| It was studied in this thesis the preparation of Artemisia glue, under the condition of alkali, chloroacetic acid was used as etherification agent and the properties, structures and application in quick-frozen dumpling were researched too.In the single factor experiments, the affects of degree of substitution(DS) and reaction efficiency(RE) by some factors,which included,the alkalifying time,the alkalifying temperature,the concentration of Artemisia glue,the mol ratio of NaOH and Artemisia glue (alkalified reaction phase),the etherification time,the etherification temperature,the volume fraction of alcohol,the mol ratio of chloroacetic acid and Artemisia glue,the mol ratio of NaOH and Artemisia glue (etherification reaction phase) were also studied.The most optimal process condition of the preparation of carboxylmethyl Artemisia glue was determined by orthogonal test:the alkalifying time 1.5h,the etherification temperature 35℃,the concentration of Artemisia glue 40g/L ,the mol ratio of NaOH and Artemisia glue 1∶1, the etherification time 3h,the etherification temperature 60℃, the volume fraction of alcohol 75%, the mol ratio of chloroacetic acid and Artemisia glue 0.6∶1,the mol ratio of NaOH and Artemisia glue 0.7∶1.Under these conditions,the DS of carboxylmethyl Artemisia glue was 0.4982,reaction efficiencyion was 83.03%.Due to the introduction of carboxylmethyl group, the content of water-insoluble components decreased from 56.02% to 15.01% and the rate of water absorption increased from 13.02% to160.08% as the DS of carboxylmethyl Artemisia glue was 0.4982.Carbxylmethyl Artemisia glue was a kind of thixotropy.Apparent viscosity increased with the increase of concentration.And its apparent viscosity decreased with the increase of temperature.When the pH increased,the apparent viscosity increased firsly and then decreased.The NaCl made the apparent viscosity of carbxylmethyl Artemisia glue decreased and the sucrose affected the apparent viscosity smoothly.Besides,there were three strong peaks appeared in 1730cm-1, 1382cm-1and 1254cm-1 in the Infra-red spectrometris of arbxylmethyl Artemisia glue,it indicated that the arbxylmethyl Artemisia contain -C=O,-CH2 and -C-O.So the differences of the Infra-red spectrometris of Artemisia glue and carbxylmethyl Artemisia glue showed that the carboxylmethyl group had been inserted into Artemisia glue.The carboxylmethyl group introduced gave Artemisia glue some new character, so it could be used in quick-frozen dumpling.When the carbxylmethyl Artemisia glue was used inside of dumpling,the optimum condition was as follow: the DS of carboxylmethyl Artemisia glue 0.4982,the content of carboxylmethyl Artemisia glue 0.2%.In this condition the frost shattering rate decreased 17.14%.When the carbxylmethyl Artemisia glue was used in the skin of dumpling,the optimum condition was as follows: the DS of carboxylmethyl Artemisia glue 0.4982,the content of carboxylmethyl Artemisia glue 0.2%0.25%. In this condition the frost shattering rate decreased 42.85%.
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