• 생명과학회지
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• 제17권1호
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• pp.132-136
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• 2007

E. coli에서 Pseudoalteromonas elyakovii 유래의 alginate lyase유전자(aly)를 발현시킬 때, 대부분의 단백질이 불용성 내포체 형태로 발현됨을 확인하였다. Alginate lyase를 가용성 활성형으로 생산하기 위해 aly와 DnaK/DnaJ/GrpE 또는 aly와 GroEL/ES을 공발현하는 형질전환체를 얻었다. 공발현 결과, 단백질의 올바른 접힘을 도와주는 DnaK/DnaJ/GrpE chaperone이 가용성 및 활성형의 alginate lyase 생산에 매우 효과적임을 알 수 있었다. DnaK/DnaJ/GrpE chaperone의 발현에 유도제인 L-arabinose 최적 농도는 0.05 mg/ml이었으며, 이러한 공발현에 의해 약 34%의 alginate lyase가 가용성 분획에서 생산되었다. 또한 10%의 cetylpyridinium chloride를 첨가함으로써, 공발현 콜로니 주위에 투명환이 형성됨을 확인할 수 있었고, 이는 활성형 alginate lyase 효소에 의해 alginate가 분해되었음을 시사하였다.

• Food Science and Biotechnology
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• 제17권5호
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• pp.1003-1009
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• 2008

This study was performed to determine the effects of $\gamma$-irradiation on the antiallergic activity of alginate. An alginate aqueous solution was $\gamma$-irradiated at 3, 5, 7, 10, 20, and 100 kGy. First, the molecular weight (Mw) of alginate rapidly decreased as the $\gamma$-irradiation dose increased up to 20 kGy. Then, the antiallergic activity of the $\gamma$-irradiated alginate was measured. Interlukin (IL)-4 cytokine and IgE level were significantly decreased in the $\gamma$-irradiated alginate groups as compared to the control group in vitro. The mice intraperitoneally administered with the $\gamma$-irradiated alginate exhibited lower ovalbumin-specific IgE and IgG1 level in serum than the control mice. Furthermore, the $\gamma$-irradiated alginate suppressed total and ovalbumin-specific IgE secretions in the splenocytes. Increased IL-2 level was observed in the culture supernatants of the splenocytes that were obtained from the mice administerd with the $\gamma$-irradiated alginate, while IL-4 level decreased. The present study indicates that $\gamma$-irradiated alginate can suppress allergy in a mouse allergy model.

• Environmental Engineering Research
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• 제17권3호
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• pp.133-138
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• 2012

Polyvinyl alcohol/alginate hydrogel beads containing Mg-Al layered double hydroxide (LDH-PVA/alginate beads) were synthesized for phosphate removal. Results showed that blending PVA with the LDH-alginate beads significantly improved their stability in a phosphate solution. The kinetic reaction in LDH-PVA/alginate beads reached equilibrium at 12 hr-post reaction with 99.2% removal. The amount of phosphate removed at equilibrium ($q_e$) was determined to be 0.389 mgP/g. The equilibrium data were described well by the Freundlich isotherm with the distribution coefficient ($K_F$, 0.638) and the constant (n, 0.396). Phosphate removal in LDH-PVA/alginate beads was not sensitive to solution pH. Also, the removal capacity of LDH-PVA/alginate beads ($q_e$, 1.543 mgP/g) was two orders of magnitude greater than that of PVA/alginate beads ($q_e$, 0.016 mgP/g) in column experiments. This study demonstrates that LDH-PVA/alginate beads with a higher chemical stability against phosphate compared to LDH-alginate beads have the potential for phosphate removal as adsorptive media.

• 멤브레인
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• 제26권1호
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• pp.55-61
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• 2016

저압 침지식 멤브레인을 이용한 해수 담수화 전처리에 있어서 유기 파울링은 막간 압력 증가로 인한 화학 세정 횟수의 증가 및 에너지 소비 증가 등 멤브레인 운전시 문제점들을 야기한다. 조류대응 해수전처리에서 조류가 배출하는 extracellular polymeric substances의 대표물질인 sodium alginate를 이용하여 침지식 여과에서 파울링 현상을 관찰하였다. 공기 폭기가 적용되지 않은 경우 순수한 aglinate 파울링은 농도가 증가하면서 증가하였다. 그러나 공기 폭기를 적용해 준 경우 alginate 파울링 감소는 매우 효과적이었다. 공기 폭기가 없는 경우 칼슘 농도의 증가에 따라 alginate 파울링은 감소하였다. 동일 조건에서 공기 폭기 시 높은 alginate 파울링 감소효과를 나타내었으나 NaCl 농도를 증가시킨 경우 칼슘 농도의 증가에 따라 파울링 제어를 위한 공기 폭기 효과는 감소하였다. 해수와 유사한 높은 NaCl과 칼슘 농도에서 고농도 sodium alginate의 경우 공기 폭기량 증가를 통해 초기 파울링을 감소시킬 수 있었으나 시간의 경과에 따라 상대적으로 낮은 폭기량에서의 파울링 감소 효과와 큰 차이는 없었다.

