formaldehyde - Sciencemadness Dot Org

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FORMALDEHYDE
H'iris \.\\i. :\j: acid .side of the isoelectric point. However, some protein*
apparent::-- diner considerably in this respect, since Oku 82 reports that maximum
fixation ui formaldehyde by .serieln is obtained in the presence of 2
per cent hydrochloric or .sulfuric acid.
XauiruUw reactivity with formaldehyde varies for different protein
type.- and i^ probably dependent on the proportion of active amino and
amido groups. The maximum amount of formaldehyde fixed by gelatin
Is reported to be approximately 4.0 to 4.S grams per 100 grams of protein 75 ,
whereas casein fixes a maximum of only 0.6 to 2.5 grams per 100 gram.s s l
The besr grades of glue, which possess high jelly values and set quickly to
give strong bonds, require less formaldehyde to effect Insolubi Liza t ion than
do the lower grades 9 .
References
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