Study Of Preparation And Properties Of Alkyl Polyglycosides Sulfate Of Algae

The alkyl polyglycoside produced from carbohydrates and their hydrolysates is a new kind of surfactant, which is nontoxic and less irritant to human skin and eyes.Besides the qualities of general surfactants,alkyl polyglycoside as a green surfactant is biodegradable and thus benign to the environment.The research of alkyl polyglycoside and its derivatives is becoming the focus of many international studies and researches.In this paper,polysaccharides of Porphyra haitanensis from Fujian Province were extracted. Alkyl polyglycoside sulfate(APGS), a kind of alkyl polyglycoside derivative, was produced from polysaccharides of Porphyra haitanensis through two-step method. The process for preparation of APGS was studied in detail.Prime conditions of synthesis of APGS was fixed. The physical and chemical properties of APGS were also discussed.1. Polysaccharides of Porphyra haitanensis were extracted in boiling water,removed from proteins by Sevag's means. Its composition was analyzed by thin-layer chromatography and IR spectrum.The contents of total sugar,galactose, 3,6-anhydro-galactose(3,6-AG) and sulfate were measured by chemical methods.2. Polysaccharides of Porphyra haitanensis and aliphatic alcohol were used for the synthesis of APGS. The invert rate of polyglycosides was used as the guideline and the reaction temperature, amount of catalyst, polysaccharides/ aliphatic alcohol ratio and the time of reaction were used as the restriced factors. The optimal reaction conditions were confirmed by L9(34). The optimal temperature was 118℃, the amount of catalyst 2%, the polysaccharides/ aliphatic alcohol ratio 6:1 and the total timeof reaction was 3 hours.3.The solubility, surface tension, critical micelle concentration(CMC), hydrophilic-lipophilic balance(HLB) value, emulsifying capacity and foamproperty of APGS were measured.The structure of APGS was analyzed by the means of IR spectrum.This study provided a new approach to exploit Porphyra haitanensis and to produce polysaccharides sulfated. It also provided the necessary scientific evidences and laid an experimental foudation for the further research of the application of polysaccharides sulfated.