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- Jo, Ji Song, et al.
(författare)
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Anti-wrinkle activity of beta-carotene extracted & purified from recombinant Escherichia coli
- 2008
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Ingår i: KSBB Journal. - 1225-7117 .- 2288-8268. ; 23:6, s. 513-518
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Tidskriftsartikel (refereegranskat)abstract
- This paper described the extraction/purification of β-carotene from recombinant E.coli and evaluation of anti-wrinkle activity of purified β-carotene. No significant differences in extraction yields were observed when hexane or isobutyl acetate was used. However, extraction from wet-cell cake resulted in 2-fold higher amount of β-carotene than that from dry cells. Disruption of 5 g-wet cells by ultrasonic homogenizer, acetone dehydration, extraction with isobutyl acetate resulted in 36 mg of β-carotene corresponding to 61.2% of recovery. The formation and separation of ββ-carotene crystal improved the purity. 633 mg of β-carotene crystal with 93% purity was obtained from 223 g/L of wet-cell cake harvested from 2.5-L fed-batch culture broth. The cultures of normal human primary fibroblast were performed to investigate the effect of β-carotene on cytotoxicity as MTT assay and anti-wrinkle activity as collagen synthesis assays. 1.7μM of β-carotene was found to be optimal concentration at which 1.4-fold higher amount of collagen was synthesized than that in absence of β-carotene. This indicates that highly purified β-carotene can be obtained from recombinant E.coli by applying simple method with less toxic solvent and can be used in functional cosmetics as anti-wrinkle agent.
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- Kim, Chang Joon, et al.
(författare)
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발리올아민의 UV 분석방법 (A method for analysis by UV detector of valiolamine)
- 2011
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Patent (populärvet., debatt m.m.)abstract
- A UV analysis method of valiolamine is provided to maximize detection sensitivity of valiolamine by making valiolamine to phenylisocyanate, and to enable accurate and quick HPLC analysis. CONSTITUTION: A UV analysis method of valiolamine comprises the steps of: deriving valiolamine in a microbial culture medium with a chromophore reagent to increase the detection sensitivity; and analyzing the valiolamine with increased detection sensitivity with a high performance liquid chromatography(HPLC)/UV detector. The microbial culture medium uses at least one of (i) glucose 50 g/L, soybean flour 36 g/L, peptone 5 g/L, CaCO3 4 g/L; (ii) glucose 20 g/L, corn starch 40 g/L, corn steep liquor 20 g/L, corn gluten meal 40 g/L, NH4Cl 5 g/L, NaCl 15 g/L, CaCO3 15 g/L; or (iii) glucose 10 g/L, soluble starch 50 g/L, peptone 15 g/L, corn gluten powder 30 g/L, NaCl 5 g/L, CaCO3 10 g/L. COPYRIGHT KIPO 2010
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