the purpose of this study was to determ the degree, level and capacity indices of agricultural mechanization in sarab region (n: 37º45', e: 47º30') in eastern azarbayjan province, comprising about 65,164 hectares of farming land. the number of tractors, types of machines, and degree, level, and capacity of mechanization were calculated as the method of study. data showed that the average level ...

In this work an optimization of the solvent-free acetylation of cellulose with acetic anhydride under microwave heating with iodine as a catalyst was performed. The optimized parameters included the microwave irradiation power from 300 W to 800 W, the reaction time between 5 to 40 min, the reaction temperature from 80 to 130 degrees C, and the amount of iodine from 1 to 15 mol%. The extent of t...

Chitin is one of the most abundant biopolymers in nature. Herein, we report successful preparation chitin nanofibers (ChNFs) from shrimp shell waste using a partial deacetylation process with NaOH and high-speed blending. The effects reaction concentrations (0–40 wt%) on degree acetylation (DA), crystallinity, zeta potential, thermal stability, morphology ChNFs were investigated. With more aggr...

Abstract Acetylation is a method of chemically modified starch that can be used to improve the physicochemical properties starch. The aim study was obtain pH and concentration acetic anhydride which gave best effect on characteristics acetylated sago arranged using completely randomized design with factorial pattern in combination suspension 7.0; 8.0; 9.0 10.0 concentrations 3%, 6%, 9%, 12% 15%...

The physicochemical nature of chitin and chitosan, which influences the biomedical activity of these compounds, is strongly related to the source of chitin and the conditions of the chitin/chitosan production process. Apart from widely described key factors such as weight-averaged molecular weight (MW) and degree of N-acetylation (DA), other physicochemical parameters like polydispersity (MW/MN...

This work describes the obtention of chitin and chitosan from brown shrimp exoskeleton (Farfentepenaeus californiensis), which is collected Gulf California. The isolation process was carried out by a consecutive treatment that includes demineralization deproteinization. On other hand, preparation conducted through alkaline hydrolysis, product purified using membrane filters series to homogenize...