(一) 仪器和用具
万用电炉; 装有细沙的金属盘(砂浴盘)或石棉网;烧杯:100ml; 温度计:300~350℃;铁支柱等。
(二)操作方法
取混匀试样约50ml注入100ml烧杯内,置于带有砂浴盘的电炉上加热,用铁支柱悬挂温度计,使水银球恰在试样中心,加热在16~18min内使试样温度升至280℃(亚麻子油加热至289℃),取下烧杯,趁热观察析出物多少和油色深浅情况。待冷却至室温后,再观察一次。
(三)试验结果
植物油脂加热试验仅是鉴别油脂中磷脂含量的简易方法,不是定量分析,因此试验结果以“油色不变”、“油色变深”、“油色变黑”、“无析出物”、“有微量析出物”、“多量析出物”以及“有刺激性异味”等表示。
微量析出物:油温加至280℃时趁热观察,有析出物悬浮。
多量析出物:析出物成串、成片结团。
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