• Journal of Pharmaceutical Investigation
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• 제23권1호
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• pp.19-26
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• 1993

The purpose of this paper is to explore the possible applicability of alginate beads as an oral controlled release system of polymeric drugs. Cellulase was used as a model polymeric drug. The release of cellulase from alginate beads was moderately affected by the ratio of cellulase to sodium alginate and strongly affected by $CaCl_2$ concentration. However, the release was not particularly affected by the other factors such as sodium alginate concentration and curing time. The drug was not released from alginate beads at pH 1.2, but was released continuously up to 8 hr at pH 6.8. At pH 6.8, the beads were swollen highly up to 3 hr, thereafter, were eroded into the bulk solution up to 6 hr, completely. Drug release from the beads can be caused due to diffusion and erosion of the matrix. Activity of cellulase was reduced when alginate beads containing cellulase were stored in simulated gastric juice. Further investigation would be necessary to improve the acid resistance of the beads. Since the release of cellulase as a model polymeric drug could be controlled by the regulation of the preparation conditions of alginate beads, the alginate beads may be used for a potential oral controlled release system of such polymeric drugs as polypeptide drugs.

• 생명과학회지
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• 제17권12호
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• pp.1754-1759
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• 2007

해조류에서 추출한 다양한 생리활성을 갖고 있는 alginate를 유산균 담지체로 하여 유산균을 담지한 결과, 아주 작은 구형의 유산균 미세입자를 제조할 수 있었다. 유산균 미세입자는 위에서는 전혀 분해가 일어나지 않은 상태에서 유산균을 안정하게 담지하고 있다가 대장에서 분해가 됨으로써 유산균의 활성을 나타내는 것을 알 수 있었다. 제조된 유산균 미세입자는 위에서 유산균의 사멸을 방지하므로서 효과적으로 대장까지 전달시킬 수 있을 것이다. 특히 유산균 미세입자는 유산균의 자체효과 외에 유산균을 담지하기 사용된 alginate와 코팅제로 사용된 키토산의 유용한 생리 활성을 모두 나타낼 수 있는 다기능성 유산균 미세입자로 응용이 가능할 것으로 판단된다.

• 한국수산과학회지
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• 제32권5호
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• pp.582-586
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• 1999

생분해성으로서 가식성인 alginate 필름을 가공하기 위한 기초자료로써 $3\%$ $Na_2CO_3$ 추출시간 5시간으로 추출한 alginate로 만든 alginate 필름의 수증기 투과율과 장력성에 영향을 미치는 alginate농도와 가소제의 종류별 첨가량에 관한 조건을 측정한 결과는 다음과 같다. Alginate의 농도가 증가할수록 인장강도는 증가하였으나 수증기 투과율과 신장도는 감소하였다. 반면에 가소제의 첨가량이 증가할수록 수증기 투과율과 신장도는 증가하였으나 인장강도는 감소하였다. 가소제의 종류별에 따른 수증기 투과율은 glycerol, polyethylene glycol 및 sorbitol 첨가 필름 순으로 높게 나타났으며, 인장강도는 polyethylene glycol, sorbitol, glycerol 첨가 필름 순서이었으나 신장도는 그 반대되는 결과였다. 가소제의 종류와 필름의 색은 sorbitol 첨가 필름의 색이 가장 자았고, 황색도는 glycerol 첨가 필름이 가장 높았고, 적색도는 polyethylene glycol 첨가 필름이 가장 높았다. 그리고 전체적인 색의 차이에서는 polyethylene glycol 첨가 필름이 가장 높았다.

• 한국환경보건학회지
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• 제27권1호
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• pp.83-87
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• 2001

In this study, the characteristics of lead removal by PVA and alginate bead which used widely as immobilizing agents were investigated, and the difference of removal amounts between pure PVA/alginate bead and Sargassum thunbergii immobilized bead was studied. All PVA beads, pure and S. thunbergii immobilized, reached an equilibrium state in about 1 hour, and S. thunbergii immobilized bead adsorbed more lead than pure one. But in the case of alginate beads, they needed much time, about 5 hours, to reach an equilibrium state, and adsorbed lead four times higher than PVA beads. Therefore, it was considered that alginate beads had more mass transfer resistance and function groups which adsorb lead such as hydroxyl, carboxyl and etc. than PVA bead. To examine the continuous usage of alginate beads, the process of adsorption/desorption of lead was conducted repeatedly. As the process proceeded, the amounts of lead adsorption decrease, so it was indicated that the non-desorbed lead from alginate bead at first adsorption/desorption process remained constantly.

• Journal of Microbiology and Biotechnology
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• 제9권2호
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• pp.132-139
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• 1999

A cell-entrapment technique using compressed air was applied to Bifidobacterium longum KCTC 3128 for the improvement of bifidobacteria viability. The main cell-entrapment matrix used was alginate, and viability improvement of the B. longum entrapped in alginate lattices was monitored along with the effects of other additional biopolymers. A prerequisite for acquiring consistent results was the uniformity of bead size and cell distribution which was achieved by using compressed air and mixing the cell suspension with sterilized alginate powder, respectively. The viability losses of the B. longum entrapped in alginate beads in the presence of three different substances logarithmically increased in relation to the reaction time, and proportionately decreased with an increased alginate concentration and bead diameter. The strongest improvement in B. longum viability was exhibited with a bead containing 3％ alginate and 0.15％ xanthan gum.

• Carbon letters
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• 제11권2호
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• pp.117-121
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• 2010

The composites of alginate, carbon nanotube, and iron(III) oxide were prepared for the removal of heavy metal in aqueous pollutant. Both alginate and carbon nanotube were used as an adsorbent material and iron oxide was introduced for the easy recovery after removal of heavy metal to eliminate the secondary pollution. The morphology of composites was investigated by FE-SEM showing the carbon nanotubes coated with alginate and the iron oxide dispersed in the alginate matrix. The ferromagnetic properties of composites were shown by including iron(III) oxide additive. The copper ion removal was investigated with ICP AES. The copper ion removal efficiency increased greatly over 60% by using alginate-carbon nanotube composites.