Method for detecting content of 11 kinds of fluorescent whitening agents in paper food packaging material
A technology for fluorescent whitening agent and food packaging, applied in the field of food analysis and packaging materials, can solve the problems of insufficient quantitative ability, high measurement results, low extraction rate, etc., and achieve accurate qualitative and quantitative analysis results, fast analysis time, and simple operation. Effect
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Embodiment 1
[0043] Embodiment 1: the detection of fluorescent whitening agent content in paper towel
[0044] (1) Sample preparation
[0045] Take the paper towel sample and cut it into 1×1 cm with scissors 2 confetti. Transfer all the paper scraps to the high-speed pulverizer, close the lid of the pulverizer tightly, and pulverize 6 times at a speed of 10,000 rpm, each time for about 15 seconds, and pulverize the paper scraps into fibers. After each pulverization, use a spoon to remove the paper Stir in the crumbs. Samples were stored in a dark place at room temperature until further use.
[0046] (2) Extraction of substances to be tested
[0047] Weigh 0.5 g of uniformly pulverized paper towel samples into a 50 mL polypropylene plastic centrifuge tube; tighten the laboratory curtains and turn off the laboratory fluorescent lamps to keep the experimental environment in a dark state. Add 25 mL of acetonitrile / water (2:3, v / v), and conduct ultrasonic extraction for 35 min in a water...
Embodiment 2
[0058] Embodiment 2: the detection of fluorescent whitening agent content in paper cup
[0059] (1) Sample preparation
[0060] Take the paper cup sample and unfold it into a flat plate, and crush the paper cup into paper scraps through a paper shredder one by one. Transfer all the paper scraps to the high-speed pulverizer, close the lid of the pulverizer tightly, and pulverize 6 times at a speed of 10,000 rpm, each time for about 15 seconds, and pulverize the paper scraps into fibers. After each pulverization, use a spoon to remove the paper Stir in the crumbs. Samples were stored in a dark place at room temperature until further use.
[0061] (2) Extraction of substances to be tested
[0062] Weigh 0.5 g of uniformly pulverized paper cup samples into a 50 mL polypropylene plastic centrifuge tube; tighten the laboratory curtains and turn off the laboratory fluorescent lamps to keep the experimental environment in a dark state. Add 25 mL of acetonitrile / water (2:3, v / v),...
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