Thermal analysis of some natural polysaccharide materials by isoconversional method.

Abstract:

:Isoconversional thermal analysis of some important polysaccharides from functional foods is reported. Various thermal parameters including apparent activation energy (Ea), pre-exponential factor (A) were worked out, and the fitness of data to different models describing the degradation kinetics of polysaccharides was studied. The polysaccharides from Mimosa pudica (MP), Plantago ovata (PO), Argyreia speciosa (AS), Acacia nilotica (AN), P. ovata husk (HK) and Acacia modesta (AM) exhibited multistep degradation while those from Astragalus gummifer (AG), Salvia aegyptiaca (SA) and Ocimum basicilicum (OB) degraded mainly in single step. Generally, the degradation was exothermal. The average Ea values as determined by Flynn-Wall-Ozawa method were found to be in the range 132-187 kJ mol(-1). The mean comprehensive index of thermal stability (ITS) fell in the range 0.33-0.43. All the materials under investigation except those from SA and AS appear to be as stable as some of the important commercial materials used as pharmaceutical ingredients. Model-fitting analysis revealed that the major degradation step follows first-order kinetics.

journal_name

Food Chem

journal_title

Food chemistry

authors

Iqbal MS,Massey S,Akbar J,Ashraf CM,Masih R

doi

10.1016/j.foodchem.2013.02.047

subject

Has Abstract

pub_date

2013-09-01 00:00:00

pages

178-82

issue

1-2

eissn

0308-8146

issn

1873-7072

pii

S0308-8146(13)00206-9

journal_volume

140

pub_type

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