A new method for quantitative determination of protein associated with crustacean chitin.

Abstract
This method is based on hydrolysis of chitin-associated protein with 10 N NaOH in an autoclave at 121°C for 60 minutes and colorimetric determination of the ninhydrin-positive substances in the hydrolysate. In applying this method, a linear relationship was observed between protein content determined gravimetrically and absorbance of the hydrolysate-ninhydrin complex in demineralized cuticles of three prawn species, two crab species and a squilla species.

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