• Mycobiology
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• 제37권1호
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• pp.37-42
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• 2009

Comparative effects of oyster mushrooms on plasma and fecal lipid profiles and on liver and kidney function were evaluated in hyper and normocholesterolemic rats. Feeding of hypercholesterolemic rats a 5% powder of oyster mushrooms (Pleurotus ostreatus, P. sajor-caju and P. florida) reduced the plasma total cholesterol level by 37%, 21% and 16%, respectively and reduced the triglyceride level by 45%, 24% and 14%, respectively. LDL/HDL ratio decreased by 64%, 45% and 41% for P. sajor-caju, P. ostreatus and P. florida fed rats, respectively. Mushroom feeding also reduced body weight in hypercholesterolemic rats. However, it had no adverse effect on plasma bilirubin, creatinin and urea nitrogen level. Mushroom feeding also increased the total lipid and cholesterol excretion in the feces. The present study reveals that feeding of 5% oyster mushroom powder does not have detrimental effects on the liver and kidneys rather may provide health benefits for the cardiovascular-related complication by decreasing the atherogenic lipid profiles.

• Environmental Sciences Bulletin of The Korean Environmental Sciences Society
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• 제4권3호
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• pp.185-193
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• 2000

A water treatment agent with antimicrobial activity(Ag-Os) was created by exchanging silver ion($Ag^{+}$) on calcined oyster shell powder. The desorption of the exchanged silver ion was negligible, thereby indicating a stable antimicrobial water treatment agent. The sterilization effect of Ag-Os on underwater microorganisms was then investigated. An MIC (Minimum Inhibitory Concentration) test result indicated that Ag-Os had an excellent sterilization effect on G-germs, such as Escherichia coli and Pseudomonas aeruginosa. Most germs were annihilated with an Ag-Os concentration of 200 ppm and contact time of 60 minutes. The sterilization effect was mainly dependent on the contact time. The zeta potential of the Ag-Os powder adsorbed on sand was measured relative to the concentration of exchanged silver ion. As the concentration of the exchanged silver ion increased, the surface charge density of the anions on the surface of the Ag-Os powder adsorbed on sand also increased. Accordingly, this result indicated that a higher silver ion than ion exchange capacity was present on the particle surface due to adsorption. Consequently, this increased concentration of exchanged silver ion would appear to significantly enhance the sterilization power.

• 청정기술
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• 제21권4호
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• pp.241-247
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• 2015

굴 패각은 한국 남쪽의 해안의 바다 양식 폐기물로써 처리문제로 대두되고 있다. 폐기물인 굴 패각을 실용화하기 위해서, 현지 회사에서 구입한 소성된 굴 패각(COS)에 AITC (allyl isothiocyanate)를 흡착시킨 후 식품 감염 질병을 일으키는 박테리아에 대해 성장억제능력을 시험하였다. COS 분말은 Escherichia coli, Staphylococcus aureus, Salmonella thyphimurium 균에 대해 1% 정도의 농도에서 세균 발육 억제 효과를 3에서 5 log 10 CFU/mL로 나타냄으로써 세균 발육 억제 효과를 보였으며, 순수 AITC의 MIC 결과는 Escherichia coli, Staphylococcus aureus, Salmonella thyphimurium에 대해 각각 1 mg/mL, 0.8 mg/mL 0.7 mg/mL을 나타내었다. 소성된 굴 패각은 소성과정에서 기공이 생성되어 225 mg/g의 AITC를 흡착하였고, FTIR 결과로 COS에 AITC가 흡착이 되었음을 확인하였다. 입자의 특성은 매우 미세한 입자 크기 및 높은 선상 표면을 나타내었다. AITC가 흡착된 소성된 굴 패각(ACOS)은 1% 농도에서 완전히 세균 세포를 억제함에 따라, ACOS는 COS보다 더 나은 항균활성을 나타냄을 확인하였으며, 이는 박테리아에 대해 AITC와 소성된 굴 패각의 상승효과가 있음을 나타내었다.

