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http://dx.doi.org/10.5657/kfas.2004.37.1.001

Effects of Hot Water Treatment and Dialysis on Measuring the Average Molecular Weight of Alginates  

YOU Byeong Jin (Department of Food Science, Kangnung National University)
LIM Yeong Seon (East coastral Marine Bioresources Research Center (EMBRC), Kangnung National University)
RYU Hong Soo (Faculty of Food Science and Biotechnology, Pukyong National University)
Publication Information
Korean Journal of Fisheries and Aquatic Sciences / v.37, no.1, 2004 , pp. 1-6 More about this Journal
Abstract
In preparing sodium alginates from sea tangle (Laminaria japonica) powder using the Mexican process, alkaline extraction, conversion to alginic acid and reversion to sodium alginates were used to increase purity. The effect of hot water treatment and dialysis on measuring the average molecular weight of sodium alginates were investigated. Intrinsic viscosity and average molecular weight of sodium alginates after dialysis were higher than those before dialysis. Average molecular weight of sodium alginates treated with hot water was higher than that without. Hot treatment has little effect on the ash content of sodium alginates. Ash content of sodium alginates before dialysis were $27-30\%$ those after dialysis were $10\%.$ After dialysis, Na content was highest $(89-91\%),$ K was $11-12\%,$ Ca was $1.9\%,$ and Mg was $0.05\%.$ Ash content of alginates had little effect on average molecular weight. SAV (slope of apparent viscosity) of alginates solution after dialysis showed higher values than before. SAV of the alginates with hot water treatment were higher than without treatment.
Keywords
Alginates; Average molecular weight; Dialysis; Sea tangle; Laminaria japonica;
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