Ultra-high pressure LC for astaxanthin determination in shrimp by-products and active food packaging

Abstract

Nowadays, there is increasing interest in natural antioxidants from food by-products. Astaxanthin is a potent antioxidant and one of the major carotenoids in crustaceans and salmonids. An ultra-high pressure liquid chromatographic method was developed and validated for the determination of astaxanthin in shrimp by-products, and its migration from new packaging materials to food simulants was also studied. The method uses an UPLCW BEH guard-column (2.1 x 5 mm, 1.7mm particle size) and an UPLCW BEH analytical column (2.1 x 50 mm, 1.7mm particle size). Chromatographic separation was achieved using a programmed gradient mobile phase consisting of (A) acetonitrile–methanol (containing 0.05 M ammonium acetate)–dichloromethane (75:20:5, v/v/v) and (B) ultrapure water. This method was evaluated with respect to validation parameters such as linearity, precision, limit of detection, limit of quantification and recovery. Low-density polyethylene films were prepared with different amounts of the lipid fraction of fermented shrimp waste by extrusion, and migration was evaluated into food simulants (isooctane and ethanol 95%, v/v). Migration was not detected under the tested conditions.This work was funded under Project no. 95935 by FONCICYT C002-2008-1/ALA – 127 249. The authors are grateful for the postdoctoral contract of Ana Sanches Silva in the frame of the Program ‘Science 2007’, funded by Fundação para a Ciência e a Tecnologia, Portugal