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Abstract¡¡This thesis mainly explains the principle reasons of sedimentation in oolong tea drinks in PET bottles and the solving methods.It is indicated through research that the sediment is mainly:1)it is very easy for the tea poly-phenol in the drinks and its oxide to synthesize the coffee alkali to form sediment.Other macromolecule materials in the tea like protein and starch many also subside.2)the existing of Ca2+and Mg2+ in the drinking water may promote the subsidence.3)the inffluence of pH value in the tea liquid.The sediment can be prevented considerably by means of purifying the water source (antiion),ultra-film filtering (micro-filtering) and technology of ultrahigh temperature(UHT)sterilization.Key words¡¡oolong tea;reasons of sedimentation;methods of settlement
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