饲用油脂品质初步调查分析

目的以油脂中脂肪酸含量和极性成分为依据,用气相色谱法和快速筛查试剂盒对饲料用油脂品质进行初步分析。方法取自国内饲料企业的280份饲料用油脂样品,包括猪油、鸭油、鸡油、大豆油、大豆磷脂油、玉米油、米糠油、棕榈油等动植物油脂和未知种类的油脂,与自制或采购标准的动物油脂和植物油脂,进行脂肪酸种类、含量和极性成分的测定,对其品质作出初步判定。结果脂肪酸分析结果证明,动物油样品和植物油样品中的部分脂肪酸成分含量均发生不同程度的降低或增高;极性成分检测的83个样品中,其中标准值为0.1,极性成分吸光值在0.147～0.947的样品占55个,阳性率达66.26%。结论未知类型样品超过半数为不合格样品;未知油脂样品脂肪酸组成不符合单一油脂比值范围,推断可能为混合油脂。根据极性成分含量高低不同,判断部分样品可能为复炸油。

Investigation and analysis on the quality of feed oil

Objective Based on the fatty acid content and polar components in oils and fats, to analyze the quality of feed oils and fats by gas chromatography and rapid screening kit. Methods Total of 280 samples of animal and vegetable oils, including lard, duck oil, chicken oil, soybean oil, soybean phospholipid oil, corn oil, rice bran oil, palm oil, and some unknown oils were collected from domestic market. The kinds, content and polar components of fatty acids were determined by comparison with standard or self-made animal and vegetable oils, and their qualities were preliminarily determined. Results Fatty acid analysis results showed that the content of some fatty acids from both animal and vegetable oil samples decreased or increased to some extent. Among the 83 samples tested for polar components, the standard value was 0.1, and 55 samples with the absorbance value between 0.147 and 0.947 had positive rate of 66.26%. Conclusion More than half of the samples of unknown type are unqualified samples. The composition of fatty acids in unknown oil samples does not conform to the single oil ratio range, so it is inferred that they may be mixed oils. According to the different content of polar components, some oil samples may be from used frying oil.