Abstract
This method is based on the theory that positive polymer ions combine stoichiometrically with negative ones in a dilute solution. The solution of a positive polyelectrolyte like N-trimethylated glycol chitosan is added to a solution or a plant extract which contains pectic acid derived from pectin by demethylation of the latter with alkali, the excess of the added positive polyelectrolyte being titrated with the standard solution of a negative polyelectrolyte like potassium salt of polyvinyl sulfonate. The end-point of this titration is indicated by the color change of toluidine blue or sudden precipitation of the reactants. The amounts of pectin, expressed as pectic acid, are calculated from the difference between the results of the titration and the blank experiment. This method is also applicable to estimation of the methoxyl contents of pectin.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
More From: Bulletin of the Agricultural Chemical Society of Japan
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.