期刊论文

中文

武汉轻工大学学报

2095-7386

2019

38

01

1-8

10.3969/j.issn.2095-7386.2019.01.001

粮食公益性行业科研专项(201513006-3)； 湖北省自然科学基金面上项目(2014CFB888)； 武汉市国际合作项目(201231234466)；

本校为第一机构

食品中的镉包括无机镉和有机镉两种形态,无机镉的毒性显著高于有机镉。由于检测手段和测定方法的限制,目前只能测定大米中的总镉含量。本文采用超声波辅助结合酸法提取、石墨炉原子吸收光谱法(GFAAS)检测大米中的无机镉,探讨了酸的种类和浓度,以及米粉粒径、米粉与酸的比例、超声波频率和时间对镉和蛋白质得率的影响,优化前处理条件。结果显示:三氟乙酸(TFA) 0. 26 mol/L、米粉过100目筛,大米与三氟乙酸比例1∶20(g/m L)、双频超声波(25+40 kHz)提取30 min为较佳的前处理条件。在该前处理条件下,GFAAS法的检出限为0. 07μg/L,加标回收率范围为98. 62-103. 49%,精密度(3. 44%)和重复性(1. 81%)良...

Cadmium in foods includes inorganic cadmium and organic cadmium,and the toxicity of inorganic cadmium is significantly higher than that of organic cadmium.Currently,it is only possible to determine the total cadmium content in rice,because of the limitations of detection and measurement methods.Combined ultrasound and acid methods were used to extract and graphite furnace atomic absorption(GFAAS)were used to detect inorganic cadmium in rice in this paper.The types and concentrations of acids,as well as the effects of rice flour particle size,ac...