EKSTRAKSI KARAGINAN DARI RUMPUT LAUT EUCHEUMA COTTONII

Abstract

Conventional extraction is no longer effectively being applied since it uses a large volume of solvent, required
longer time of extraction and less yield produced. So that alternative extractions, such as extraction using ultrasonic and
micro waves, is developed. The aims of this research are: 1. To study the influences of power applied, ratio seaweed and
times to produce yield of extraction with micro vave, 2. To study the influence of times of extraction to quality of
extraction with ultrasonic wave, 3. To compare karagenan yield using micro and ultrasonic waves, 4. To compare
karagenan’s quality extracted by micro and ultrasonic waves. Ultrasonic wave extraction conducted at 50 oC, 40 kHz
frequency, with medium power, ratio seaweed and solvent 1/30, pH 8,5-9, and extraction time of 40 minutes. Whereas
micro wave extraction conducted with variation of power applied, ratio seaweed and solvent, and extraction times to the
yield of karagenan. Quality tested parameters include water content, ash content, viscosity, and gel strength. By micro
wave extraction found that power, ratio seaweed and solvent, and extraction times increase, the yield increases.
Addtionally as time extraction increases, its water content and gel strength also increase with ash content remain constant
while its viscosity decreases. Karagenan yield extracted with ultrasonic waves is found greater compared to micro wave
at the same temperature and times of extraction. Both ultrasonic and micro waves extractions show their gel strength and
water content fulfilled commercial karagenan standard, their viscosities and ash content also fulfilled to FCC standard
and their viscosity and water content also fulfilled to FAO standard.