Clenbuterol is a steroid-type drug used in respiratory treatments in both humans and animals. However, it has a secondary effect related to the hypertrophy process in muscle and fat reduction. The illegal or bad use of clenbuterol has been reported in several countries, but there is scarce information in South America, where the production and consumption of meat are considerable. In this sense, the present study aimed at evaluating the occurrence of clenbuterol in bovine muscle and liver samples from a high cattle production area of Ecuador in 2015 and 2018. For this purpose, 57-58 samples were evaluated in 2015 and 20 samples in 2018 using the Enzyme-Linked Inmuno Sorbent Assay and ultrahigh-performance liquid chromatography-tandem mass spectrometry. The results showed complained results for clenbuterol in meat samples from both years and 23% (2015) and 85% (2018) of the samples of meat complied the maximum residue level defined by CODEX.

中文翻译：

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厄瓜多尔牛肌肉和肝脏中盐酸克仑特罗的调查。

瘦肉精是一种类固醇类药物，用于人类和动物的呼吸道治疗。但是，它在肌肉和脂肪减少方面具有与肥大过程有关的次要作用。几个国家已经报告了非法或滥用盐酸克仑特罗的情况，但是在南美，那里的肉类生产和消费量相当可观，因此缺乏信息。从这个意义上讲，本研究旨在评估2015年和2018年厄瓜多尔牛高产区牛肌肉和肝脏样品中盐酸克伦特罗的存在。为此，2015年评估了57-58个样品，2018年评估了20个样品使用酶联免疫吸附剂测定法和超高效液相色谱-串联质谱法。