A number of the components of the tissues contain in their molecules either phosphoric or sulfuric acid. The phosphoric acid radicle is contained in the monoand polynucleotides, and the sulfuric acid radicle in chondroitinand mucoitin-sulfuric acids. In all these compounds the acid radicle is linked in ester form to either a carbohydrate or a polyhydric alcohol. On long acquaintance with substa...

Cellulose hydrolysis to glucose using a heterogeneous catalyst is necessary step in producing bio-based chemicals and polymers. The requirement for energy-intensive pretreatments, such as ball milling, increase the reactivity of cellulose one major issues this area. Here, we show that by solvent-assisted adsorption pretreatment step, can be adsorbed on surface carbon catalyst. For pretreatment,...

formaldehyde in small quantities is commonly analyzed by spectrophotometric methods. one of the most-commonly used spectrophotometric techniques for this purpose is based on the reaction with chromotropic acid. because of its simplicity, sensitivity, selectivity and its low cost, it is still widely used. investigations for replacing the concentrated sulfuric acid with other acids or using more ...

<strong>ABSTRACT. </strong>Bioethanol is an alternative energy sourced from environmentally friendly raw materials wastes that contain a lot of lignocellulosic such as HVS paper. Paper contains about 85% cellulose, 8% hemicellulose, 5% lignin and the rest in form ash compounds. Bioethanol ethanol produced fermentation glucose (sugar) followed by distillation process. This study aims...

Recent studies suggest that dimethylamine could be a key ternary species in the formation and early growth of atmospheric aerosol particles. We report on nucleation studies for the ternary system of sulfuric acid, water and dimethylamine which have been performed at the CERN CLOUD chamber. These studies were conducted at atmospherically relevant concentrations of sulfuric acid and dimethylamine...

Pretreatment is among the most costly steps in the overall biological conversion of cellulosic biomass to fuels and chemicals. Pretreatment also has a profound effect on all other operations from choice and preparation of feedstock all the way to final product recovery and use of process residues. Yet, because cellulosic biomass is naturally resistant to breakdown to release the sugars containe...

Halloysite (HNT) is treated with sulfuric acid and the physico-chemical properties of its morphology, surface activity, physical and chemical properties have been investigated when HNT is exposed to sulfuric acid with treatment periods of 1 h (H1), 3 h (H3), 8 h (H8), and 21 h (H21). The significance of this and similar work lies in the importance of using HNT as a functional material in nanoco...

An efficient and green protocol for the synthesis of αaminonitriles derivatives by one-pot reaction of different aldehydes with amines and trimethylsilyl cyanides has been developed using natural alumina, alumina sulfuric acid (ASA), nano-γ-alumina, nanoalumina sulfuric acid (nano-ASA) under microwave irradiation and solvent-free conditions. The advantages of methods are short reaction times, h...

The integral valorization of potential sugars (cellulosic and hemicellulosic) from spent coffee grounds (SCG), a lignocellulosic residue, is proposed in this work. With aim, the microwave assisted dilute sulfuric acid pretreatment has been optimized, leading to hemicellulosic sugar recovery liquid (HSRL) an enzymatic hydrolysis yield 79 98%, respectively, at 160.47 °C 1.5% H2SO4. Moreover, comp...