• ALGAE
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• 제19권3호
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• pp.271-276
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• 2004

One hundred and fifty four micro algal strains, newly isolated from nationwide freshwaters in Korea, were screened for their anticancer, ant diabetic, and antibiotic activities. The micro algal strains were cultured with different nutritional conditions that were divided into 4 groups as follows; a normal Allen medium, nitrogen (N)-limited medium, phosphorus (P)-limited medium, and N and P-limited medium. Algal biomass was extracted with a mixture of acetone:H₂O (1:1, v:v) and the extracts were used for the screening of bioactive materials. Anticancer, ant diabetic, and antibiotic materials were screened by the methods of vaccinia Hl-related protein tyrosine phosphates (VHR DS-PTPase) inhibition, protein tyrosine phosphates 1B (PTP1B) inhibition, and paper disk. The inhibition activity of VHR DS-PTPase was observed in 18 strains, having a maximum 79% inhibition from Anabaena affinis and the inhibition activity of PTP1B was observed in 9 strains, having a maximum 97% from Sphaerocystis schroeteri. Microcystis aeruginosa incubated in an N and P-limited medium showed antibiotic activity in 8 species out of 13 pathogenic bacteria. As a whole, it seemed that the stressed condition such as N and/or P limitation increased the production of bioactive materials in micro algae.

• 생약학회지
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• 제40권1호
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• pp.1-5
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• 2009

The antioxidant and anti-diabetes effects were evaluated by the ethanol extracts from Astragalus membranaceus root classified by years using through DPPH radical scavenging activity, hydroxyl radical (${\cdot}OH$) scavenging activity, total phenolic and flavonoid contents, reducing power activity, $\alpha$-amylase and $\alpha$-glucosidase inhibitory activities. $IC_{50}$ values for DPPH radical scavenging activity of ethanol extract from 6 years old root ($749.25{\mu}g/mL$) was higher than 1 year ($1452.67{\mu}g/mL$) and 3 years old root ($1095.61{\mu}g/mL$). 6 years old root showed better effects in ${\cdot}OH$ scavenging activity ($IC_{50}$: $10.58{\mu}g/mL$), reducing power, total phenolic contents ($26.13{\pm}0.79\;Tan\;{\mu}g/mg$, $24.03{\pm}0.74\;Cat\;{\mu}g/mg$) $\alpha$-amylase ($33.33{\pm}0.55%$) and $\alpha$-glucosidase inhibitory activity ($49.71{\pm}1.01%$). On the other hand, total flavonoid compound contents were estimated much higher in 1 year old root ($44.93{\pm}1.35\;Que\;{\mu}g/mg$, $70.32{\pm}2.03\;Rut\;{\mu}g/mg$) than others. Based on these results, It was suggested that 6 years old root of A. membranaceus has a potential candidate for functional cosmetic and medicine.