• Environmental Sciences Bulletin of The Korean Environmental Sciences Society
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• 제10권S_2호
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• pp.79-88
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• 2001

Humic acids react with chlorine to produce Trihalomethanes(THMs), known as carcinogens, during disinfection, the last stage in water purification. Currently, the removal of organic humic acids is considered the best approach to solve the problem of THM formation. Accordingly, the current study examined the adsorption of organic compounds of humic acids onto an inorganic carrier prepared from oyster shell waste. The adsorbent used was activated oyster shell powder(HAP) and silver ion-exchanged oyster shell powder(HAP-Ag), with CaCO$_3$ as the control. The adsorbates were phthalic acid, chelidamic acid, catechol, dodecylpyridinium chloride(DP), and 2-ethyl phenol(2-EP). The adsorption experiments were carried out in a batch shaker at $25^{\circ}C$ for 15 hours. The equilibrium concentration of the adsorbate solution was analyzed using a UV spectrophotometer and the data fitted to the Langmuir isotherm model. Since the solution pH values were found to be greater than the pKa values of the organic compounds used as adsorbates, the compounds apparently existed in ionic form. The adsorptive affinities of the organic acid and phenolic compounds varied depending on the interaction of electrostatic forces, ion exchange, and chelation. More carboxylic acids and catechol, rather than DP and 2-EP, were adsorbed onto HAP and HAP-Ag. HAP and HAP-Ag exhibited a greater adsorptive affinity for the organic compounds than CaCO$_3$, used as the control.

• Applied Biological Chemistry
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• 제44권4호
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• pp.224-229
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• 2001

굴통조림 가공부산물(세척액) 유래 분말수프의 효율적으로 이용을 위해 이의 품질안정성에 대하여 검토하였다. 굴 세척액 유래 분말수프와의 품질특성을 비교하기 위한 굴 열수추출물 유래 분말수프는 열수 추출물 분말 15 g,식염 5 g, 크림분말 19 g, 유장 분말 12 g, 밀가루 20 g, 옥수수 분말 15 g, 전분 5 g, 포도당 7.5 g, 양파가루 1.5 g을 각각 혼합하여 제조하였다. 그리고, 굴 세척액 유래 분말수프는 첨가물을 굴 열수추출물 분말수프와 같은 비율로 첨가하되, 열수 추출물 분말 15g 대신에 세척액 유래 분말 15 g을 첨가하여 제조하였다. 이와같이 제조한 굴 유래 분말수프는 알루미늄 적층필름(OPP, $20{\mu}m$; PE, $20{\mu}m$; paper, $45\;g/m^3$; PE, $20{\mu}m$; Al, $7{\mu}m$; PE, $20{\mu}m$)에 포장하여 실온에 저장하여 두고 실험하였다. 굴 세척액 유래 분말수프의 경우 저장 중 수분함량, 수분활성, 과산화물값 및 지방산 조성은 거의 변화없었고, pH, 휘발성 염기질소, 갈변도는 약간 증가하는 경향을, 백색도는 약간 감소하는 경향을 나타내었다. 이와 같은 저장 중 성분 변화 경향은 굴 세척액 유래 분말수프와 굴 열수추출물 유래 분말수프 간에 차이가 거의 없었다. 이들 굴 유래 분말수프를 식용할 수 있게 조리하여 관능검사한 결과 저장 12개월 동안 품질에 큰 변화가 인정되지 않았다. 이상의 이화학적 및 관능적 검사 결과로 미루어 볼 때 굴 세척액 유래 분말수프는 알루미늄 적층 필름(OPP, $20{\mu}m$; PE, $20{\mu}m$; Paper, $45\;g/m^3$; PE, $20{\mu}m$; Al, $7{\mu}m$; PE, $20{\mu}m$)에 포장하는 경우 상온에서 12개월 동안 품질변화가 크게 인지되지 않아 안전하게 유통 가능하다고 판단되었다.

