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采用反相乳化法制备了以烷基糖苷(APG)为乳化剂的高效氯氟氰菊酯水乳液。测定了药液的动、静态表面张力、接触角以及在香蕉叶片上的持留量和药物吸附量,考察了胆固醇改性海藻酸钠衍生物(CSAD)对载药水乳液在叶片上的润湿性和沉积量的影响。结果表明:室温下,CSAD+APG体系和APG单独体系稳定的水乳液中表面活性剂(APG)的临界胶束质量浓度均为0.1 g/L。当ρAPG=0.1 g/L时,两种体系药液的最大持留量分别为0.010 4和0.007 8 g/cm2,粘附张力分别为24.32和16.14 m N/m,粘附功分别为55.23和46.47 m N/m;在叶片上的药物吸附量分别为524和412μg/L。由此推断:两亲性嵌段聚合物CSAD是通过疏水作用与APG形成混合胶束吸附在固液界面,其有效地提高了药液在叶片上的持留量和药物吸附量。
The reverse phase emulsification method was used to prepare allyl cypermethrin aqueous emulsion with alkyl glycoside (APG) as emulsifier. The dynamic and static surface tension and contact angle of the liquid were measured. The retention and the amount of drug adsorbed on the banana leaves were measured. The wettability of CSAD on the leaf surface of the loaded emulsion was investigated. And the amount of deposition. The results showed that the critical micelle concentration of surfactant (APG) in CSAD + APG system and APG alone system was 0.1 g / L at room temperature. When ρAPG = 0.1 g / L, the maximum retention capacity of the two systems was 0.010 4 and 0.007 8 g / cm2, the adhesion tension was 24.32 and 16.14 m N / m respectively, and the adhesion work was 55.23 and 46.47 m N / m; the amount of drug adsorbed on the leaves was 524 and 412 μg / L, respectively. It is inferred that the amphiphilic block copolymer CSAD is formed by the hydrophobic interaction with APG to form mixed micelles adsorbed on the solid-liquid interface, which effectively increases the retention of liquid on the leaf and the amount of drug adsorbed.