Document Detail

The isoflavone content of commercially-available feline diets in New Zealand.
MedLine Citation:
PMID:  16751839     Owner:  NLM     Status:  MEDLINE    
AIM: To identify and quantify concentrations of the isoflavones genistein, daidzein, biochanin A and formononetin in commercially- prepared feline diets sold in New Zealand. METHODS: Feline diets (n=138) were collected from supermarkets, pet stores and veterinary clinics in New Zealand. Diets were classified into five categories based on the following criteria: the presence/absence of soy, the presence/absence of non-soy plant material, and dry matter (DM) content. A high performance liquid chromatography (HPLC)-based assay was developed and validated to identify and quantify concentrations of the isoflavones genistein, daidzein, biochanin A and formononetin. RESULTS: Isoflavones were detected in all categories of diet, and at quantifiable concentrations in 104/138 (75%) of the diets tested. More dry diets (127/138; 92%) contained isoflavones at quantifiable concentrations than moist diets (83/138; 60%, p<0.001). Of the isoflavone-positive diets, moist diets that contained soy had the highest median isoflavone content (71.1 mg/kg DM and 0.018 mg/kcal metabolisable energy; ME) whilst moist meat-only diets had the lowest (3.24 mg/kg DM and 0.0004 mg/kcal ME). Isoflavone contents varied similarly between categories of diet whether evaluated on a DM or ME basis. High isoflavone contents were associated with diets containing soy and those of low cost. Biochanin A and formononetin were found at concentrations above the detection limit of the assay in 25/138 (18%) and 7/138 (5%) of the diets analysed, respectively. The estimated median daily isoflavone exposure for cats consuming feline diets sold in New Zealand ranged from 0.03 mg/kg bodyweight (BW) for moist meat-only diets to 1.47 mg/kg BW for moist diets containing soy, whilst the diet with the highest isoflavone content would provide daily exposure of 8.13 mg/kg BW. CONCLUSIONS: Isoflavones are present in commercially-prepared feline diets sold in New Zealand at concentrations that have elicited physiological responses in the reproductive, endocrine, and immune systems of other mammalian species. Since isoflavones appear to be a common constituent of feline diets, further investigation of the biological activities of these dietary compounds in cats is warranted.
K M Bell; S M Rutherfurd; W H Hendriks
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  New Zealand veterinary journal     Volume:  54     ISSN:  0048-0169     ISO Abbreviation:  N Z Vet J     Publication Date:  2006 Jun 
Date Detail:
Created Date:  2006-06-05     Completed Date:  2006-08-01     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0021406     Medline TA:  N Z Vet J     Country:  New Zealand    
Other Details:
Languages:  eng     Pagination:  103-8     Citation Subset:  IM    
Institute of Food, Nutrition and Human Health, Massey University, Private Bag 11222, Palmerston North, New Zealand.
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MeSH Terms
Animal Feed / analysis*,  standards
Animal Nutritional Physiological Phenomena*
Animal Welfare
Chromatography, High Pressure Liquid
Gas Chromatography-Mass Spectrometry
Isoflavones / analysis*,  physiology
New Zealand
Reg. No./Substance:
Erratum In:
N Z Vet J. 2006 Dec;54(6):366

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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