Apiculata bark extracts as affected by 9 solvent

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Unformatted text preview: d that extraction solvents had significant effects on TPC, TFC, CTC and inhibition properties of extracts. A good correlation between CTC and inhibitive properties of R.apiculata bark extracts were revealed. IND-O6 STUDY OF INTERACTION BETWEEN ALKYL POLYGLUCOSIDE AND SODIUM LAURYL ETHOXYLATE SULPHATE IN A MIXED SURFACTANT SYSTEM Ng Siew Ling School of Chemical Sciences and Food Technology, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia E-mail: siew_ling_ng@hotmail.com Sodium lauryl ethoxylate sulphate (SLES) is a type of anionic surfactant found in conventional toiletry and personal care products for cleaning. This was synthesized from petrochemicals and less biodegradable compared to surfactants synthesis from natural products such as alkyl polyglucoside (APG). There was needed for finding a way to replace the SLES with an environmental friendly surfactant such as APG. The surface tension, critical micelle concentration (cmc) and the interaction between the nonionic surfactant, APG and anionic surfactant, SLES and their mixture in different molar ratio such as 4:1, 1:1, 1:4, 1:0 and 0:1 with and without addition of salt such as sodium chloride (NaCl) and calcium chloride (CaCl2) was prepared and tested with tensiometer KSV Sigma 703D. The cmc can be determined from the graph of surface tension against concentration and the factor investigated was effect of salt and the mixed surfactant. Addition of APG into SLES solution, regardless of the studied molar ratio, reduced the CMC value and surface tension. The most significant drop of CMC value was observed in 4:1 molar ratio which showed 0.89 mM that is 55.5 % lower than cmc value of SLES. However, it was found that the cmc obtained from the experiment deviate neg atively from the cmc predicted from ideal solution theory which sugests a higher tendency of mixed micelle formation . By employing the well known regular solution theory, interaction parameter, of this mixed surfactant system was determined. This study also showed that more signific...
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This note was uploaded on 02/17/2011 for the course CHEMISTRY 101 taught by Professor Csr during the Spring '11 term at University of Louisville.

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