No abstract

Optical resolution of racemic mixtures of arginine and alanine was performed by chiral selective nanofiltration membrane. The chiral selective layer of the membrane was prepared by interfacial polymerization of metaphenylenediamine, trimesoyl chloride, and S (-)-2-acetoxypropionyl chloride (S-2-actoxpcl) in situ on the top of polysulfone ultrafiltration membrane. S-2-actoxpcl consists of a chiral carbon atom that has an induced chiral environment in the membrane. The membranes were characterized by FTIR, scanning electron microscopy, and atomic force microscopy to establish a structure-performance relationship. The optical resolution was performed on the membrane testing module and the effect of process parameters was determined. The results indicated that the incorporation of S-2-actoxpcl made membrane chiral selective hence membranes performed optical resolution. The resolution capacity increased by increasing S-2-actoxpcl in polymerizing solution up to 0.03% but any increase beyond 0.03% reduces the resolution capacity. More than 92% enantiomeric excess of D enantiomer was observed in the permeate of the membrane which was prepared from 0.07% trimesoyl chloride and 0.03% S-2-actoxpcl. The membrane prepared without the chain terminator exhibited less volumetric flux but more solute rejection compared to those prepared with the chain terminator. The flux of the membrane increases as the amount of the chain terminator in the reaction increases.

The necessary element of non-public protecting instrumentation is mask. Mask is most necessary in pandemic as a result it safeguard our life by stopping the spreading of the Corona virus by entrapping the droplets from the corona affected person to enter wearer’s nose. There are different typed of mask like non- woven mask, reusable mask, N95 mask and artifact mask etc. Majority of business masks are non-woven masks that are created from polypropylene fiber. The most downside of non-woven masks is its discomfort and affect lack of breathability. This drawback is solved by utilizing natural fibers collectively of the material in non-woven and victimization them in mask. Bamboo fiber may be a natural celluloid fiber having smart comfort properties with antimicrobial properties. Bamboo fiber is also hydroscopic, natural deodorizer and hypoallergenic which provides good breathability and comfort. The polypropylene fiber is used with bamboo to provide good strength and abrasion property. Hence an attempt is made to develop a surgical mask from bamboo fiber with different blend ratios of 70:30, 60:40 and 50:50 of Bamboo and Polypropylene fiber to judge its mechanical properties like GSM and thickness potential as a protecting barrier material in non-woven face masks. The developed non-woven fabric of different blend is compared with each other, and the results shows 50: 50 blend has good mechanical properties, and the results show an effective value of Bacterial Filtration efficiency and Differential Pressure which are the most important parameters to predict the filtration efficiency of a surgical mask.