Surface Tension Study of Natural Hydrotropes and Surfactants from Wintergreen Oil (WGO) and Virgin Coconut Oil (VCO)
Tri P. Mena

Brawijaya University

Abstract

Hydrotropes are small amphiphilic compounds consisting of ionic or non-ionic polar heads and short aromatic or alkyl hydrophobic tails (&#8804- C6) which distinguish them from surfactants which have longer tails (&#8805- C8). One of the hydrotropes, sodium salicylate, has been used in the development of secondary metabolite extraction. In addition to hydrotropes, surfactants have been widely used in products under various conditions. The purpose of this research was to study the effect of surface tension between hydrotropes and surfactants synthesized from natural resources. The results of the study are as follows: (1) GC-MS analysis of oil (WGO: methyl salicylate 75.58% and diethyl phthalate 24.42%- and VCO: methyl caprylate 7.39%, methyl laurate 59.7% and methyl myristate 16.14%). (2) % yield of synthesis (Na-WGO: 82.4%- Na-VCO: 77.74%). (3) Characteristics of the synthesis results (Na-WGO: gray color, solid form, soluble in water- Na-VCO: white color, solid form, soluble in water). (4) FT-IR analysis (Na-WGO: CO2 carboxylate, C-O alcohol, C-O-H carboxylate- VCO: O-Na, Carboxylate anion, C-H alkane). The sodium salt of wintergree oil has a CMC of 1.4 M and the sodium salt of VCO has a CMC of 0.28 M.

Keywords: Natural Hydrotrope, Natural surfactant, Surface tension, CMC, WGO, VCO

Topic: Organics Chemistry