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

Active Publication Date: 2014-05-21
FUJIAN CENT FOR DISEASE CONTROL & PREVENTION
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Thin-layer chromatography is complicated to operate, and its quantitative ability is insufficient; molecular fluorescence photometry and ultraviolet spectrophotometry can only measure the total amount of FWAs, and the extract is easily interfered by impurities, which leads to high measurement results; the current determination of fluorescent whitening The mainstream method for ion-pairing reagents is ion-pair high-performance liquid chromatography. For example, Shu et al. used tetrabutylammonium bromide (TBAB) as ion-pairing reagents for isocratic elution to simultaneously analyze four DSD-FWAs (Shu W C, et al. Journal of Chinese chemical society, 2009,56(4):797-803.); However, due to the similar structure of DSD-FWAs compounds and the difficulty of obtaining DSD-FWAs standard products, the study on the separation characteristics of DSD-FWAs by ion-pair chromatography It is not yet in place, and the existing domestic and foreign detection techniques cannot keep up with the practical application of DSD-FWAs in paper materials
In addition, domestic and foreign methods for the extraction of DSD-FWAs in paper food packaging materials mostly use hot water extraction with a relatively low extraction rate (Jeong S K, et al. Bull. Korean Chem. Soc. 2012, 32(3), 3971 -3976.), need to develop a more efficient extraction method

Method used

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  • Method for detecting content of 11 kinds of fluorescent whitening agents in paper food packaging material
  • Method for detecting content of 11 kinds of fluorescent whitening agents in paper food packaging material
  • Method for detecting content of 11 kinds of fluorescent whitening agents in paper food packaging material

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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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Abstract

The invention discloses a method for detecting the content of 11 kinds of fluorescent whitening agents (FWAs) in a paper food packaging material. The 11 kinds of fluorescent whitening agents comprise 5 kinds of disulfonic acid FWAs (C.I71, 85, 90, 113, FWA5bm), 3 kinds of tetrasulfonic acid FWAs (C.I24, 210, 220) and 3 kinds of hexasulfonic acid FWAs (C.I264, 353, 357). The method is characterized by comprising the following steps: (1) preparing a sample; (2) extracting a to-be-determined substance; (3) degreasing; (4) concentrating; and (5) carrying out high performance liquid chromatography detection. The method provided by the invention is easy to operate, is high in flexibility, can separate and detect 11 kinds of substances synchronously, is accurate in qualitative and quantitative analysis result, is low in detection limit, and is high in analysis speed.

Description

technical field [0001] The invention relates to a method for detecting fluorescent whitening agents in paper food packaging materials, in particular to ultrasonically extracting a mixed solvent of water and an organic solvent, and using high performance liquid chromatography to simultaneously detect 11 kinds of double triplets in paper food packaging materials The invention discloses a high-throughput detection method for an azininostilbene type fluorescent whitening agent, which belongs to the fields of food analysis and packaging materials. Background technique [0002] Fluorescent whitening agents (FWAs for short) are widely used in paper, textiles and detergents to increase the whiteness and brightness of commodities, among which 80% of FWAs in paper are bistriazine aminostilbene type fluorescent whitening agents ( Abbreviated as DSD-FWAs). However, because some unscrupulous merchants recycle office waste paper containing a large amount of DSD-FWAs for the production of...

Claims

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Application Information

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IPC IPC(8): G01N30/88
Inventor 傅武胜陈立松蒋定国邱汉泉方勤美吴少明
Owner FUJIAN CENT FOR DISEASE CONTROL & PREVENTION
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