Determination of cyanide contents in sorghum,Daqu,and fermented grains using EDTA-2Na-phosphoric acid distillation-automatic flow injection analyzer
The cyanide contents in sorghum,Daqu,and fermented grains were extracted with ethylenediaminetetraacetic acid disodium salt(EDTA-2Na)-phosphoric acid(2 g-5 ml)distillation system.A rapid determination method for cyanide contents in sorghum,Daqu,and fermented grains was established combined with automatic flow injection analysis technology.The results showed that cyanide contents had a good linear relationship in the range of 5-200 μ g/L(R2=0.999 6),the limit of detection(LOD)was 8.10 μg/kg,and the limit of quantitation(LOQ)was 25.00 μg/kg.The precision,repeatability and stability were all good,the relative standard deviations(RSD)was less than 10％,and the standard recovery rates were 82.23％-97.64％.The detection method had simple pretreatment,high detection efficiency,accurate and reliable quantitative results.It was suitable for the detection and analysis of cyanide contents in large quantities of sorghum,Daqu and fermented grains,and had important practical significance for improving the quality and safety monitoring ability of Baijiu.
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