Zein−iodine complex studied by FTIR spectroscopy and dielectric and dynamic rheometry in films and precipitates

Narpinder Singh; Dominique M R Georget; Peter S Belton; Susan A Barker

doi:10.1021/jf900436q

Zein−iodine complex studied by FTIR spectroscopy and dielectric and dynamic rheometry in films and precipitates

Narpinder Singh, Dominique M R Georget, Peter S Belton, Susan A Barker

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35 Citations (Scopus)

Abstract

In the present study the effect of iodine on properties of zein films and zein precipitates obtained after hydrophobic aggregation was evaluated. Zein films were cast with and without glycerol (as plasticizer) after incorporation of iodine at different levels (2-8%, zein wt basis). Zein films were characterized by secondary structure (determined by infrared spectroscopy) and dielectric and mechanical properties. The rheological properties of zein precipitates as a function of frequency and temperature were evaluated using a dynamic rheometer. Inclusion of iodine changed the secondary structure of zein films and decreased their tensile strength as well as strain at failure. In aggregates, changes in G' (elastic modulus) and G'' (viscous modulus) during heating were affected by the presence of iodine due to the inhibition of aggregation. The water-holding capacity of precipitates precipitated in the presence of iodine was higher than that of those without iodine.

Original language	English
Pages (from-to)	4334-4341
Number of pages	8
Journal	Journal of Agricultural and Food Chemistry
Volume	57
Issue number	10
DOIs	https://doi.org/10.1021/jf900436q
Publication status	Published - 15 Apr 2009

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10.1021/jf900436q

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title = "Zein−iodine complex studied by FTIR spectroscopy and dielectric and dynamic rheometry in films and precipitates",

abstract = "In the present study the effect of iodine on properties of zein films and zein precipitates obtained after hydrophobic aggregation was evaluated. Zein films were cast with and without glycerol (as plasticizer) after incorporation of iodine at different levels (2-8%, zein wt basis). Zein films were characterized by secondary structure (determined by infrared spectroscopy) and dielectric and mechanical properties. The rheological properties of zein precipitates as a function of frequency and temperature were evaluated using a dynamic rheometer. Inclusion of iodine changed the secondary structure of zein films and decreased their tensile strength as well as strain at failure. In aggregates, changes in G' (elastic modulus) and G'' (viscous modulus) during heating were affected by the presence of iodine due to the inhibition of aggregation. The water-holding capacity of precipitates precipitated in the presence of iodine was higher than that of those without iodine.",

author = "Narpinder Singh and Georget, {Dominique M R} and Belton, {Peter S} and Barker, {Susan A}",

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T1 - Zein−iodine complex studied by FTIR spectroscopy and dielectric and dynamic rheometry in films and precipitates

AU - Singh, Narpinder

AU - Georget, Dominique M R

AU - Belton, Peter S

AU - Barker, Susan A

PY - 2009/4/15

Y1 - 2009/4/15

N2 - In the present study the effect of iodine on properties of zein films and zein precipitates obtained after hydrophobic aggregation was evaluated. Zein films were cast with and without glycerol (as plasticizer) after incorporation of iodine at different levels (2-8%, zein wt basis). Zein films were characterized by secondary structure (determined by infrared spectroscopy) and dielectric and mechanical properties. The rheological properties of zein precipitates as a function of frequency and temperature were evaluated using a dynamic rheometer. Inclusion of iodine changed the secondary structure of zein films and decreased their tensile strength as well as strain at failure. In aggregates, changes in G' (elastic modulus) and G'' (viscous modulus) during heating were affected by the presence of iodine due to the inhibition of aggregation. The water-holding capacity of precipitates precipitated in the presence of iodine was higher than that of those without iodine.

AB - In the present study the effect of iodine on properties of zein films and zein precipitates obtained after hydrophobic aggregation was evaluated. Zein films were cast with and without glycerol (as plasticizer) after incorporation of iodine at different levels (2-8%, zein wt basis). Zein films were characterized by secondary structure (determined by infrared spectroscopy) and dielectric and mechanical properties. The rheological properties of zein precipitates as a function of frequency and temperature were evaluated using a dynamic rheometer. Inclusion of iodine changed the secondary structure of zein films and decreased their tensile strength as well as strain at failure. In aggregates, changes in G' (elastic modulus) and G'' (viscous modulus) during heating were affected by the presence of iodine due to the inhibition of aggregation. The water-holding capacity of precipitates precipitated in the presence of iodine was higher than that of those without iodine.

U2 - 10.1021/jf900436q

DO - 10.1021/jf900436q

M3 - Article

SN - 1520-5118

VL - 57

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EP - 4341

JO - Journal of Agricultural and Food Chemistry

JF - Journal of Agricultural and Food Chemistry

IS - 10

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