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Outline
Under the guidance of condensed matter theory, calcium salt cross-linking is used to prepare moisture-resistant intermediates of Yuzhu (Polygonatum odoratum) polysaccharide, reduce its hygroscopicity, improve moisture resistance and provide new methods for moisture-proofing of traditional Chinese medicine extracts.
Single-factor experiment investigated the effects of cross-linking agent type and dosage, polysaccharide concentration, stirring time, stirring speed and stirring temperature on moisture absorption rate of moisture-resistant intermediates, and used the response surface method to optimize the prescription and process. The equilibrium moisture absorption rate and critical relative humidity of moisture-proof intermediates were measured, and the glass transition temperature Tg was measured by differential scanning calorimeter (DSC), the microscopic morphology was observed by scanning electron microscope (SEM), and the rheometer was used to measure the apparent viscosity and viscoelasticity.
The type and dosage of cross-linking agent, polysaccharide concentration and stirring temperature all had significant effects on the moisture absorption rate of the intermediate. The optimal prescription and process were 5.0% calcium hydrogen phosphate, polysaccharide concentration 0.6 g/mL and stirring temperature 50 ℃. The evaluation results of moisture-resistant intermediates showed that the equilibrium moisture absorption rates of polysaccharides, polysaccharides+CaHPO4 and moisture-resistant intermediates were 22.87%, 18.44% and 15.04%, respectively, with critical relative humidity of 51.97%, 56.53% and 66.32%, respectively, and the values of Tg were 63.5 ℃, 68.5 ℃ and 80.0 ℃, respectively. SEM showed that moisture-resistant intermediates of Polygonatum odoratum polysaccharide had a large particle size and adhesions between the particles. The rheological analysis has found that the apparent viscosity of moisture-resistant intermediates of Yuzhu (Polygonatum odoratum) polysaccharide and the elasticity increased.
Traditional Chinese medicine extracts with polymers as the active ingredient can change their condensed state structure through cross-linking, thereby reducing hygroscopicity and improving moisture resistance.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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