Method for detecting trace lemon yellow pigment in black tea
A tartrazine and trace technology, applied in the direction of measuring devices, chemical instruments and methods, material separation, etc., can solve the problems of low mass transfer rate, uneven particle size, poor rigidity, etc., and achieve strong environmental pressure and uniform particle size , the effect of high selection specificity
Active Publication Date: 2020-07-10
无锡市茶叶品种研究所有限公司 +1
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Problems solved by technology
[0003]The invention can greatly improve the detection limit of tartrazine added in black tea, and overcome the low mass transfer rate and uneven particle size of traditional molecularly imprinted polymers , Poor rigidity and other defects, provide a synthetic material using surface sol-gel, which is easy to collect and reuse, and can detect trace tartrazine molecules
Method used
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Experimental program
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Effect test
Embodiment Construction
[0014] Below in conjunction with embodiment, the present invention is further described: following embodiment is illustrative, not limiting, can not limit protection scope of the present invention with following embodiment.
[0015] The invention adopts the surface imprinting method to synthesize the enrichment material with high selective adsorption to tartrazine. Its specific embodiment is:
[0016] 1. a kind of preparation method of enriching trace tartrazine high selectivity material, the step of preparation method is:
[0017] (1) Add 2.7mL TEOS to 200mg nano-sized magnetic particles, stir mechanically at room temperature for 10h, and catalyze with ammonia water.
[0018] (2) Dissolve 0.528g of template molecules in distilled water, add 980 μL of functional monomer propionaldehyde triethoxysilane, and pre-assemble at about 60°C in a weak acid environment. The reaction time is 18h, stop heating and then cool down. Mix 0.2 g of the synthesized activated magnetic particles...
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Abstract
The invention relates to a method for detecting trace lemon yellow pigment in black tea. The method is technically characterized in that lemon yellow is used as a template to synthesize a molecularlyimprinted polymer, propionaldehyde triethoxysilane is used as a functional monomer, and tetramethoxysilane is used as a cross-linking agent. The high-selectivity polymer is finally prepared through aseries of chemical synthesis and separation reaction steps by adopting a surface imprinting method and taking prepared nano magnetic particles as an inner core, and the material has the capability ofspecifically identifying trace lemon yellow molecules, can be used as a filler for high performance liquid chromatography on-line solid-phase extraction, and greatly improves the detection limit. According to the national standard of tea making, it is clear that tea leaves are not colored, any non-tea substances are not added, pigments are not allowed to be added, but some merchants still violaterelated laws and deceive consumers, lemon yellow is added into multiple kinds of black tea, and the liquor color brilliance is improved. The method provided by the invention is low in detection limitand short in detection time, and can fill the blank of related detection methods.
Description
technical field [0001] The invention relates to the technical field of food safety and detection, in particular to a preparation method of a synthetic material capable of selectively adsorbing a trace amount of azo dye tartrazine. Background technique [0002] The chemical name of tartrazine is 1-(4-sulfonic acid phenyl)-4-(4-sulfonic acid phenylazo)-5-pyrazolone-3-carboxylic acid trisodium salt, which belongs to azo A class of synthetic pigments, soluble in water. Because of its bright yellow color, stable coloring, and low price, it can be used for printing or dyeing of clothes, etc., and can also be used for food coloring, but its scope of application and dosage are strictly limited. According to the national standard of tea production, it is clear that the tea shall not be colored, any non-tea substances shall not be added, and the addition of pigments is absolutely not allowed. If the human body ingests a small amount of tartrazine, it may cause allergies, diarrhea an...
Claims
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IPC IPC(8): G01N30/02G01N30/06G01N30/08G01N30/14C08G77/14C08K3/22C08J9/26B01J20/281B01J20/30
CPCG01N30/02G01N30/06G01N30/08G01N30/14C08G77/14C08K3/22C08J9/26B01J20/281B01J20/3057C08K2201/011C08K2201/01C08K2003/2275G01N2030/062G01N2030/085G01N2030/146
Inventor 战捷
Owner 无锡市茶叶品种研究所有限公司