Abstract The goal of this study was the immobilization different lipases as protein-coated microcrystals on K 2 SO 4 and their uses in synthesis isoamyl acetate n-hexane medium. optimum conditions, such lipase variety, temperature, initial molar ratio vinyl acetate/isoamyl alcohol, immobilized amount, reaction time were determined. highest conversion obtained when Thermomyces lanuginosus (TLL-P...

• It has been proposed by some that lack of physical exercise may be an important factor in the occurrence of coronary inadequacy of various types. Recently, Tepperman and Pearlman x developed a technique for estimating the size of the coronary tree in the rat from the weight of a vinyl acetate cast of the tree. Using this technique they observed that swimming for a period of 30 minutes twice d...

A native potato starch was modififi ed with vinyl acetate by graft polymerization in alkaline medium pH 10 the mode of temperature change from 70 to 80°C for 4 hours. The initiator process ammonium persulfate (NH ) 2 S O 8 . conversion 91,5%. chemical structure copolymer (Starch:Vinyl acetate) confifi rmed IR-spectroscopy. Composite materials and triethyl citrate tensile strength 24 MPa were ob...

This paper focuses on the effect of okra bast fillers biodegradation poly(vinyl alcohol) composites. Fibers were obtained from plant stems via biological degumming and subjected to different chemical treatments such as scouring, alkalizing, maleic anhydride treatment, vinyl acetate grafting. The fibers ground PVA-okra filler composites produced at 20 wt% fiber load solution casting method. test...