多元素含量和δ^(13)C值对食醋标签标识真实性的初步探索研究

Preliminary Exploration Study on the Authenticity of Vinegar Label with Multi-element Content and δ^(13)C Value

研究建立电感耦合等离子体发射光谱(ICP-OES)直接进样测定食醋中Cd,Cr,Cu,Mn,Zn,Sr,K,Na,Ca,Mg,Fe 11种元素含量的方法和电感耦合等离子体质谱(ICP-MS)直接进样测定I元素含量的测定方法,并验证了直接进样方式下测定结果的准确性。采用ICP-OES、ICP-MS、稳定同位素比率质谱(IRMS)对食醋及原料中K,Na,Ca,Mg,Fe,Al,As,Cd,Cr,Cu,Mn,Zn,Sr,Ni,Pb,I 16种元素和δ13C值进行测定,通过系统的统计学方法对测定结果进行分析。发现原料大米中不同元素含量的差别无法传递给相应的食醋;原料焦糖色中元素的含量差异很大。针对于食醋成品:Mn和生产原料中的红曲、麸皮相关;Na的主要来源是外源添加的食用盐或含钠添加剂;K,Mg受原料大米和生产工艺的双重影响;Sr和Zn两元素或可成为产地溯源的辅助依据;δ13C值的变化与葡萄糖及焦糖色有关,但均在C3植物的δ13C值区间内。以上研究结果尚不能对食醋的真实性进行判别,仍需进一步深入研究。

Establish a method for direct injection determination of Cd,Cr,Cu,Mn,Zn,Sr,K,Na, Ca,Mg,Fe elements content in vinegar by ICP-OES and determination of I element content with direct injection by ICP-MS,validate the accuracy of measurement results in direct injection way. Measure 16 kinds elements such as K,Na,Ca,Mg,Fe,Al,As,Cd,Cr,Cu,Mn,Zn,Sr,Ni,Pb, I andδ13 C in vinegar and raw materials by ICP-OES,ICP-MS,IRMS.Use the system statistical methods to analyze the measurement results.It is found that the differences of different elements content in rice can not be delivered to the appropriate vinegar;the differences of elements content in caramel are great .For vinegar products ：Mn relates to the red yeast rice and bran in raw materials ;the main source of Na is exogenously added salt or sodium additives;double impact K,Mg by raw materials and production processes,there is a certain relevance;Sr and Zn can be a two-element or provenance of the auxiliary basis;changes inδ13 C values relate to glucose and caramel but theirδ13 C values are within the range of C3 plants.Above findings not yet determine the authenticity of vinegar, further research is still required.