Micellar-enhanced ultra filtration of coconut water using an Anionic surfactant

Date

8-1995

Degree

Bachelor of Science in Chemistry

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Ernesto J Del Rosario

Abstract

SENSANO, JANE GANAYO. College of Arts and Sciences, University of the Philippines at Los Banos, August 1995. Micellar-enhanced Ultrafiltration of Coconut Water Using an Anionic Surfactant.

Adviser: Ernesto J. del Rosario, Ph.D.

Ultrafiltration (UF) membranes containing the mass ratio 18:82 of polysulfone (PS) resin to N,N-dimethyl acetamide (DMAc) were prepared. Polyvinyl pyrrolidone (PVP) was added to constitute 10% of PS. The pinhole-free membranes were characterized in terms of uniformity of thickness, water flux, molecular weight cut-off, fouling, pore size, and pore density.

Two membranes (hereon designated as Membrane I and Membrane II) were selected on the basis of their similarity in characteristics. The characteristics of Membranes I and II, respectively, were as follows: mean thickness, 0.105 ± 0.011 mm pnd 0.115 ± 0.012 mm; water flux, 176.0 L/m2 -hr and 153.4 L/m -hr; rejection coefficient (or) for bovine serum albumin (66 kD), 78.7 t 1.2% and 77.3 ± 0.6%; and or for a-chymotrypsinogen-A (25 kD), 46.0 ± 0.6% and 47.6 ± 1.6%. Excessive membrane fouling was observed as manifested by the rapid decrease in water flux after OF of the standard proteins.

Scanning electron microscopy (SEM) showed that the average pore diameter at the bottom surface of Membrane I was 0.88 ± 0.34 pm and 0.50 ± 0.18 pm for Membrane II. The pore densities were determined to be 0.073 ± 0.014 and 0.088 ± 0.015 for Membranes I and II, respectively.

The membranes were used to concentrate the sugars in coconut water through micellar-enhanced ultrafiltration (MEUF) after adding sodium dodecylsulfate (SDS), an anionic surfactant, to coconut water at desired concentrations. Using Membrane I, the or for total sugars increased from 22.9% below 0.004 M SDS to 32.3% above this concentration; for Membrane II, ar values increased from 25.6% below 0.006 M SDS to 65.9% above this concentration. The increase in a, may be explained by the formation of micelles above the critical micelle concentration (cmc) which trapped the sugars and kept them at the retentate. The results show the potential of MEUF in the recovery of sugars from coconut water.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Document Type

Thesis

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