氧化魔芋葡甘聚糖—大豆分离蛋白基空心胶囊囊材研究
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摘要
本文以天然植物多糖魔芋葡甘聚糖、大豆分离蛋白为原料,通过化学改性合成一种成膜性好的材料,并将其应用于空心胶囊囊材。主要研究内容如下:
     1、对魔芋葡甘聚糖进行氧化改性,并测定溶胶的粘度和成膜后膜的力学性能、阻湿性能和阻气性能等指标。结果表明,氧化最佳反应条件为:2.4%H2O2(v/v),50℃反应5h,膜的拉伸强度为15.38MPa,断裂伸长率为18.7%,吸湿增重为23.41%,透湿系数为9.0×10-9g·cm/cm2·s·Pa,膜的综合性能较KGM有较大提高。氧化后分子链断裂,分子量降。通过激光光散射检测其重均分子量为2.889×105 g/mol,较KGM下降了70.5%。
     2、对氧化魔芋葡甘聚糖与大豆分离蛋白进行交联改性,制备出一种新的材料氧化魔芋葡甘聚糖-大豆分离蛋白,确定最佳反应条件为:氧化魔芋葡甘聚糖:大豆分离蛋白(w/w)=2:1,PH=7,交联剂使用量为4%干粉重,反应温度60℃,反应时间为2h。膜的拉伸强度为34.56MPa,断裂伸长为20.85%,吸湿增量为7.25%,透湿系数为1.64×10-9g·cm/cm2·s·Pa,试验表明,改性产物膜性能较魔芋葡甘聚糖膜、氧化葡甘聚糖膜有较大改善,适于作为空心胶囊囊材。
     3、对氧化魔芋葡甘聚糖-大豆分离蛋白进行表征。运用流变仪、红外光谱、扫描电镜、差示扫描量热仪表征改性材料的结构及形态。结果表明,氧化葡甘聚糖与大豆分离蛋白在交联剂作用下发生反应生成新的物质,且改性产物的溶胶流变特性较魔芋葡甘聚糖、氧化魔芋葡甘聚糖都有较大提高。材料的成膜性、流变性和热稳定性都明显改善,符合作为空心胶囊囊材的要求。
     4、对氧化葡甘聚糖-大豆分离蛋白进行急性毒性试验,LD50>3.6 g /kg BW,初步判断该改性产物是安全的。
     5、以氧化魔芋葡甘聚糖-大豆分离蛋白为原料,辅以助凝剂卡拉胶,按传统的工艺方法制备出植物空心胶囊。依照中国药典对胶囊的性能进行检测,均符合药典标准。
     6、检测了胶囊的稳定性。通过高温试验,吸湿性试验证明胶囊具有一定的稳定性。其吸湿性明显于现有明胶空心胶囊。
The studies on property of natural konjac glucomannan(KGM) and soy protein isolate (SPI) from chemical modification were carried out in this thesis.It was used for the material of vacant capsules.Main research results were as follows:
     1. The oxidization conditions of konjac glucomannan were investigated .The viscosity of OKGM gum and film properties of mechanics, moisture resistance and gas barrier were tested. The results indicated that the optimal condition were as follows:2.4% (v/v)H2O2, at 50℃and 5 hours reaction.The tensile strength and elongation rate of oxidized konjac glucomannan (OKGM) film were 15.38MPa and 18.7% respectively, and the moisture absorption of OKGM film was 23.41% ,humidity-penetrate coefficient was 9.0×10-9g·cm/cm2·s·Pa. Molecular chain was degradated and the molecular weight was reduced after oxidization.The weight-average molecular weight(MW) of OKGM was tested by using the laser light scattering.It was 2.889×105g/mol which reduced 70.5% compared with KGM.
     2. The modified film was prepared from oxidized konjac glucomannan and soy protein isolate.The optimal conditions were as follow:OKGM:SPI(w/w) = 2:1, PH=7, 4% sodium polyphosphate, at 60℃and 2 hours reaction.The tensile strength of the film was 34.56Mpa,The elongation rate of blend film was 20.85%,The moisture absorption of blend film was 7.25% and the humidity-penetrate coefficient of blend film was 1.64×10-9g·cm/cm2·s·Pa。The properties of film were improved markedly compared with KGM and OKGM film ,which was suitable for materials as vacant capsules.
     3. The structure of the modified films was characterized by using rheometer ,Fourier transform infrared spectrum(FT-IR),scanning electron microscope(SEM),and differential scanning calorimeter(DSC) The results indicated that there were strong interactions between OKGM and SPI, OKGM and SPI can be crosslinked to form new material. Film-forming, rheology and thermal stability of the material are markedly improved, which was feasible for vacant capsules materials.
     4. The acute oral toxicity of OKGM-SPI was tested, LD50>3.6g /kg BW , the product was safe.
     5. The quality of the capsules made from OKGM-SPI was tested based on Chinese Pharmacopoeia, it was qualified.
     6. The moisture absorption and stability of capsules were investigated. The results indicated that capsule was stable. Moisture absorption was significantly lower than its existing gelatin capsules.
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