title: Ruminal microbe of biohydrogenation of trans-vaccenic acid to stearic acid in vitro.
abstract: BACKGROUND
  Optimization of the unsaturated fatty acid composition of ruminant milk and meat is desirable. Alteration of the milk and fatty acid profile was previously attempted by the management of ruminal microbial biohydrogenation. The aim of this study was to identify the group of ruminal trans-vaccenic acid (trans-11 C18:1, t-VA) hydrogenating bacteria by combining enrichment studies in vitro.
  
  
  METHODS
  The enrichment culture growing on t-VA was obtained by successive transfers in medium containing t-VA. Fatty acids were detected by gas chromatograph and changes in the microbial composition during enrichment were analyzed by denaturing gradient gel electrophoresis (DGGE). Prominent DGGE bands of the enrichment cultures were identified by 16S rRNA gene sequencing.
  
  
  RESULTS
  The growth of ruminal t-VA hydrogenating bacteria was monitored through the process of culture transfer according to the accumulation of stearic acid (C18:0, SA) and ratio of the substrate (t-VA) transformed to the product (SA). A significant part of the retrieved 16S rRNA gene sequences was most similar to those of uncultured bacteria. Bacteria corresponding to predominant DGGE bands in t-VA enrichment cultures clustered with t-VA biohydrogenated bacteria within Group B.
  
  
  CONCLUSIONS
  This study provides more insight into the pathway of biohydrogenation. It also may be important to control the production of t-VA, which has metabolic and physiological benefits, through management of ruminal biohydrogenation bacterium.
authors.affiliation: State Key Laboratory of Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, 00193, PR China.
authors.forename: Dan
authors.initials: D
authors.lastname: Li
authors.forename: Jia Qi
authors.initials: JQ
authors.lastname: Wang
authors.forename: Deng Pan
authors.initials: DP
authors.lastname: Bu
mesh_terms: D000818:Animals; D001419:Bacteria / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D001711:Biotransformation; D002849:Chromatography, Gas; D003470:Culture Media; D058645:Denaturing Gradient Gel Electrophoresis; D006865:Hydrogenation; D059013:Microbial Consortia / Q000235:genetics*; D009829:Oleic Acids / Q000378:metabolism*; D010802:Phylogeny; D012336:RNA, Ribosomal, 16S / Q000235:genetics*; D012418:Ruminants / Q000382:microbiology; D013229:Stearic Acids / Q000378:metabolism*; D013279:Stomach, Ruminant / Q000382:microbiology
chemical_list: D003470:Culture Media; D009829:Oleic Acids; D012336:RNA, Ribosomal, 16S; D013229:Stearic Acids; C031183:stearic acid; C050413:11-octadecenoic acid