title: Stable isotope model for estimating colonic acetate production in premature infants.
abstract: In premature infants, a nutritionally significant proportion of lactose is apparently fermented in the colon to acetate. To estimate the rate of entry of acetate into the peripheral circulation, a model that takes into account extraction of gut-derived acetate by splanchnic and hepatic tissues was developed. Using a [1-13C]acetate orogastric infusion technique, six studies were carried out on five premature infants during constant orogastric feeding. Ranges in gestational age, postnatal age, and breath H2 concentration (corrected for CO2 content) were 28-32 weeks, 16-29 days, and 45-252 microL/L, respectively. The estimated rate of entry of acetic acid (mean +/- SD) was 63.7 +/- 33.8 mumol.kg-1.min-1 (range, 22.9-123.2 mumol.kg-1.min-1), which corresponded to 64.3% +/- 38.6% (24%-136%) of the potential two carbon units from dietary lactose. Thus, a substantial fraction of dietary lactose in premature infants may be converted to acetic acid; this conversion could have a significant effect on protein as well as energy requirements.
authors.affiliation: Department of Pediatrics, Ohio State University, Columbus.
authors.forename: C L
authors.initials: CL
authors.lastname: Kien
authors.forename: J
authors.initials: J
authors.lastname: Kepner
authors.forename: K
authors.initials: K
authors.lastname: Grotjohn
authors.forename: K
authors.initials: K
authors.lastname: Ault
authors.forename: R E
authors.initials: RE
authors.lastname: McClead
mesh_terms: D000085:Acetates / Q000378:metabolism*; D019342:Acetic Acid; D000818:Animals; D002162:Camelus; D002247:Carbon Isotopes; D003106:Colon / Q000378:metabolism*; D005285:Fermentation; D006801:Humans; D006859:Hydrogen / Q000378:metabolism; D007231:Infant, Newborn; D007234:Infant, Premature / Q000378:metabolism*; D007785:Lactose / Q000378:metabolism; D008954:Models, Biological; D012756:Sheep
chemical_list: D000085:Acetates; D002247:Carbon Isotopes; D006859:Hydrogen; D007785:Lactose; D019342:Acetic Acid