Quick test method for mineral oil in food
An inspection method and mineral oil technology, which is applied in the direction of testing food, material inspection products, and preparation of test samples, etc., can solve the problems of mixing mineral oil and harming consumers' health, and achieve rapid inspection, protection of health, and low cost low effect
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[0007] Take 20 grams of food samples that have been crushed and passed through a 40-mesh sieve in a conical flask, add 20-40 ml of anhydrous ether for leaching for 1-3 hours, filter with filter paper, take a drop of the filtrate and place it on a glass slide. After the ether evaporates, place it under a microscope Observe in dark field with a 16x eyepiece × 10x objective. If fibrous roots or networks can be observed, mineral oil is added; if only oil bubbles are observed, vegetable oil (such as rapeseed oil, peanut oil, palm oil) is added. For example, mineral oil and vegetable oil are added to the sample at the same time. If it is, the ether extract observed in the field of view is a concentric chromatographic distribution; the center is the ethanol extract of the sample itself, with different shapes and irregular shapes; the periphery is the extract of mineral oil, which can be observed Fibrous root or network; the edge is vegetable oil extract, in the form of oil bubbles. ...
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