微波消解-ICP-AES法测定葡萄皮渣中生命元素
2012-09-12马娜娜张静万力张昂刘金串孟江飞张振文房玉林
马娜娜,张静,万力,张昂,刘金串,孟江飞,张振文,3,房玉林,3,*
(1.西北农林科技大学葡萄酒学院,陕西杨陵712100;2.宁夏葡萄产业协会,宁夏银川750000;3.陕西省葡萄与葡萄酒工程技术研究中心,陕西杨陵712100)
微波消解-ICP-AES法测定葡萄皮渣中生命元素
马娜娜1,张静2,万力1,张昂1,刘金串1,孟江飞1,张振文1,3,房玉林1,3,*
(1.西北农林科技大学葡萄酒学院,陕西杨陵712100;2.宁夏葡萄产业协会,宁夏银川750000;3.陕西省葡萄与葡萄酒工程技术研究中心,陕西杨陵712100)
采用微波消解技术处理样品,建立了ICP-AES法测定酿酒葡萄赤霞珠、霞多丽和野生山葡萄、毛葡萄皮渣中钾、钠、钙、镁、铬、铜、铁、锰、镍、硒、锌、钴、钒、锡、钼等15种生命元素的方法。对微波消解程序(包括消解液体系、用量等)和ICP仪器操作参数进行了优化选择,并对分析方法进行了质量评价。结果表明:葡萄皮渣中含有种类丰富的生命元素,其中 K、Na、Ca、Mg、Cu、Fe、Mn、Zn 的含量较高,Cr、Ni、Se、Co、V、Sn 及 Mo 的含量也不容忽视。在优化条件下,该方法的 RSD 为 0.56%~3.21%(n=10),平均加标回收率为 95.1%~110.2%(n=6)。该方法精密度高、重现性好,完全满足葡萄皮渣中多种生命元素的测定的要求。结合前人研究成果,揭示了葡萄皮渣具有较高的营养和保健价值。
微波消解,ICP-AES,葡萄皮渣,生命元素
Abstract:An Inductively Coupled Plasma atomic emission spectrometry(ICP-AES)for determination of the contents of 15 biological elements(K,Na,Ca,Mg,Cu,Fe,Mn,Zn,Cr,Ni,Se,Co,V,Sn and Mo)in grape pomace after microwave-assisted digestion of the sample had been established.The microwave-assisted digestion procedure (including digestion system)and the techniques for operating ICP instrument were optimized,and the analytical method was validated.The results showed that the biological element species in grape pomace are abundant,among which the contents of K,Na,Ca,Mg,Cu,Fe,Mn and Zn are rather high and others are not ignored.The relative standard deviations were from 0.56%to 3.21% (n=10),and the average recoveries were from 95.1%to 110.2% (n=6)under the optimized conditions.Repeated validations indicated that this method was precise,sensitive and reproducible for the determination of biological elements in various grape pomaces.The comprehensive research results of the authors and previous researchers show that grape pomace has high nutrition and health protection value.
Key words:microwave digestion;ICP-AES;grape pomace;biological element
葡萄皮渣(Grape Pomace,GP)包括葡萄皮、葡萄籽、果梗及果肉残留,是葡萄酒产业最主要的副产物之一,其产率约占葡萄重量的20%[1]。目前,国外对葡萄皮渣的研究主要集中在4个方面:1.葡萄皮渣中功能性成分提取回收的研究,如天然色素(Natural Colorants,NC)[2-4]、膳食纤维(Dietary Fibre,DF)[1]、有机酸(Organic Acid,OA)[5]、以亚油酸为主的多不饱和脂肪酸(Polyunsaturated Fatty Acids)[6]和具有抗氧化能力的多酚类化合物(Polyphenolic Compounds,PC)[7-12];……
