Optimization of Citric Acid Extraction from Dark-plum with Response Surface Methodology Assisted by Shock Extraction and Its Application in the Dyeing of Day Lily
This study aims to optimize the process of oscillating extraction of citric acid from dark-plum and study its coloring effect on day lily.The content of citric acid was determined by high-per-formance liquid chromatography.Using the total content of citric acid as the index,based on the results of single-factor experiments(time,temperature,oscillation frequency,and material-to-liquid rati-o),the Box-Behnken design-response surface method was used to optimize the extraction process,and the extract of dark-plum was applied to the coloring of day lily.The results showed that the opti-mal extraction process of dark-plum was at a temperature of 60 ℃,an extraction time of 60 min,an oscillation speed of 261 r/min,and a material-to-liquid ratio of 0.067.Under these conditions,the yield of citric acid from dark-plum could reach 17.5％,with a relative error of 1.44％compared with the model prediction.The optimized process conditions were practical and reliable.The coloring experi-ment of day lily showed that the coloring effect of dark-plum extract with a citric acid concentration of 3.4％-8.5％was better on water day lily.In conclusion,the oscillating extraction method for extrac-ting citric acid from dark-plum is simple and has a high yield.The extract exhibits good coloring effects,providing a certain reference for further research and application development of citric acid from dark-plum.
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维普
