Microwave assisted green synthesis of guar gum esters with enhanced physico-chemical properties

Abstract

Several methods have been developed for the modi cation of natural polymers.Most of the reported methods are expensive, since the chemical reactions are carried out using chemical additives along with stabilizers. Microwave-assisted synthetic strategies have gained signi cant importance in the synthesis of materials due to their eco-friendly nature. Guar gum is one of the important naturally occurring non-ionic polysaccharides, which has incredible industrial and commercial applications. A rapid method for protecting the hydroxyl group in sterically hindered gum was developed by Microwave-Assisted Synthesis (MAS). An e cient synthesis of di erent novel guar gum derivatives such as acetate, butyrate, and propionate (GG1-GG3) was performed. Signi cantly higher yield of ester was achieved after 15 min at 600 W using iodine as a reaction promoter. Gum ester formation was carried out at various concentrations for di erent reaction intervals. The synthesized products were characterized using FTIR, NMR, and SEM techniques. The e ciency of the adopted synthesis method was evaluated based on swelling ratio, gelation ability, and solubility. The study indicated that the guar gum could be modi ed using acid anhydride under microwave irradiation with enhanced physic-chemical properties. Moreover, microwave modi cation is an eco-friendly approach.

Estimation of Mineral Composition, Antioxidant, Antimicrobial, Biofilm Activity and HPLC Profile of <i>Halothamnus auriculus</i>

“…The most common infection and drug resistant strains are Staphylococcus aureus, Pseudomonas aeruginosa and Acinetobacter baumannii. These clinical drug-resistant strains have become difficult to treat and there is a need to search out for safe and reliable antibacterial substances [2,[7][8][9][10][11][12][13][14].…”