Method for reducing content of heavy metal ions such as arsenic and lead in instant tea

Abstract

The invention relates to a method for reducing the content of heavy metal ions such as arsenic and lead in instant tea. The method comprises the steps of preparing a concentrated solution in mass concentration of 5 to 15 percent by virtue of steps including extraction, centrifuging, filtering, concentration and the like, adsorbing tea polyphenol of the concentrate solution by virtue of a resin column which is filled with LX-8 macroporous adsorption resin, adsorbing heavy metal ions including arsenic, lead and the like in the column passing solution by virtue of a resin column which is filled with chelating resin LSA-100, collecting an elution solution of LX-8 resin and a column passing solution of LSA-100, uniformly mixing the elution solution and the column passing solution to obtain a mixed solution, concentrating and drying the mixed solution, and preparing the instant tea powder with low heavy metal content. The removal rate of the heavy metal ions such as the arsenic and lead in the instant tea powder processed in the method can reach 50 percent, the loss rate of the tea polyphenol is less than 5 percent, the operation is simple, the original quality of the instant tea is maximally reserved, the heavy metal removal effect is obvious, the restriction of the raw material for producing the instant tea can be broken through, the selection range of the raw material is enlarged, and the safety and the market competence of the instant tea product can be improved.

Description

technical field [0001] The invention relates to the field of tea deep processing quality safety control, in particular to a method for reducing the content of heavy metal ions such as arsenic and lead in instant tea. Background technique [0002] Heavy metal ions in tea mainly include lead (Pb), arsenic (As), copper (Cu), cadmium (Cd), mercury (Hg), chromium (Cr), etc. pollution, tea quality problems caused by excessive heavy metal content are increasing. These heavy metals such as arsenic, lead, cadmium, mercury, etc. are not necessary for life activities, and excessive intake will affect human health. More and more tea importing countries have increased The limit index of heavy metal content in tea has been set. The problem of heavy metal content in tea has affected the export of tea in my country; have occurred, therefore, the control of heavy metals in tea and instant tea production has received more and more attention. my country's national standard for solid beverages h...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for reducing the content of heavy metal ions such as arsenic and lead in instant tea, which is used to solve the problem of high or excessive heavy metals in existing instant tea, improve the safety of instant tea, and improve the quality of instant tea products. market competitiveness