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Spectrophotometric method of controlled pheophytinization for the determination of both chlorophylls and pheophytins in plant extracts

✍ Scribed by Danielle L. Laval-Martin

Publisher
Elsevier Science
Year
1985
Tongue
English
Weight
678 KB
Volume
149
Category
Article
ISSN
0003-2697

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✦ Synopsis

Conventional spectrophotometric methods of chlorophyll (Chl) measurement with doublewavelength readings of absorbances corresponding to the peak values of both Chl a and Chl b are usable only is pheophytins (Pheo) are absent in the pigment extract. We present here a kinetic method of controlled phenophytinization of the Chl present in acetone/water (90/10, v/v) exctracts that allows the measurement of both Chl u and b, as well as of the initial Pheo preexisting in the plant material at the moment of the extraction. This method gives better accuracy in Chl b determination than conventional methods, particularly when Chl a/Chl b ratios are greater than 5. Examples are given illustrating the usefulness of this method. 81 1985 Academic Press. Inc.

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