粮食与油脂
糧食與油脂
양식여유지
CEREALS & OILS
2013年
3期
21-23
,共3页
王啊娟%付湘晋%赵喜玲%张桢敏%刘雅晴
王啊娟%付湘晉%趙喜玲%張楨敏%劉雅晴
왕아연%부상진%조희령%장정민%류아청
糙米%发芽糙米%重金属
糙米%髮芽糙米%重金屬
조미%발아조미%중금속
brown rice%germinated brown rice%heavy metal
重金属含量超标是我国稻米生产面临严重食品安全隐患之一.糙米中重金属主要以蛋白、纤维、植酸结合态存在,在糙米发芽过程中,蛋白、纤维素、植酸在蛋白酶、纤维素酶、植酸酶作用下部分降解;由此,结合态重金属可能转变为游离态,从糙米内部迁移而出,从而可降低米中重金属含量.基于此,以市场收集8种糙米为样品,采用微波消解、ICP–MS法测定这些糙米发芽前后重金属镉、铅、砷含量,为糙米、发芽糙米产品安全食用提供参考.结果表明,8个样品中,3个样品镉超标,5个样品铅、砷含量超标,镉、铅、砷最高超标幅度分别达589.5%、641%、2625%;对重金属(镉、铅、砷)超标糙米样品而言,经发芽后,糙米铅、砷、镉含量降低幅度分别为89.0%~100%、60%~100%、6.2%~35.5%;所以,糙米经发芽后能有效降低米中铅和砷含量,但对降低镉含量效果稍差.
重金屬含量超標是我國稻米生產麵臨嚴重食品安全隱患之一.糙米中重金屬主要以蛋白、纖維、植痠結閤態存在,在糙米髮芽過程中,蛋白、纖維素、植痠在蛋白酶、纖維素酶、植痠酶作用下部分降解;由此,結閤態重金屬可能轉變為遊離態,從糙米內部遷移而齣,從而可降低米中重金屬含量.基于此,以市場收集8種糙米為樣品,採用微波消解、ICP–MS法測定這些糙米髮芽前後重金屬鎘、鉛、砷含量,為糙米、髮芽糙米產品安全食用提供參攷.結果錶明,8箇樣品中,3箇樣品鎘超標,5箇樣品鉛、砷含量超標,鎘、鉛、砷最高超標幅度分彆達589.5%、641%、2625%;對重金屬(鎘、鉛、砷)超標糙米樣品而言,經髮芽後,糙米鉛、砷、鎘含量降低幅度分彆為89.0%~100%、60%~100%、6.2%~35.5%;所以,糙米經髮芽後能有效降低米中鉛和砷含量,但對降低鎘含量效果稍差.
중금속함량초표시아국도미생산면림엄중식품안전은환지일.조미중중금속주요이단백、섬유、식산결합태존재,재조미발아과정중,단백、섬유소、식산재단백매、섬유소매、식산매작용하부분강해;유차,결합태중금속가능전변위유리태,종조미내부천이이출,종이가강저미중중금속함량.기우차,이시장수집8충조미위양품,채용미파소해、ICP–MS법측정저사조미발아전후중금속력、연、신함량,위조미、발아조미산품안전식용제공삼고.결과표명,8개양품중,3개양품력초표,5개양품연、신함량초표,력、연、신최고초표폭도분별체589.5%、641%、2625%;대중금속(력、연、신)초표조미양품이언,경발아후,조미연、신、력함량강저폭도분별위89.0%~100%、60%~100%、6.2%~35.5%;소이,조미경발아후능유효강저미중연화신함량,단대강저력함량효과초차.
Heavy metal content exceed the standard is a hidden hazard of our country's rice production. In brown rice,the heavy metal ions are mainly combined with the proteins,fibril,and phytic acid, which would be partly hydrolyzed by proteases,cellulose and phytase during the germination process of brown rice,thus,the combined state of the heavy metals may change into free states,and then emigrate from the internal of brown rice,resulting in reduce the heavy metal content of brown rice. Based on this consideration,this article collected 8 kinds of brown rice from the market as the sample, the microwave digestion,ICP–MS method was used to determine the content of heavy metal cadmium, lead,arsenic in the brown rice and germinated brown rice. The results showed that:among the 8 samples,3 samples' cadmium content exceed the standard,5 samples' lead,arsenic content exceed the standard,the highest content of cadmium,lead,arsenic exceed the standard 589.5%,641%,2625%, respectively;some samples also exist at the same time a variety of heavy metal exceed the standard of heavy metals (cadmium,lead,arsenic) exceed the standard of brown rice samples,germination reduce content of lead,arsenic,cadmium in brown rice for 89.0%~100%,60%~100%,6.2%~35.5%, respectively. In conclusion,germination can effectively reduce the content of lead and arsenic,but with less effectiveness to reduce the cadmium content.
