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Development of pectin films with pomegranate juice and citric acid

Research output: Contribution to journalArticle

Henriette Azeredo, Rosario Morrugares-Carmona, Nikolaus Wellner, Kathryn Cross, Balazs Bajka, Keith Waldron

Original languageEnglish
Pages (from-to)101-106
Publication statusPublished - May 2016

King's Authors


The influence of pomegranate juice (PJ, replacing water as solvent) and citric acid (CA) on properties of pectin films was studied. PJ provided the films with a bright red color, and acted as a plasticizer. Increasing PJ/water ratio from 0/100 to 100/0 resulted in enhanced elongation (from 2% to 20%), decreased strength (from 10 to <2 MPa) and modulus (from 93 to <10 MPa), increased water vapor permeability (WVP, from 3 to 9−1.h−1.m−2), and decreased insoluble matter (IM, from 35% to 24%). Although a crosslinking effect by CA was not confirmed, it has been suggested to occur from its effects on films. CA noticeably increased IM (from <10% to almost 40%); moreover, when measured on a dry film basis, the CA effects presented a noticeable tendency to increases strength and modulus, and to decrease WVP. The red color density was decreased by CA, suggesting a destabilization of anthocyanins

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