Starch in rubbery and glassy states by FTIR spectroscopy

Published Date

21 March 2007, Vol.68(2):249–259, doi:10.1016/j.carbpol.2006.12.015

Title 

Starch in rubbery and glassy states by FTIR spectroscopy

• Author 

• Isabelle Capron ^a,,
• Paul Robert ^a
• Paul Colonna ^a
• Maurice Brogly ^b
• Véronique Planchot ^a

• aINRA, Unité de Recherche Biopolymères, Interactions et Assemblages – rue de la géraudière, BP 71 627 – 44316 Nantes Cedex 3, France
• bCNRS, Institut de Chimie des Surfaces et Interfaces, 15 rue Jean Starcky, 68057 Mulhouse, France

Received 31 August 2006. Revised 8 December 2006. Accepted 12 December 2006. Available online 23 December 2006.

Abstract

The organization of various starch samples varying in molecular structure, organization and moisture content was studied by ATR-FTIR spectroscopy. The comparison of the infrared spectra showed that band intensities in the 1065–870 cm⁻¹ region can be explained by their mobility related to the glass transition, T_g, which occurs at room temperature in the 15–21% water content range. Spectra analyzed using principal component analysis showed main structure/moisture changes for the 1000/1022 cm⁻¹ intensity ratio. The helix organization at a short order range was weakly moisture dependant below T_g, whereas the signal became increasingly water dependant with the crystalline/amorphous ratio above T_g. This result is in agreement with the model of liquid crystal structure and mesophase variation: water allows the self-assembly of amylopectin helices leading to layered organized structure.

Keywords

Infrared

Structure

Controlled moisture

Liquid crystal model

Phase transition

Biopolymers

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