• Polymer(Korea)
• /
• v.27 no.6
• /
• pp.583-588
• /
• 2003

Sulfated chitosan and sulfated sodium alginate were synthesized by sulfating reaction of low molecular chitosan and low molecular sodium alginate with SO$_3$-pyridine complex. When the weight ratio of SO$_3$-pyridine complex to polysaccharide was 1:5, the degrees of sulfation were the highest at 2.75 and 2.53 respectively. The anticoagulation effect was the highest when the molecular weight was 8.0${\times}$10$^3$ Da, and the anticoagulation activity was the highest at 91% of that of heparin when sulfated chitosan and sulfated sodium alginate were mixed at a weight ratio of 1:1. The anticoagulation activity was highest at 84% of that of heparin in the active plastin trombo test (aPTT) when sulfated chitosan and sulfated sodium alginate were mixed at a weight ratio of 1:1.

• Korean Journal of Food Science and Technology
• /
• v.14 no.4
• /
• pp.336-341
• /
• 1982

The histochemical examination of Undaria pinnatifida Laver were conducted with light microscope and electron microscope. The results obtained were as follow: 1. Undaria pinnatifida frond were composed with epidermis, cortex and medulla. But the cutting section of Undaria pinnatifida Laver showed that only the epidermal cell were bound to each other. The cortex and medulla of the frond were destroyed during U.P. Laver process. 2. To identification of bind material of U.P. Laver, which were treated with sodium carbonate solution for extraction of alginic acid and reacted with Periodic Acid Schiff(PAS) reagent. And the PAS reaction result was negative by light microscope observation. On this result, we found out that the alginic acid has the binder role of U.P. Laver. 3. Also, the bind structure of U.P. Laver were observed by electron microscope and could well find out the epidermal cell wall and bind position of alginic acid, which were could not observed by light microscope.

• Korean Journal of Food Science and Technology
• /
• v.9 no.3
• /
• pp.194-198
• /
• 1977

A seaweed Ecklonia cava from Jeju island was irradiated with $0.1{\sim}6\;Mrad$ of gamma-rays and the yield and viscosity characteristics of alginates from it were examined. Irradiation below 1 Mrad dose brought about a 70% increase in the yield while higher doses caused slight decreases. Viscosity behavior of alginates below 0.5 Mrad dose was not altered while the viscosity decreased markedly above 1 Mrad dose, likely due to the depolymerization.

• Korean Journal of Food Science and Technology
• /
• v.6 no.1
• /
• pp.36-41
• /
• 1974

Gracilaria verrucosa and Gelidium amansii collected from Wando, Yeosoo and Namhae districts Gracilaria sp. imported from Manila, and Ecklonia cava from Cheju island were investigated to raise the extraction yield of agar or alginic acid. The results are summarized as follows. In agar extraction from domestic seaweeds, Gelidium sp. showed 8-10% yield increase by gamma-irradiation whereas Gracilaria sp. exhibited no effect. In Manila seaweed, gamma-irradiation (1.5 Mrad) caused 25-30% increase in agar extraction and the properties of agar sample by these methods were acceptable. In alginic acid extraction from Ecklonia sp., gamma-irradiation (0.3 Mrad) showed 6% yield increase.

• Proceedings of the Membrane Society of Korea Conference
• /
• 1999.04a
• /
• pp.69-72
• /
• 1999

• Korean Journal of Food Science and Technology
• /
• v.16 no.3
• /
• pp.336-340
• /
• 1984

The optimum conditions for extracting alginic acid from the powdered Undaria pinnatifida and amino acid composition of its extraction residue were investigated. Extraction with 60 volumes of 1.0% sodium carbonate solution to the sample at $80^{\circ}C$ gave a maximum yield of alginic acid and the optimum extraction time was 3 hours when all the other extraction conditions had teen satisfied. In the process of precipitating alginic acid gel from algin solution, the highest yield was obtained at pH 2.0 and 1.0% $H_{2}SO_{4}$ was more suitable than 10% HC1 as a precipitating agent. Extraction residue remained by separating algin solution contained 51.5% (on the dry baiss) of crude protein, and its limiting amino acid and protein score were lysine and 41.5, respectively.

• Korean Journal of Plant Tissue Culture
• /
• v.21 no.3
• /
• pp.183-186
• /
• 1994

Somatic embryos derived from cell suspension cultures of rice were singly alginate-encapsulated to be used as artificial seeds. When placed on half strength MS solid medium,73% of the encapsulated somatic embryos were capable of germination Encapsulation per se did not affect the germination frequency of embryos. When incubated by wrapping with moistured non-sterile filter paper, 60% of the encapsulated somatic embryos germinated. However encapsulated zygotic embryos without endosperm showed a high germination frequency regardless of the sterility of the incubation conditions. The results suggest that a greater susceptibility of somatic embryos to contaminants is attributed to lower germination frequency of encapsulated somatic embryos in non-sterile conditions.

• Polymer(Korea)
• /
• v.28 no.4
• /
• pp.352-359
• /
• 2004

Membrane technology was used for the optical resolution of the various racemic compounds such as tryptophan, tyrosine and phenylalanine, using enantioselective membranes prepared from sodium alginate (SA) and glutaraldehyde as a membrane material and crosslinking agent, respectively, The chemical structure of the membranes was characterized with FT-IR spectrophotometry and 3D molecular structure modeling study was done to figure out the optical resolution mechanism through the membrane. Effects of degree of crosslinking, feed concentration, operating pressure and different kinds of feed solution on the membrane performances were studied. As results, it was found that with increasing degree of crosslinking and membrane thickness, and decrease in the concentration of the feed solution and smaller size of solutes, the enantinselectivity of the membrane was improved. When the sodium alginate membranes with 80% of swelling index and 79${\mu}{\textrm}{m}$ of thickness were used, 77% of enantiomeric excess was obtained.

• Journal of Plant Biotechnology
• /
• v.34 no.3
• /
• pp.229-235
• /
• 2007

Artificial seeds were produced by encapsulation of somatic embryos of Kalopanax septemlobus and investigated the effects of alginic acid concentration, size of somatic embryos, additives in capsules and nursery seedbeds for germination. The most suitable concentration of alginic acid was 3% for germination of encapsulated seeds. Germination was suppressed at higher concentration more than 3% alginic acid. For germination of artificial seeds, 1/2 MS medium with 0.02% activated charcoal was effective. There was no significant differences on the germination among the different size of somatic embryos. Additives in hydrated capsule was very important for germination and post-germinative growth of artificial seeds. Germination was severly inhibited in hydrated capsule containing only distilled water. Both sucrose and MS medium addition in hydrate capsule was effective for germination of artificial seeds. When artificial seeds were transferred to soilbed, germination rate was high in perlite containing 3% sucrose but very low in perlite with only water. These results indicate that nursery additives in both hydrate capsules and soilbeds was important for germination of artificial seeds in Kalopanax septemlobus.

• Journal of Nutrition and Health
• /
• v.11 no.3
• /
• pp.9-12
• /
• 1978

An effect of alginate and seaweeds on the intestinal absorption of cadmium was tested in vitro. The absorption of cadmium was remarkably suppressed by alginate though the effect was not selective toward cadmium or calcium. The suppressive effect was also observed with tangle and laver, differing in some aspects from alginate only.