Alkali treatment of natural fibers is one the chemical treatments used to increase exposed cellulose content through removal hemicellulose and lignin on fiber surface. This study aims investigate effect alkali physical mechanical properties lantung fibers. The materials in this research consist of: (Artocarpus elasticus) with an process using 4% 6% natrium hydroxide (NaOH) solutions immersion t...

Sequential treatments of dewaxed Calamagrostis angustifolia Kom with water (60 oC and 90 oC), 70% ethanol, and 70% ethanol containing 0.2%, 1.0%, 2.0%, 4.0%, and 8.0% NaOH at a solid to liquid ratio of 1:25 (g/mL) at 80 oC for 3 h yielded 36.2% soluble polysaccharides of the dry dewaxed material. The eight polysaccharide fractions obtained were comparatively studied by sugar analysis, GPC, FT-I...

Cattle manure usually contains a proportion of carbohydrates in the form organic residues from incompletely digested feed and farm husbandry practices. These are not available for biogas production due to long fermentation time. This paper investigates optimal application alkali, NaOH KOH mechanical pre-treatments improve degradation lignocellulosic content potential yields local Bavaria, Germa...

Activation of the neutrophil respiratory burst by the supernatant fraction from an alkali-treated collagen preparations (SAC) was enhanced by longer durations of exposure to alkali (1 N NaOH for 0.5-24 hr). The concentrate obtained from ultrafiltration (greater than 30,000 molecular weight) of SAC (1 N NaOH for 24 hr) retained the stimulatory factor. Fractionation of this ultraconcentrate by hi...

Fresh-harvested, air-dried rice straw was pretreated at a water content of 5 g H(2)O/g straw using sodium hydroxide (NaOH) and compared to pretreatment at 10 g H(2)O/g straw by hydrated lime (Ca(OH)(2)). Full factorial experiments including parallel wash-only treatments were completed with both sources of alkali. The experiments were designed to measure the effects of alkaline loading and pretr...

We examined the effects of polyphenols on the analysis of lignin by histochemical methods, namely, the Mäule color reaction coupled with microspectrophotometry and ultraviolet microspectrophotometry, in wood of Eucalyptus camaldulensis and E. globulus. Thin sections and wood meals were extracted with solutions of alkali at different concentrations. The amounts of alkali-soluble extractives incr...

Natural fibres have recently become an attractive alternative to synthetic in the implementation of polymer composite structures. Inherent flaws within natural terms their constituent contents (hemicellulose, cellulose, and lignin) reduce compatibility these with matrices. In this study, effects chemical treatments on hemp resulted polyester matrix are investigated. The were treated alkali (0–1...

Abstract Pectin from two different plant sources: apple and sugar beet was studied. Apple pectinwas modified by chemical treatments such as: acid, alkali and ammonia, so as to obtain an ester levelequal to or less than 50 %, which is described as low methoxyl (LM) pectin. LM pectin form gelswith significant characteristic. In this study, de-esterification of apple pectin with acid treatmentresu...

The present investigation aims at studying the effectiveness of alkali-assisted ultrasonication on pretreatment of garden biomass (GB). Dry and powdered GB suspended in 1% NaOH was ultrasonicated for 15, 30 and 60 minutes at a frequency of 25 KHZ. The mode of action and effectiveness of alkali-assisted ultrasonication on GB was established through microscopic, scanning electron microscopic and ...