中国蜂蜜主要分为中蜂蜂蜜和意蜂蜂蜜两种,分别由中蜂和意蜂酿造而成。中蜂蜂蜜营养价值高,保健功能好,但是由于产量低,价格是意蜂蜂蜜的3~5倍。一些不法企业和养蜂人趁机将意蜂蜂蜜假冒中蜂蜂蜜销售,或将意蜂蜂蜜掺入到中蜂蜂蜜中以次...中国蜂蜜主要分为中蜂蜂蜜和意蜂蜂蜜两种,分别由中蜂和意蜂酿造而成。中蜂蜂蜜营养价值高,保健功能好,但是由于产量低,价格是意蜂蜂蜜的3~5倍。一些不法企业和养蜂人趁机将意蜂蜂蜜假冒中蜂蜂蜜销售,或将意蜂蜂蜜掺入到中蜂蜂蜜中以次充好。因此,如何鉴别中蜂蜂蜜和意蜂蜂蜜是当前蜂产品行业面临的一大难题。本研究以MRJP2(Major Royal Jelly Protein 2)为靶标基因,分别设计了针对中蜂和意蜂的特异性引物和探针,开发了实时荧光PCR-Taqman探针法,并对该方法的特异性和灵敏度进行了分析。结果显示该方法可以特异性的区分中蜂蜂蜜和意蜂蜂蜜;对意蜂蜂蜜DNA的最低检测限达到0.05ng,对中蜂蜂蜜DNA的最低检测限达到0.01ng;对市售中蜂蜂蜜进行真实性摸底调查发现约37%样品为中蜂蜂蜜,其余样品均含有意蜂蜂蜜成分。综上所述,中蜂蜂蜜掺假现象严重,实时荧光PCR方法检测灵敏度高、特异性强、操作简便快速,可为中蜂蜂蜜掺假问题提供技术支持。展开更多
Forty-eight vinegar samples including white vinegar,rice vinegar and mature vinegar were collected from several markets in Beijing.Butyltin compounds were determined by headspace solid-phase microextraction coupled wi...Forty-eight vinegar samples including white vinegar,rice vinegar and mature vinegar were collected from several markets in Beijing.Butyltin compounds were determined by headspace solid-phase microextraction coupled with gas chromatography and flame photometric detector after in situ ethylation with sodium tetraethylborate.Butyltin species were detected in sixteen vinegar samples and ranged from 0.012 to 14.10 lag Sn L 1.The detection rate of white vinegar is higher than that of rice vinegar and mature vinegar.Vinegar samples with relatively high butyltin concentration(〉1.5μg Sn L-1)were those stored in plastic bags,indicating that the plastic bag was one of the possible sources of butyltin contamination.This was further confirmed by the leaching experiments of three selected plastic bags,and monobutyltin was detected in the leaching solvents.According to the estimation,the average daily intake of total butyltin compounds through vinegar consumption is about 0.04 ng Sn/kg b.w.,much lower than the Tolerable Daily Intake(TDI)of 100 ng Sn/kg b.w.set by the European Food Safety Authority(EFSA).展开更多
文摘中国蜂蜜主要分为中蜂蜂蜜和意蜂蜂蜜两种,分别由中蜂和意蜂酿造而成。中蜂蜂蜜营养价值高,保健功能好,但是由于产量低,价格是意蜂蜂蜜的3~5倍。一些不法企业和养蜂人趁机将意蜂蜂蜜假冒中蜂蜂蜜销售,或将意蜂蜂蜜掺入到中蜂蜂蜜中以次充好。因此,如何鉴别中蜂蜂蜜和意蜂蜂蜜是当前蜂产品行业面临的一大难题。本研究以MRJP2(Major Royal Jelly Protein 2)为靶标基因,分别设计了针对中蜂和意蜂的特异性引物和探针,开发了实时荧光PCR-Taqman探针法,并对该方法的特异性和灵敏度进行了分析。结果显示该方法可以特异性的区分中蜂蜂蜜和意蜂蜂蜜;对意蜂蜂蜜DNA的最低检测限达到0.05ng,对中蜂蜂蜜DNA的最低检测限达到0.01ng;对市售中蜂蜂蜜进行真实性摸底调查发现约37%样品为中蜂蜂蜜,其余样品均含有意蜂蜂蜜成分。综上所述,中蜂蜂蜜掺假现象严重,实时荧光PCR方法检测灵敏度高、特异性强、操作简便快速,可为中蜂蜂蜜掺假问题提供技术支持。
基金support under the National Basic Research Program of China(2009CB421605)National Key Water Program(2009ZX07207-002-03)National Natural Science Foundation of China(20977096)
文摘Forty-eight vinegar samples including white vinegar,rice vinegar and mature vinegar were collected from several markets in Beijing.Butyltin compounds were determined by headspace solid-phase microextraction coupled with gas chromatography and flame photometric detector after in situ ethylation with sodium tetraethylborate.Butyltin species were detected in sixteen vinegar samples and ranged from 0.012 to 14.10 lag Sn L 1.The detection rate of white vinegar is higher than that of rice vinegar and mature vinegar.Vinegar samples with relatively high butyltin concentration(〉1.5μg Sn L-1)were those stored in plastic bags,indicating that the plastic bag was one of the possible sources of butyltin contamination.This was further confirmed by the leaching experiments of three selected plastic bags,and monobutyltin was detected in the leaching solvents.According to the estimation,the average daily intake of total butyltin compounds through vinegar consumption is about 0.04 ng Sn/kg b.w.,much lower than the Tolerable Daily Intake(TDI)of 100 ng Sn/kg b.w.set by the European Food Safety Authority(EFSA).
