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鞣花酸和石榴皮多酚提取物抗氧化活性的比较 总被引:1,自引:0,他引:1
对鞣花酸提取物(EA)和石榴皮多酚提取物(PE)的抗氧化活性进行比较研究。通过HPLC法检测EA和PE中鞣花酸的含量,Folin-酚法检测PE中总多酚含量;采用H2O2处理HepG2细胞建立细胞氧化应激损伤模型,MTT法比较不同浓度的EA和PE对HepG2细胞氧化应激损伤的保护作用;采用DPPH法、·OH清除法检测PE和EA体外抗氧化作用。结果表明:与EA相比,PE中鞣花酸含量很低,但PE和EA均以剂量依赖的方式提高氧化损伤的HepG2细胞生存率,有显著的保护作用,且在同一的浓度下,PE的保护作用显著高于EA。PE和EA对DPPH法、·OH清除法的清除率均呈剂量依赖性增强。 相似文献
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本研究旨在通过微波辅助提取法确定树莓鞣花酸的最佳提取工艺,并对其抗氧化活性进行研究。以红树莓为实验原料,使用乙醇提取溶剂,采用微波辅助溶剂法提取红树莓中鞣花酸,通过单因素试验与响应面试验优化红树莓中鞣花酸提取工艺,利用高效液相色谱(HPLC)法对鞣花酸进行分析测定,并对其抗氧化性进行研究。结果表明:响应面试验优化出最佳提取条件为:提取时间1.8 min、提取温度60 ℃、乙醇浓度50%、液料比19:1、微波功率411 W,此条件下测得鞣花酸提取量为(82.75±1.05) mg/100 g,高于传统盐酸水解法在最佳提取条件下所测树莓鞣花酸提取量。实际结果与理论预测高度吻合,因此本实验得到的最优条件准确可靠有参考应用价值。微波辅助溶剂法所得鞣花酸对羟自由基清除能力、清除DPPH自由基能力都显著高于传统盐酸水解法所得鞣花酸对羟自由基清除能力,清除DPPH自由基能力,说明微波辅助溶剂提取法,不但提取时间短暂,提取溶剂用量少,而且更好的保护了树莓鞣花酸的抗氧化活性,可为树莓鞣花酸工业生产提供一定参考。 相似文献
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采用高效液相色谱法分析鞣花酸(ellagic acid,EA)、齐墩果酸(oleanolic acid,OA)和熊果酸(ursolicacid,UA)在枣庄大青皮石榴不同部位的分布规律。结果显示,EA含量:花瓣(5.78 mg/g)>花托(5.22 mg/g)>花蕊(4.93 mg/g)>叶片(3.67 mg/g)>果皮(2.12 mg/g);UA含量:花蕊(6.22 mg/g)>花瓣(5.91 mg/g)>叶片(2.90 mg/g)>花托(1.06 mg/g)>果皮(0.33 mg/g);OA含量:花瓣(6.62 mg/g)>花蕊(4.02 mg/g)>叶片(1.41 mg/g)>花托(0.79 mg/g)>果皮(0.28 mg/g)。表明石榴的叶、果皮和花均可作为制取EA和三萜类物质的原料,2 类物质的含量在石榴花中最高,更具开发利用前景。 相似文献
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不同品种和成熟度树莓和黑莓果实的氧化和抗氧化活性比较 总被引:3,自引:0,他引:3
采用多变量分析方法探讨不同品种和成熟度对树莓和黑莓果实氧化和抗氧化活性的影响。单因素方差分析表明,“三冠王”黑莓果实的谷胱甘肽(GSH)、总酚和总黄酮含量均显著高于其他品种,且随果实成熟度的升高,总抗氧化能力下降。品种和成熟度对树莓和黑莓果实的GSH、总酚和丙二醛(MDA)含量,以及清除羟自由基( ·OH)能力的影响更为显著。主成分分析表明,相比于成熟度而言,品种对树莓的抗氧化能力影响更为显著。相关性分析和偏最小二乘回归分析表明,过氧化氢与MDA、GSH和清除超氧阴离子自由基(O2- ·)均呈正相关性,而总酚与总抗氧化能力、清除 ·OH能力、清除DPPH自由基能力呈正相关性;通径分析表明,树莓和黑莓果实的总酚含量和总黄酮对H2O2含量的直接效应最强。 相似文献
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Identification of Ellagic Acid in Blackberry Juice Sediment 总被引:2,自引:0,他引:2
Thanyaporn Siriwoharn Ronald E. Wrolstad Robert W. Durst 《Journal of food science》2005,70(3):C189-C197
ABSTRACT: The sediment in a commercial reconstituted 'Evergreen' blackberry ( Rubus laciniatus L.) juice concentrate was found to be composed of ellagic acid, protein, and other unidentified compounds. The qualitative tannin and protein-tannin haze test indicated that the sediment was predominantly tannin or protein-tannin complexes. Nitrogen determination showed the sediment to be 6.69%± 2.21% protein on a dry-weight basis. Almost all of the extractable material was identified as ellagic acid by high-performance liquid chromatography and liquid chromatography-mass spectrometry. The ellagic acid content of the wet sediment was 0.05 g/100 g, whereas it was 7.41 g/100 g in freeze-dried sediment. Tannase enzyme did not significantly decrease the concentration of ellagitannins in Marion blackberry ( Rubus spp. Hyb.) juice in this study. 相似文献
