ICP-AES法测定食用木薯淀粉中19种元素含量

ICP-AES Method for Determination of 19 Elements in Edible Cassava Starch

研究加工工艺及木薯品种对食用木薯粉中矿物元素含量组成的影响。采用不同品种的木薯为原料经不同的工艺制备食用木薯粉,利用微波消解、电感耦合等离子体原子发射光谱法(ICP-AES)测定食用木薯粉中的19种无机元素:K,Na,Ca,Mg,P,Fe,Mn,Zn,Al,Cu,Cr,Cd,Pb,Hg,Ba,Sr,Co,As,B,并用SPSS软件对测定结果进行差异性分析。分析元素测定的RSD值均小于5%,加标回收率在88.6%～106.7%之间;食用木薯淀粉中元素含量丰富,Cu,Cr,Cd,Pb,Hg,Ba,Sr等重金属元素含量较低,K,Na,Mg,P,Ca,Fe,Al,Mn,Zn等营养元素含量较高;加工工艺以及木薯品种对食用木薯粉中元素含量有显著性的影响。该方法测定食用木薯淀粉19种元素结果准确、重现性好,符合痕量分析的的要求,食用木薯粉中矿物元素含量的保留程度与加工制备工艺密切相关。

Both processing technics and cassava cultivars which influence of mineral elements of the edible cassava starch were researched in the composition. Different kinds of cassava were choosen as raw materials with different process technics to produce edible cassava starch. The contents of 19 elements in the edible cassava starch, included kalium, sodium, calcium, magnesium, phosphorus, ferrum, manganese, zinc, aluminum, cuprum, chromium, cadmium, lead, mercury, barium, strontium, cobalt, arsenic and boron were determined by ICP-AES. The difference of the determination results were analyzed by SPSS software. The relative deviation of element content was no more than 5% and the recovery rate was 88.6%-106.7%. The content of elements was rich in the edible cassava starch. The content of heavy metal elements （Cu, Cr, Cd, Pb, Hg, Ba, Sr） were much lower than nutrient elements （K, Na, Mg, P, Ca, Fe, Al, Mn, Zn）. There were significant influence among the inorganic elements of edible cassava starch which were produced by different process technics and different cassava variety. The conclusion indicated this method which was used to measure 19 kinds of elements of edible cassava starch can get accurate result, and it has good reproducibility, according with the requirement of the trace analysis. The retained degree of mineral elements content in the edible cassava starch was closely relation with the processing technics.