Study On Kinetic Modeling And Process Optimization Of Vacuum Freeze-drying Of Morinda Officinalis How

The medicinal plant Morinda citrifolia and its dry roots have long been used in medicine for the treatment of osteoporosis,depression,rheumatism and reproductive system protection.This article compares the effects of Morinda citrifolia vacuum freeze-drying,and explores the kinetic characteristics of Morinda citrifolia vacuum freeze-drying,establishes a mathematical model of the drying process,and analyzes the drying time,drying rate,and effective diffusion of Morinda citrifolia under different vacuum freeze-drying conditions.Coefficients and other drying characteristics provide a more effective and scientific method for improving the optimization of the processing and drying process of Morinda officinalis,provide a reference for the further comprehensive utilization and development of processing and storage technology of Morinda officinalis origin,and standardize the processing of the origin of Chinese medicinal materials Standards are important.The main research results are as follows:1.Comparative study on different drying methods of Morinda officinalis howThe comparative analysis results show that the vacuum freeze-dried Morinda citrifolia products have the best sensory quality and take a short time.Therefore,after this experiment,the differences of Morinda officinalis under different vacuum freeze-drying conditions and their effects on drying effect will be compared and studied.2.Study on drying kinetics and optimization of drying process in vacuum freeze-drying of Morinda officinalis howDuring the vacuum freeze-drying process of Morinda officinalis,under the same vacuum level,the effective diffusion coefficient is in the range of 2.23×10^-9～3.92×10^-9m²/s,the drying time is the shortest at 100pa,and the drying dynamics model fits the result It shows that at the vacuum level of 100pa,the Wang-Singh model has the best fitting effect and is the best process parameter.Under the same freezing temperature level,its effective diffusion coefficient ranges from 2.05×10^-9to 3.73×10^-9m²/s,and the temperature is at-60℃.The Page model shows its simulation advantages.Under the same material length,the effective diffusion coefficient ranges from 1.54×10^-9to 3.48×10^-9m²/s;the material with a length of1～2cm has the shortest drying time,and the Wang-Singh model has the best fitting effect.3.Analysis of water migration during vacuum freeze-drying of Morinda officinalis nuclear magnetic resonance technologyAccording to low-field MRI,the central part of Morinda officinalis has a relatively high moisture content,and the central part below the epidermis has a relatively low moisture content.In the vacuum freeze-drying process,it has a lower and lower free water content,which will eventually dry completely.In the initial drying period,the combined water content will continue to increase,and in the later period,the combined water content will continue to decrease.The water that is not easy to flow will have a lower and lower content,and eventually disappear completely.In the process of vacuum freeze-drying,there will be lower and lower T2 values of bound water,difficult-to-flow water and free water,and moisture will be tightly bound to non-aqueous substances.4.Comparison of active ingredients of Morinda officinalis vacuum freeze-dryingBy comparing and analyzing different vacuum degrees,the effective component index increases with the increase of vacuum degree,indicating that the effective diffusion coefficient of water has a certain effect on the content of the effective component index.The results show that under a vacuum of 200pa,the contents of polysaccharides,polyphenols,anthraquinones and iridoids are higher than those of natural drying and oven drying,which provides the choice of processing methods and optimization of process parameters for the production site of Morinda officinalis.data support.