Retinoic acid (vitamin A acid) (I) has long been recognized as one of the most interesting members of the retinoid family (1). A quantitation method of I was proposed by KAWASAKI et al. who estimated an absorptivity of coloration developed by 74% sulfuric acid (2). The color was found to be stable in sulfuric acid, persisting for several hours at room temperature, so they used the method for as...

The catalytic layers of a low temperature fuel cell must present a sufficient electronic conductivity for a high overall performance and, in this sense, the electrocatalyst support plays an important role. However, regarding carbon nanofibers as support, it is necessary to chemically treat their surface to improve both metal deposition and anchorage, which unfortunately affects negatively the e...

Abstract The study was conducted to extract zinc and the results on extraction of Zn from sublime with solution sulfuric, thermal phosphoric acids are presented depending Solid: Liquid (S:L), concentration duration leaching process. Sulfuric acid used a content 8% which is waste product non-ferrous metallurgy, phosphorites Central Kyzylkum. It has been established that maximum degree noted when...

Although concentrated sulfuric acid saccharification is not a novel method for breaking down lignocellulosic biomass, the process by which saccharification affects biomass decomposition, sugar recovery, and by-product generation is not well studied. The present study employed Taguchi experimental design to study the effects of seven parameters on corn stover concentrated sulfuric acid saccharif...

Furfural derived from pentose sugars is one of the key reactive intermediates for production of hydrocarbons from cellulosic biomass for use as drop-in fuels. Simultaneous extraction into a solvent immiscible in water can substantially enhance furfural yields by removing it from the aqueous environment where the yield would otherwise be limited by its rapid degradation to chars and other carbon...