Acid tolerance and fecal recovery following oral administration of Saccharomyces cerevisiae

Daniele Scevola, L. Perversi, C. Cavanna, C. Candiani, F. Uberti, B. Castiglioni, P. Marone

Research output: Contribution to journalArticlepeer-review


Probiotic microorganisms to be used as biotherapeutic agents have to resist the rigors of the upper human gastrointestinal tract. In this study we evaluated the acid tolerance in vitro and the fecal recovery in vivo after oral administration of a Saccharomyces cerevisiae strain to healthy volunteers. At the lowest pH value (pH 1.0) the yeast load in tablets decreased slightly. From pH 1.0 to pH 7.0 the release of S. cerevisiae in buffer solutions increased. The selected yeast strain showed good tolerance to low pH which mimic the gastric environment. After one month of treatment at a dose of 100 million cells per day, S. cerevisiae grew from the feces of 6 (37.5%) of the 16 healthy, treated volunteers. Based on the results of the present experiments the yeast studied can be considered a strain that tolerates adverse conditions comparable to those of the human gastrointestinal tract, and when administered orally may colonize the bowel of healthy volunteers and even replace resident Candida species.

Original languageEnglish
Pages (from-to)143-147
Number of pages5
JournalJournal of Chemotherapy
Issue number2
Publication statusPublished - Apr 2003


  • Acid tolerance
  • Fecal recovery
  • Probiotics
  • Saccharomyces cerevisiae

ASJC Scopus subject areas

  • Pharmacology (medical)
  • Microbiology (medical)


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