Effect of red seaweed polysaccharides agar (gracilaria changii) on thermal properties and microstructure of wheat starch

P. Khairul Faizal, H. Rohasmizah, Abd. Salam Babji, Norrakiah Abdullah Sani

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

This study has been carried out on the mixture of Gracilaria changii agar (0.1%, 0.2%, 0.4% and 0.8%) with wheat starch. Scanning electron microscopy (SEM) was performed for morphology observation, and starch thermal analysis were carried out to determine the properties of gelatinization and retrogradation. Proximate analysis has been determined for isolated wheat starch and agar. Through SEM, interaction was first observed at 64°Cfor 0.4% agar but at 0.8% of agar, a more extensive bridging was formed which enveloped the starch granules. Differential scanning calorimetric (DSC) result shows that the addition of agar decreased the onset temperature (T) of gelatinization significantly (p<0.05) but increased the gelatinized enthalpy (△H gel), gelatinized temperature range (Rg) and Peak Height Index (PHI) significantly (p<0.05). Agar lowered the retrogradation enthalpy (△Hret), retrogradation range (Rret) and retrogradation percentage (%R) of wheat starch significantly (p<0.05).

Original languageEnglish
Pages (from-to)341-345
Number of pages5
JournalSains Malaysiana
Volume38
Issue number3
Publication statusPublished - Jun 2009

Fingerprint

Gracilaria
wheat starch
thermal properties
microstructure
macroalgae
retrogradation
polysaccharides
agar
enthalpy
gelatinization
scanning electron microscopy
thermal analysis
proximate composition
starch granules
starch
temperature

Keywords

  • Agar
  • Gelatinization
  • Gracilaria changii
  • Retrogradation
  • Starch granule

ASJC Scopus subject areas

  • General

Cite this

Effect of red seaweed polysaccharides agar (gracilaria changii) on thermal properties and microstructure of wheat starch. / Khairul Faizal, P.; Rohasmizah, H.; Babji, Abd. Salam; Abdullah Sani, Norrakiah.

In: Sains Malaysiana, Vol. 38, No. 3, 06.2009, p. 341-345.

Research output: Contribution to journalArticle

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