Volume-5 ~ Issue-6

Abstract: Bio-composite made from a combination of natural fibers such as wood fiber (wood hard or soft) or other fibers (fiber grain, flax, sisal and hemp) in a polymer matrix. In this study, natural fibers such as cellulose synthesized from Meranti wood (KM) and Betung bamboo (BB) as a matrix or reinforcement material poly lactic acid (PLA) are biodegradable. Tensile and flexible strength tests carried out using Universal Testing Machine (UTM). Flexible and tensile tests that bio composite Betung bamboo better than Meranti wood. Apparently the flexion strength of the composite KM between 10% and 20% there was no significant difference, In contrast to the composition of the bio composite between 10% and 20%. Flexion strength has height values contained in the bio composite Betung Bamboo 20% of 57.4054 N/mm2. The highest power of elasticity found in the composition of the bio composite Betung bamboo 20% of 1.95 GPA. Betung bamboo is high strength reinforced silica matrix composite.

Keywords: Bio composites, poly lactic acid, Meranti wood, Betung bamboo

[1] Zimmerman, T., Pohler, E., Geiger, T. "Cellulose fibrils for polymer reinforcement. Advanced Engineering Science", Advanced Engineering Material, Vol. 6(9), pp.754-761, 2004.

[2] Abe K, Iwamoto S, Yano H, "Obtaining cellulose Nano fibers with a uniform width of 15 nm from wood", Bio macromolecule, vol.8, pp.3276-3278, 2007.

[3] Esmeralda U.L, Maria Gabriel, Victor Geraldo, Alejandra, "Determination of mechanical properties of Biodegradable Composite made by Pine Resin Corn Fibers and Henequen Fiber" Engineering Material, Vol. 517, pp. 422-429, 2012.

[4] Abdurahim, M. 1986. Wood description. Department of Forestry Agency for Forestry and Development Forest Product Research Development Centre. Bogor Indonesia. Hal 81-87

[5] Rafael Auras, Leong Tak Lim, Susan Em Seiko, Hideto Tsuji, "Poly lactic acid: synthesis, properties and processing application". Willey, ISBN 8780770293669, 2010.

[6] Pandey, K. Raghunatha Reddy, A. Patheep Kumar, P.P Sing, "Degradability of polymer composite from renewable resources" , International journal of Polymer Degradation and Stability, elsivier, vol 88, pp.234-250, 20005

[7] Paul A Fowler, J Mark Hughes, and Robert M Elias, " Bio composites: technology, environmental credentials and market forces". Journal of the Science of Food and Agricultural, vol 86, pp. 1781-1789, 2006.

[8] Suryanegara, L., Nakagaito, A.N., Yano, H. The effect of crystallization of PLA on the thermal and mechanical properties of micro fibrillated cellulose- reinforced PLA composites. Composites science and Technology 69:1187-1192, 2009.

Abstract: Simple and novel spectrophotometric method is described for simultaneous determination of aluminium and iron. The method is based on the metal ions - complexes formed by aluminium and iron with mixed chromogenic reagents of 1, 10 phenanthroline and 8-hydroxyquinoline (oxine). The derivatives have absorption maxima at 400 nm and 510 nm respectively in the presence of cetyltrimethyl ammonium bromide (CTAB) as micellar media (surfactant) maintained at pH 5. Reaction conditions were optimized and the linear dynamic ranges for determination of aluminum and iron were found be 0.8 – 12.0 μg/mL and 0.6 – 8.0 μg/mL respectively. The standard deviation (S.D) and coefficient of variation (CV) for the simultaneous determination was 0.018 and 0.45% for aluminium and 0.03 and 1.5% for iron (II). The recoveries were between 102 % and 106 %, 101.2 % and 104 % for aluminium and iron respectively at 95 % confidence level (p≥0.05). The proposed method was successfully applied to the assay of aluminium and iron in rock minerals, lubricating oil and water samples. The results and paired t-test for the analyzed samples were found to be in satisfactory agreement (shows no significant difference) with those acquired by the flame atomic absorption spectrophotometric (FAAS) technique.

Keywords: Aluminum, Chromogenic reagents, Iron, Micellar media, spectrophotometry.

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Abstract: The present study aimed to extract and purify the compound of Secoisolariciresinoldiglucoside oligomers (lignan) from flax seed (Linumusitatissimum) and its antioxidant activity. The Lignan was extracted by solvents which gave the best results were ethanol : 1,4 dioxane (1:1, v:v).SDG release after alkaline hydrolysisby using a methanolicNaOH , 20 mM, pH=8 at 50 ºC.followed by using following chromatographic techniques: Liquid-liquid, Sephadex LH-20 column chromatography, thin layer chromatographic (TLC), high performance liquid chromatographic (HPLC) and Fourier Transform Infra-Red(FTIR) . The EC50 values of Pure lignan extract (9 μg/ml) was shown possess DPPH radical scavenging activity compared to reference substances BHT and vitamin C (EC50= 3 and 4.2 μg/ml) respectively, and this was higher than partial pure lignan component (EC50= 25.5 μg/ml).The total phenolic content of the pure lignanwas higher than partial pure lignan which gave 22.312 and 14.85 g/ml respectively.

Key words: Lignan, flax seed, antioxidant activity, Sephadex LH-20, total phenolic

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