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Esra Sariburun Saliha Şahin Cevdet Demir Cihat Türkben Vildan Uylaşer 《Journal of food science》2010,75(4):C328-C335
ABSTRACT: Raspberry (Aksu Kırmızısı, Rubin, Newburgh, Hollanda Boduru, Heritage) and blackberry (Bursa 1, Bursa 2, Jumbo, Chester) cultivars were assayed for antioxidant activity (determined as 2,2-azino-di-[3-ethylbenzothialozine-sulphonic acid][ABTS], 2,2-diphenyl-1-picrylhydrazyl radical [DPPH], and cupric ion reducing antioxidant capacity [CUPRAC]), total phenol, total flavonoid, and total anthocyanin contents. In addition, 10 anthocyanins and anthocyanidins were determined in raspberry and blackberry by liquid chromatography-mass spectrometry (LC-MS/MS). Raspberry and blackberry had the highest ABTS, DPPH, CUPRAC, total phenol, and total flavonoid contents in methanol extracts, whereas total anthocyanin contents were the highest in water extracts. The antioxidant activity of the raspberry and blackberry was directly related to the total amount of phenolic compounds detected in the raspberry and blackberry. All antioxidant activity values were highly correlated with anthocyanin content in blackberry (0.93 ≤ r ≤ 0.99, P = 0.05). On the other hand, high correlation between total flavonoid content and antioxidant activity was recorded in water extract of blackberry (0.91 ≤ r ≤ 0.93, P = 0.05). ABTS value was highly correlated with total flavonoid content in methanol extract (r = 0.90), whereas total flavonoid content was relatively less correlated with DPPH (r = 0.85) and CUPRAC (r = 0.89). 相似文献
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本研究对湛江地区7个桑葚品种青果期、转色期、成熟期三个时期桑葚果的单果重、可溶性固形物、可滴定酸含量及糖和有机酸组成和含量进行了测定,并进行了相关性分析。结果表明,在成熟过程中桑葚果实的可溶性固形物和糖含量呈增加的趋势,而酸则呈降低的趋势;在桑葚果实品种中检测出柠檬酸、苹果酸、奎宁酸、琥珀酸、酒石酸、酮戊二酸、抗坏血酸、草酸共8种有机酸,其中柠檬酸的含量最高,其在不同品种不同发育期含量为44.84%~80.86%,其次为奎宁酸和苹果酸;果糖和葡萄糖是桑葚重要的糖组成,其含量在成熟期的台湾长果桑的含量分别达到57.79 mg/g和66.72 mg/g,并且只有在台湾长果桑中检测到蔗糖;通过相关性分析,可滴定酸与可溶性固形物、果糖、葡萄糖、果重呈负相关,且可溶性固形物、果糖含量、葡萄糖含量三者之间呈极正相关。 相似文献
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研究高效液相色谱法测定番石榴叶中鞣花酸的方法。以甲醇(含0.01% HCl)作为提取液,70℃加热回流;色谱条件为:Intersil ODS-SP色谱柱(250mm×4.5mm,5μm),柱温35℃,进样体积10μL,紫外检测波长254nm;流动相为3%冰乙酸(A)-纯甲醇(B);梯度洗脱程序:0~4min B由20%至45%,保持6min,10~15min由45%至70%,15~20min由70%至100%,保持1min。结果表明:本方法的相对标准偏差为0.6%,鞣花酸在0.5~200mg/L范围内与峰面积呈良好的线性关系,相关系数为0.9998,加标回收率为95.86%~98.31%。本方法用于测定鞣花酸是切实可行的;番石榴叶片中鞣花酸含量高低与叶片的成熟度有关,其中幼嫩叶含量为0.814mg/g、成熟叶含量为0.023mg/g,而老叶中未检出。 相似文献