X射线荧光分析测定不同品牌大米中的微量元素
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摘要
大米是人类从外界获得营养的主要方式之一,大米中的微量元素对人体的健康有重要的意义.为人体合理补充微量元素提供参考意见.本文利用X射线荧光分析方法并结合干灰化样品前处理方法研究了岳阳、五常、新民、哈尔滨、万昌等5种不同品牌大米中K、Ca、Cr、Mn、Fe、Co、Ni、Cu、Zn、As、Se、Sr等微量元素的含量;同时,用毛细管X光透镜聚焦的微束X射线荧光扫描了单粒大米中多元素的分布.结果表明,5种品牌大米中所含微量元素种类基本相同,五常大米中对人体有益的元素Ca、Fe、Ni、Zn等含量较高;此外,P、Cl、K、Ca等元素主要富集在大米的胚芽处.大米中微量的金属元素Fe、Cu、Zn等元素分布均匀.
Rice is one of the main food for humans to obtain energy from the outside world,and trace elements in rice are of great significance to human health.To provide references for human,food concentrations of K,Ca,Cr,Mn,Fe,Co,Ni,Cu,Zn,As,Se,Sr in rice of Yueyang,Wuchang,Xinmin,Harbin,Wanchang were analyzed by X-ray fluorescence after dry ash pretreatment and distribution of elements in rice was studied by micro-X-ray fluorescence.It found that concentrations of elements in the five brands were similar.Moreover Wuchang rice was the most abundant in Ca,Fe,Ni,Zn elements.Micro-X-ray fluorescence analysis indicated that Fe,Cu and Zn were evenly distributed while P,Cl,K,Ca were enriched in the rice germ.
Rice is one of the main food for humans to obtain energy from the outside world,and trace elements in rice are of great significance to human health.To provide references for human,food concentrations of K,Ca,Cr,Mn,Fe,Co,Ni,Cu,Zn,As,Se,Sr in rice of Yueyang,Wuchang,Xinmin,Harbin,Wanchang were analyzed by X-ray fluorescence after dry ash pretreatment and distribution of elements in rice was studied by micro-X-ray fluorescence.It found that concentrations of elements in the five brands were similar.Moreover Wuchang rice was the most abundant in Ca,Fe,Ni,Zn elements.Micro-X-ray fluorescence analysis indicated that Fe,Cu and Zn were evenly distributed while P,Cl,K,Ca were enriched in the rice germ.
引文
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[3]Wei Yi Hua,Zhang Jin Yan,Zhang Da Wen,et al..Simultaneous determination of Se,trace elements and major elements in Se-rich rice by dynamic reaction cell inductively coupled plasma mass spectrometry(DRC-ICPMS)after microwave digestion[J].Food Chemistry,2014,159(15):507
[4]Silvia S,Farías,Agustín,L et al.On-line speciation and quantification of four arsenical species in rice samples collected in Argentina using a HPLC—HG—AFS coupling[J].Microchemical Journal,2015(120):34
[5]Srinuttrakul W,Busamongkol A.Elemental analysis of brown rice by inductively coupled plasma atomic emission spectrometry and instrumental neutron activation analysis[J].Energy Procedia,2014(56):85
[6]田福林,李红,刘成雁,等.GC-MS法对不同产地大米的快速鉴定[J].分析测试学报,2011,30(9):1059
[7]张辉,余正东,吴敏等.ED-XRF法快速测定大米中镉元素的实用性分析[J].食品工业,2015,36(12):259
[8]Liang Jianfen,Li Zaigui,Kouichi Tsuji,et al.Milling characteristics and distribution of phytic acid and zinc in long-mediumand short-grain rice[J].Journal of Cereal Science.2007,48(1):83
[9]邓勇军,张一云,吴丽萍,等.用X荧光分析方法对大米加工过程中微量元素流失规律的研究[J].四川大学学报(自然科学版),2002,39(6):1065
[10]张克勤,杨雪梅.X射线荧光光谱及拉曼光谱法研究五谷营养成分[J].光谱实验室,2011,28(3):1198
[11]Mihucz V G,Silversmit G,Szalki I,et al.Removal of some elements from washed and cooked rice studied by inductively coupled plasma mass spectrometry and synchrotron based confocal micro-X-ray fluorescence[J].Food Chemistry,2010,121:290
[12]Lombi E,Scheckel K G,Pallon J,et al.Speciation and distribution of arsenic and localization of nutrients in rice grains[J].New Phytologist,2009,184(1):193
[13]吉昂,陶光仪,卓尚军,等.X射线荧光光谱分析[M].北京:科学出版社,2003:91
[14]Somogyi A,Drakopoulos M,Vincze L,et al.ID18F:a new micro-X-ray fluorescence end-station at the European Synchrotron Radiation Facility(ESRF):preliminary results[J].X-Ray Spectrum,2001(30):242
[15]Cheng Lin,Ding Xunliang,Liu Zhiguo,et al.Development of a micro-X-ray fluorescence system based on polycapillary X-ray optics for non-destructive analysis of archaeological objects[J].Spectrochimica Acta Part B,2007,62(8):817
[16]程琳,李梅田,王君玲,等.微束X射线荧光分析清代金釉碗彩料的化学成分和元素分布[J].激光与电子学进展,2015,52(4):043401
[17]程琳,李梅田,王君玲,等.北京龙泉务窑白瓷化学组成的研究[J].光学学报,2015,35(1):0116002