title: [Microplate for high throughput screening of 6-hydroxynicotinic acid transforming strains].
abstract: Recently, new insecticides containing 3-chloropyridylmethyl group as a versatile building block have been developed, among which imidachloprid is a promising one. The synthesis of imidachloprid can use 6-Hydroxynicotinic acid, the first intermediate of the bacterial degradation of nicotinic acid, as a starting material. It is difficult to hydroxylate nicotinic acid at C6 position in a chemical synthesis. However, biotransformation can produce 6-hydroxynicotinic acid with industrial application possibility. Therefore, methods for large scale screening of 6-hydroxynicotinic acid-producing microorganisms are urgent. A high through-put screening method for 6-hydroxynicotinic acid transforming strains was established by determining 6-hydroxynicotinic acid based on 96-well Microplate-Multiskan Spectrum. The determination wavelength and the reference wavelength of 6-hydroxynicotinic acid were 251nm and 231nm respectively. Beer's law is obeyed in the range of 0.5-11 microg/mL (R2 = 0.9999) for measuring 6-hydroxynicotinic acid. The average recovery rate was 99.11%-100.81%. The results showed that there was no apparent difference between our microplate method and previous HPLC method in the detecting 6-hydroxynicotinic acid formation. The microplate method is simple, convenient and accurate. It has the potential for large scale (about 2000 - 5000 reactions/d) screening of 6-hydroxynicotinic acid-producing microorganisms.
authors.affiliation: Jiangsu Key Laboratory for Bioresource Technology, Nanjing Microbial Technology Research Center, College of Life Science, Nanjing Normal University, Nanjing 210046, China. cranny_yang@hotmail.com
authors.forename: Yao
authors.initials: Y
authors.lastname: Yang
authors.forename: Sheng
authors.initials: S
authors.lastname: Yuan
authors.forename: Yijun
authors.initials: Y
authors.lastname: Dai
authors.forename: Guangdong
authors.initials: G
authors.lastname: Shang
mesh_terms: D001419:Bacteria / Q000378:metabolism*; D001711:Biotransformation; D007306:Insecticides / Q000378:metabolism*; D009539:Nicotinic Acids / Q000378:metabolism*; D013056:Spectrophotometry, Ultraviolet / Q000379:methods*
chemical_list: D007306:Insecticides; D009539:Nicotinic Acids; C046300:6-hydroxynicotinic acid