title: Vitamin C concentration in gastric juice before and after anti-Helicobacter pylori treatment.
abstract: OBJECTIVE
  To investigate the change of vitamin C concentration (ascorbic and dehydroascorbic acid) in gastric juice after anti-Helicobacter pylori treatment, and to relate any observed change to gastric pH, inflammatory compromise of the gastric mucosa, plasma vitamin C concentration, and smoking habits.
  
  
  METHODS
  Plasma and gastric juice vitamin C, fasting gastric juice pH, gastric histology, and smoking status were studied in 70 patients with H. pylori-associated gastritis before and after therapy.
  
  
  RESULTS
  Gastric juice ascorbic acid increased significantly after H. pylori clearance. For the most part, this change was confined to patients who experienced reduction of gastric pH. It was also related to improvement of the compromise of the gastric epithelium, reduction of the proportion of vitamin C composed by dehydroascorbic acid, and increase of the gastric juice/plasma vitamin C concentration gradient. Smokers had lower vitamin C concentrations in plasma and gastric juice before and after H. pylori clearance than nonsmokers.
  
  
  CONCLUSIONS
  The findings are consistent with a causal association between H. pylori infection and low ascorbic acid levels in gastric juice, and support two mechanisms for this association: increased oxidation and a decreased secretion of ascorbic acid.
authors.affiliation: Department of Pathology, Louisiana State University Medical Center, New Orleans.
authors.forename: B
authors.initials: B
authors.lastname: Ruiz
authors.forename: J C
authors.initials: JC
authors.lastname: Rood
authors.forename: E T
authors.initials: ET
authors.lastname: Fontham
authors.forename: G T
authors.initials: GT
authors.lastname: Malcom
authors.forename: F M
authors.initials: FM
authors.lastname: Hunter
authors.forename: M
authors.initials: M
authors.lastname: Sobhan
authors.forename: W D
authors.initials: WD
authors.lastname: Johnson
authors.forename: P
authors.initials: P
authors.lastname: Correa
mesh_terms: D000658:Amoxicillin / Q000627:therapeutic use; D001205:Ascorbic Acid / Q000032:analysis*; D001729:Bismuth / Q000627:therapeutic use; D005260:Female; D005750:Gastric Juice / Q000737:chemistry*; D005756:Gastritis / Q000188:drug therapy / Q000378:metabolism / Q000382:microbiology*; D016481:Helicobacter Infections / Q000188:drug therapy / Q000453:epidemiology / Q000378:metabolism*; D016480:Helicobacter pylori / Q000302:isolation & purification*; D006801:Humans; D008297:Male; D008795:Metronidazole / Q000627:therapeutic use; D008875:Middle Aged; D009582:Nitrofurantoin / Q000627:therapeutic use; D009942:Organometallic Compounds / Q000627:therapeutic use; D012459:Salicylates / Q000627:therapeutic use; D012907:Smoking / Q000453:epidemiology
chemical_list: D009942:Organometallic Compounds; D012459:Salicylates; D008795:Metronidazole; C015715:bismuth subsalicylate; D000658:Amoxicillin; D009582:Nitrofurantoin; D001205:Ascorbic Acid; D001729:Bismuth