Refining of industrial lignin to produce homogeneous fractions is essential for high-value applications. However, the understanding key interactions between a variety solvents with polymer still uncertain. In this work, single-step fractionation hardwood kraft (HKL) using organic different polarities – ethanol, acetone, diethyl ether and hexane was investigated by combining an experimental theo...

Kaolinite supported bimetallic Pt-Sn catalysts were prepared via impregnation technique using different solvents, water, ethanol and acetone. The catalysts were characterized by X-ray diffraction pattern and temperature programmed reduction techniques. Surface area and pore size distribution were determined by nitrogen physisorption technique. The activities of the catalysts were measured towar...

Here, a silicon nanopillar array (Si-NPA) was fabricated. It was studied as a room-temperature organic vapour sensor, and the ethanol and acetone gas sensing properties were detected with I-V curves. I-V curves show that these Si-NPA gas sensors are sensitive to ethanol and acetone organic vapours. The turn-on threshold voltage is about 0.5 V and the operating voltage is 3 V. With 1% ethanol ga...

This study evaluated the effect of organic solvent (acetone or ethanol) on the microtensile bond strengths (MTBS) of an adhesive system applied to dry and moist dentin. Sixteen extracted human third molars were ground to expose a flat occlusal dentin surface and acid etched for 20 seconds (20% phosphoric acid gel, Gluma Etch 20 Gel, Heraeus/Kulzer). After rinsing the acid etchant, an ethanol-ba...

The question whether pyruvic acid holds a key position as an intermediate in the butanol-acetone fermentation by Clostridium acetobutylicum (Weizmann) similar to that in the alcoholic fermentation by yeast and in glycolysis by muscle has, so far, not received a decisive answer. This is mainly due to the inconsistent results obtained by different workers in this field. As in the case of corn-mea...

OBJECTIVE To screen the anti-tumor fraction of ethanol extracts from Thymus quinquecostatus Celak and investigate its anti-tumor effect on human leukemia cell line. METHODS Ethyl acetate, n-butanol and acetone fractions were separated from the ethanol extracts of wild Thymus quinquecostatus Celak. Growth inhibiting effects of these extracts on human leukemia cell lines K562 and HL-60 were det...

Felicia muricata is a medicinal plant used for the management of different human and livestock diseases in the Eastern Cape Province of South Africa. The antioxidant potential of the leaves from this herb was investigated using its water, methanol, acetone and ethanol extracts. All the extracts were rich in phenols, proanthocyanidins and flavonols but low in flavonoids. The water extract exhibi...

The subject handled in this study is the determination of antioxidant activities of extracts obtained from the Urginea maritima (L.) Baker plant’s leaves and tubers. Extractions which were obtained using various solvents as methanol, ethanol, acetone and benzine. The antioxidant activity of the extracts was determined using β-karotene-linoleic acid system. Moreover, the free radica...

The residues obtained after hydrodistillation of three aromatic plants (Calamintha grandiflora, Myrrhis odorata and Tussilago farfara) were separated into solid and liquid fractions. The liquid fraction was dried while the solid fraction was extracted with acetone, methanol or ethanol. Two main types of antioxidant activity tests were employed: i) assays to evaluate oxidation of fats, oils and ...

BACKGROUND Several plants traditionally used in treatment of a variety of infections in South Africa are reported in ethnobotanical surveys. Many of these plants including Ziziphus mucronata subsp. mucronata lack scientific reports to support their medicinal importance. METHODS The antioxidant activities and phenolic contents of the acetone, ethanol and aqueous extracts of the stems of Z. muc...