نتایج جستجو برای: humin
تعداد نتایج: 158 فیلتر نتایج به سال:
Chromatographic analysis of the carbohydrates extracted from the mammary gland of rats showed, besides the spots of glucose and lactose, those of two other carbohydrate derivatives (1). Malpress and Morrison (2) and Reithel et al. (3) have found components of similar chromatographic behavior in the mammary gland of guinea pigs. Also, in the extracts of a lactose-requiring strain of Lactobacillu...
Soil organic matter from the surface horizon of two Brazilian soils (a Latosol and a Chernosol), in bulk samples (in situ SOM) and in HF-treated samples (SOM), was characterized by elemental analyses, diffuse reflectance (DRIFT) and transmission Fourier transform infrared spectroscopy (T-FTIR). Humic acids (HA), fulvic acids (FA) and humin (HU) isolated from the SOM were characterized additiona...
Alteration of the composition of soil organic matter (SOM) in Inner Mongolian grassland soils associated with the duration of grazing exclusion (GE) has been considered an important index for evaluating the restoring effects of GE practice. By using five plots from a grassland succession series from free grazing to 31-year GE, we measured the content of soil organic carbon (SOC), humic acid car...
An investigation was carried out into the hydrolysis of cellulose dissolved in 1-ethyl-3-methylimidazolium chloride ([Emim][Cl]) and 1-butyl-3-methylimidazolium chloride ([Bmim][Cl]) catalyzed by mineral acids. Glucose, cellobiose, and 5-hydroxymethylfurfural (5-HMF) were observed as the primary reaction products. The initial rate of glucose formation was determined to be of first order in the ...
A class of organic molecules extracted from atmospheric aerosol particles and isolated from fog and cloud water has been termed HUmic-LIke Substances (HULIS) due to a certain resemblance to terrestrial and aquatic humic and fulvic acids. In light of the interest that this class of atmospheric compounds currently attracts, we comprehensively review HULIS properties, as well as laboratory and fie...
Soil organic matter (SOM) plays an important role in maintaining soil productivity and accounting for the promotion of biological diversity. The main components of the SOM are the humic substances which can be fractionated according to its solubility in humic acid (HA), fulvic acids (FA) and humin (HU). The determination of the chemical properties of organic matter as well as its interaction wi...
5-Hydroxymethylfurfural (HMF) is one of the promising chemicals, which can serve as a platform chemical to produce various energy chemicals. HMF be produced from different lignocellulosic biomass derived sugars employing catalytic processes. In this study, synthesis was investigated excessively available sucrose using environment friendly and cost-effective technology. Among solvents applied, d...
The processing of biomass in ionic liquids has demonstrated many benefits compared to organic solvents. This includes the maximization 5-hydroxymethylfurfural (HMF) yield from sugars through suppression byproducts, such as formic acid and levulinic acid. Inefficiencies still exist due low stability HMF at high temperature, leading side reactions which ultimately result undesirable formation hum...
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