Amorphous-amorphous phase separation in hydrophobically-modified starch-sucrose blends II. Crystallinity and local free volume investigation using wide-angle X-ray scattering and positron annihilation lifetime spectroscopy

被引：18

作者：

Hughes, David ^{[1
]}

Tedeschi, Concetta ^{[2
]}

Leuenberger, Bruno ^{[2
]}

Roussenova, Mina ^{[1
]}

Coveney, Abigail ^{[3
]}

Richardson, Robert ^{[1
]}

Boenisch, Gabriela Badolato ^{[2
]}

Alam, M. Ashraf ^{[1
]}

Ubbink, Job ^{[1
,4
]}

机构：

[1] Univ Bristol, HH Wills Phys Lab, Tyndall Ave, Bristol BS8 1TL, Avon, England

[2] DSM Nutr Prod AG, Res Ctr Formulat & Applicat, POB 2676, CH-4002 Basel, Switzerland

[3] Univ Bristol, HH Wills Phys Lab, Bristol Ctr Funct Nanomat, Tyndall Ave, Bristol BS8 1TL, Avon, England

[4] Food Concept & Phys Design Mill, Muhleweg 10, CH-4112 Fluh, Switzerland

来源：

FOOD HYDROCOLLOIDS | 2016年 / 58卷

基金：

英国工程与自然科学研究理事会;

关键词：

Plasticization; Antiplasticization; Glass transition; Sucrose; OSA starch; Free volume; MOLECULAR PACKING; WATER; TEMPERATURE; MATRICES; STABILITY;

D O I：

10.1016/j.foodhyd.2016.02.024

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

Positron Annihilation Lifetime Spectroscopy (PALS) has been employed to characterize the temperature dependence of the local free volume of hydrophobically-modified starch (HMS) - sucrose (S) blends as a function of blend composition and water content. The findings from PALS support the conclusions drawn from thermodynamic characterization using Differential Scanning Calorimetry (DSC) showing evidence of limited phase separation between the HMS and S phases, inferred from the drastic change in the temperature dependence of the average size of the local free volume element as a function of blend composition. The effect of water content on the average local free volume element size is in good agreement with previous studies on simpler carbohydrate polymer/low molecular weight inclusion blends, however, the width of the free volume distribution is also observed to be affected by water content. This is interpreted to be related to the heterogeneity of the free volume holes, which is higher for phase-separated systems comprising phases of different composition and molecular weight distribution. Wide angle X-ray scattering (WAXS) was employed to study the crystallinity of the blends, showing limited crystallinity is present in the blends at the highest water contents with origin in the corn starch (CS) added during processing, and not the HMS and S phases. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：316 / 323

页数：8

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