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Beeturia and colonic oxalic acid.
QJM. 1995 Oct; 88(10):711-7.QJM

Abstract

Beeturia is the excretion of red beetroot pigment (betalaine) in urine and faeces. It occurs in about 14% of humans. Betalaine is a redox indicator whose colour is protected by reducing agents. We investigated pigment-decolourizing systems in the intestinal tracts of beeturic and non-beeturic subjects. Betalaine was decolourized by hydrochloric acid, ferric ions and colonic bacteria preparations, but not by pancreatic or mucosal enzymes. In animals, oral betalaine did not produce beeturia, but injection of betalaine into the peritoneum did. Oral betalaine and 1 g oxalic acid produced beeturia in non-beeturic normal humans, but passed into ileostomies without beeturia. Thus, beeturia results from colonic absorption of betalaine. Oxalic acid preserves the red colour to the colon, otherwise it is decolourized in non-beeturic individuals by non-enzymic processes in the stomach and colon.

Authors+Show Affiliations

Department of Medicine, University of Edinburgh, Western General Hospital, UK.No affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

7493168

Citation

Eastwood, M A., and H Nyhlin. "Beeturia and Colonic Oxalic Acid." QJM : Monthly Journal of the Association of Physicians, vol. 88, no. 10, 1995, pp. 711-7.
Eastwood MA, Nyhlin H. Beeturia and colonic oxalic acid. QJM. 1995;88(10):711-7.
Eastwood, M. A., & Nyhlin, H. (1995). Beeturia and colonic oxalic acid. QJM : Monthly Journal of the Association of Physicians, 88(10), 711-7.
Eastwood MA, Nyhlin H. Beeturia and Colonic Oxalic Acid. QJM. 1995;88(10):711-7. PubMed PMID: 7493168.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Beeturia and colonic oxalic acid. AU - Eastwood,M A, AU - Nyhlin,H, PY - 1995/10/1/pubmed PY - 1995/10/1/medline PY - 1995/10/1/entrez SP - 711 EP - 7 JF - QJM : monthly journal of the Association of Physicians JO - QJM VL - 88 IS - 10 N2 - Beeturia is the excretion of red beetroot pigment (betalaine) in urine and faeces. It occurs in about 14% of humans. Betalaine is a redox indicator whose colour is protected by reducing agents. We investigated pigment-decolourizing systems in the intestinal tracts of beeturic and non-beeturic subjects. Betalaine was decolourized by hydrochloric acid, ferric ions and colonic bacteria preparations, but not by pancreatic or mucosal enzymes. In animals, oral betalaine did not produce beeturia, but injection of betalaine into the peritoneum did. Oral betalaine and 1 g oxalic acid produced beeturia in non-beeturic normal humans, but passed into ileostomies without beeturia. Thus, beeturia results from colonic absorption of betalaine. Oxalic acid preserves the red colour to the colon, otherwise it is decolourized in non-beeturic individuals by non-enzymic processes in the stomach and colon. SN - 1460-2725 UR - https://www.unboundmedicine.com/medline/citation/7493168/Beeturia_and_colonic_oxalic_acid_ L2 - http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=7493168.ui DB - PRIME DP - Unbound Medicine ER -