Determination of free and loosely protein-bound formaldehyde in the tissues of pigs fed formalin-treated skim milk as a protein supplement
✍ Scribed by Eric Florence; Douglas F. Milner
- Publisher
- John Wiley and Sons
- Year
- 1981
- Tongue
- English
- Weight
- 292 KB
- Volume
- 32
- Category
- Article
- ISSN
- 0022-5142
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✦ Synopsis
Abstract
Skim milk containing 0.1% formalin (0.4 g formaldehyde litre‐^1^) was fed to pigs and their growth rate compared with control pigs fed a formalin‐free meal diet. Formalin‐treated milk and tissues from control and experimental animals were analysed for residual formaldehyde, present as free and loosely protein‐bound, by a colorimetric determination using chromotropic acid. Some 20% of the formaldehyde added to milk was irrecoverable after 7 days' storage, probably due to irreversible binding to protein. Mean concentrations of residual formaldehyde in tissues taken from experimental and control pigs were 19.7 and 20.2 mg kg‐^1^, respectively. This indicates that excess residual formaldehyde is not present in tissues of pigs fed formalin‐treated skim milk.