Turmeric dye extraction residue for use in bioactive film production: Optimization of turmeric film plasticized with glycerol

Author(s)

Maniglia, B. C. ^[1] ; de Paula, R. L. ^[1] ; Domingos, J. R. ^[1] ; Tapia-Blacido, D. R. ^[1]

Affiliation

^[1] Univ Sao Paulo, Fac Filosofia Ciencias & Letras, Dept Quim, BR-14040901 Ribeirao Preto - Brazil

• Document type: Journal article
• Source: LWT-FOOD SCIENCE AND TECHNOLOGY; v. 64, n. 2, p. 1187-1195, DEC 2015.
• Web of Science Citations: 11

Abstract

Four turmeric flour fractions (F1, F2, F3, and F4) were produced from the turmeric dye extraction residue by wet milling and sieving for film production. F2, which presented the lowest lignocellulosic and the highest starch content, provided the best material for film production. The main objectives of the present study were (i) to evaluate the effect of heating temperature (T) and pH on the mechanical and functional properties of F2 film plasticized with glycerol, and (ii) to optimize the process conditions (T, pH) by response surface method and multi-response analyses. Higher T (>90 degrees C) and alkaline pH produced a denser and mechanically stronger polymer matrix and more soluble film. In contrast, less soluble films were produced at intermediate T and pH. The effect of T and pH on the mechanical properties and solubility of turmeric films is associated with starch gelatinization and protein solubilization and denaturation. High T produced loss of the curcuminoids and antioxidant activity of turmeric films. The optimal conditions were T of 85.1 degrees C and pH of 8.1. These conditions yielded films with high mechanical strength (9 MPa), low solubility (37%), and low water vapor permeability (0.352 g mm h(-1) m(-2) kPa(-1)). (C) 2015 Elsevier Ltd. All rights reserved. (AU)

• FAPESP's process: 09/14610-0 - Use of agro-industrial residues in the elaboration of bioactive films
• Grantee: Delia Rita Tapia Blácido
• Support Opportunities: Research Grants - Young Investigators Grants