结果高度相关 (r =0 975 4,P <0 0 1) ,但是 ,食物的抗氧化活性排序有所差异 ,最强与最弱仅相差 9 2倍。进行抗氧化研究时应注意两种方法的差异。  相似文献
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Polyphenolic compounds and antioxidant properties of selected China wines   总被引:7,自引:0,他引:7  
Thirty-seven China wines, produced from different geographical origins, were examined in this study. The antioxidant activity of wines was measured by different analytical methods: oxygen radical absorbance capacity (ORAC), reducing power, 2,2-azino-di-(3-ethylbenzothialozine-sulphonic acid) (ABTS), 2,2-diphenyl-1-picrylhydrazyl (DPPH·), hydroxyl radical-scavenger activity, superoxide radical-scavenger activity, lipid peroxidation and chelating capacity. Furthermore,total phenols, total flavonoids, total flavanols and total anthocyanins of wines were determined. As expected, the red wines had much higher phenolic content and antioxidant capacity than rosé wines or white wines. Among the red wines, Cabernet Sauvignon and Muscat Hamburg, respectively, represented the wines with the highest and lowest phenolic contents and antioxidant capacity. Among the white wines, Italian Riesling had the lowest phenolic content and antioxidant capacity. Taken together, a close relationship between phenolic contents and antioxidant capacity, for all wines, was observed.  相似文献
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Temperature, pH, and oxygenation of extracted blueberries were examined to determine how processing may affect the antioxidant capacity of blueberry food products. Extraction of fruit at 60 °C resulted in higher recovery of anthocyanins and antioxidant capacity, compared to extracts obtained at 25 °C. Subsequent room temperature storage resulted in losses in anthocyanins and antioxidant capacity only in those extracts obtained at 60 °C. Antioxidant capacity was greatest in pH 1 extracts, compared to extracts at pH 4 and 7. Oxygenation was detrimental to both anthocyanins and antioxidant capacity. Antioxidant capacity of processed products was positively correlated with anthocyanin (R = 0.92) and phenolic content (R = 0.95), and negatively correlated with % polymeric color (R = -0.64). In general, products that had experienced less processing had a higher antioxidant capacity. Simple colorimetric tests for anthocyanins and phenolics proved to be useful indicators of antioxidant capacity in processed products.  相似文献
10.
葛根素对糖尿病大鼠血糖和抗氧化能力的影响   总被引:6,自引:2,他引:4  
龚志刚  胡红霞  朱笃  张媛 《食品科学》2006,27(11):498-501
探讨补充葛根素对链脲佐菌素(STZ)诱导的糖尿病(DM)大鼠机体血糖和抗氧化能力的影响,结果表明:DM对照组血糖值与MDA明显提高,T-AOC、SOD、GSH、GSH-PX、CAT显著下降;DM补充组血糖与MDA明显降低,T-AOC、SOD、GSH、GSH-PX、CAT显著上升.补充葛根素能降低糖尿病大鼠血糖,提高胰岛素含量,显著增强大鼠机体抗氧化功能.  相似文献
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