• Environmental Engineering Research
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• 제25권2호
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• pp.230-237
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• 2020

Nitrogen flux release from organically enriched sediments into overlying water, which may have significantly influence on water quality and increasing continuous eutrophication. The purpose of this study is to evaluate the remediation efficiency of oyster shell powder and its treated product into organically enriched sediment in terms of nitrogen flux, organic matter, chlorophyll-a, pH and dissolved oxygen (DO). The TOSP was mainly composed of CaO2. The application of TOSP into the sediment has increased the pH, DO and significantly decreased the concentrations of NH₄⁺-N and T-N compared to other basins. On the other hand, nitrate was enriched with the addition of treated oyster powder, an oxygen releasing compound on both phases. Furthermore, chlorophyll-a was found to be increasing with time in the control basin meanwhile it dropped drastically with the addition of TOSP, which implied on the repression of algal growth owing to blockage of nitrogen source migrating from the sediment. This study has shown that the TOSP was effective to improve sediment-water quality, diminish eutrophication and control harmful algae blooms in a marine environment. Therefore, it is a good reference as an effective environmental remediation agent.

• 자원리싸이클링
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• 제11권2호
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• pp.45-51
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• 2002

본 연구는 수산폐기물인 폐굴껍질과 우리나라에 넓게 분포되어 있는 황토를 이용하여 응집제를 제조하기 위한 것으로서 응집제원료의 성분조사 결과, 폐굴껍질은 CaO성분이 55.43(wt%)로 가장 많이 함유되어 있었고, 황토는$ SiO_2$가 45.30(wt%)로 주성분임을 알 수 있었다. 폐굴껍질 내의 CaO순도를 높이기 위해 $900^{\circ}C$에서 2시간동안 소성 하였으며. ball mill을 사용하여 0.074 mm(200mesh)로 분쇄 하였다. 소성된 폐굴껍질 분말과 황토 분말을 각각 6:4, 7:3, 8:2, 9: 1의 비율로 혼합하여 응집제를 제조하였다 또한 제조된 응집제와 화학 소석회와의 비교실험을 통해 화학 소석회의 대체 가능성을 확인하였다.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2020년도 가을 학술논문 발표대회
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• pp.46-47
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• 2020

Oyster shells and egg shells consist of CaCO3, which is known to have excellent fire performance as the main component, and research is currently being conducted as a fireproof board material. Therefore, in this study, the physical and chemical properties of oyster shell powder and egg shell powder are studied to find out the applicability of fireproof board

• 한국축산식품학회지
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• 제38권6호
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• pp.1179-1188
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• 2018

This study aimed to investigate the combined effect of using natural calcium mixtures and various binding ingredients as replacers for synthetic phosphate in ground pork products. We performed seven treatments: control (0.3% phosphate blend), treatment 1 (0.5% natural calcium mixtures [NCM, which comprised 0.2% oyster shell calcium and 0.3% egg shell calcium powder] and 0.25% egg white powder), treatment 2 (0.5% NCM and 0.25% whey protein concentrate), treatment 3 (0.5% NCM and 0.25% concentrated soybean protein), treatment 4 (0.5% NCM and 0.25% isolated soybean protein), treatment 5 (0.5% NCM and 0.25% carrageenan), and treatment 6 (0.5% NCM and 0.25% collagen powder). All the treatment mixtures had higher pH and lower cooking loss than the control, which was treated with phosphate. We found that NCM and binding ingredients had no negative effects on the moisture content, lightness, and yellowness of the cooked ground pork products. Treatments 3 and 4 showed significantly lower CIE $a^*$ values than the control. Treatments 2 and 6 improved the textural properties of the products. In conclusion, the combination of NCM with whey protein concentrate or collagen powder could be suitable for producing phosphate-free meat products.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2016년도 추계 학술논문 발표대회
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• pp.154-155
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• 2016

Oyster shell is light weighted and its strength characteristic is similar to sand. So we produced mortar test piece using grounded oyster shell powder under 0.5mm, which is a standard of fine aggregate, and reviewed strength properties according to water cement ratio. In our test, we used two kinds of oyster shell particles: below 0.6mm and 1.2~2.5mm. Water cement ratio is varied 40% to 100% and we found that flexural strength and compressive strength are decreased in higher water cement ratio.