Arslan Sinan, Mert Ilkem Demirkesen, Yiğitkaya Sema, Dagaşan Ozlem, Sakallı Feridun Nihat, Oztürk Selma
a Food Enterprises and Codex department , Ministry of Agriculture and Forestry , Ankara , Turkey.
b Food Quality Laboratories , Ministry of Agriculture and Forestry , Ankara , Turkey.
Food Addit Contam Part A Chem Anal Control Expo Risk Assess. 2019 Jan;36(1):131-140. doi: 10.1080/19440049.2018.1562235. Epub 2019 Jan 11.
Turkey plays an important role in the international trade of apricots as it has the largest production rate in the world. Since the sulphurisation process is allowed to be used for different products, the effect of residual sulphur and its compounds (which can be found in products as pesticide residues or additive residues) on the positive detection of carbon disulphide (CS) still creates a big challenge in international trade. Therefore, the main objective of the present study was to investigate the effects of residues of sulphur or sulphur compounds on dithiocarbamate analysis methods based on CS measurement. In this study, apricots were chosen since they contain sulphur residues as a result of the sulphurisation process. Sulphur dioxide and dithiocarbamate analyses were conducted on dried apricots prepared with the sulphurisation process (SA) and without the sulphurisation process (NSA); analysis was by two different accredited laboratories. No of pesticide was applied to either SA or NSA samples. Although some of the NSA samples had <LOQ values, approximately 70 ± 32 mg/kg SO and 0.061 ± 0.021 mg/kg dithiocarbamate were detected for NSA samples. On the other hand, for the SA sample group, 927-2915 mg/kg of SO and 0.265-0.825 mg/kg of dithiocarbamate were detected. Furthermore, a strong correlation between residual sulphur and dithiocarbamate values was observed. This study showed that the analysis method based on CS measurement may lead to false positive results for dithiocarbamates when residues of sulphur or sulphur compounds are found in products as pesticide or additive residues. Therefore, residual sulphur compounds as a result of the sulphurisation process (which is not considered during the evaluation of products) must be taken into account during the evaluation of products for dithiocarbamates.
土耳其在杏子国际贸易中扮演着重要角色，因为其杏子产量位居世界第一。由于硫化工艺可用于不同产品，残留硫及其化合物（在产品中可能以农药残留或添加剂残留的形式存在）对二硫化碳（CS）阳性检测的影响，在国际贸易中仍然是一个巨大挑战。因此，本研究的主要目的是调查硫或硫化合物残留对基于CS测量的二硫代氨基甲酸盐分析方法的影响。在本研究中，选择杏子是因为它们在硫化过程中会含有硫残留。对经过硫化处理（SA）和未经过硫化处理（NSA）的干杏子进行了二氧化硫和二硫代氨基甲酸盐分析；分析由两个不同的认可实验室进行。SA和NSA样品均未施用农药。虽然一些NSA样品的含量低于定量限，但NSA样品中检测到约70±32毫克/千克的二氧化硫和0.061±0.021毫克/千克的二硫代氨基甲酸盐。另一方面，对于SA样品组，检测到927 - 2915毫克/千克的二氧化硫和0.265 - 0.825毫克/千克的二硫代氨基甲酸盐。此外，观察到残留硫与二硫代氨基甲酸盐值之间存在很强的相关性。本研究表明，当产品中存在硫或硫化合物残留（如农药或添加剂残留）时，基于CS测量的分析方法可能会导致二硫代氨基甲酸盐出现假阳性结果。因此，在评估产品中二硫代氨基甲酸盐时，必须考虑硫化过程产生的残留硫化合物（在产品评估过程中未被考虑）。
