Modif ication of Canna Starch by Cross-linking with Sodium Trimetaphosphate

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Isaraporn Emrat
King Mongkut’s University of Technology Thonburi, Takham, Bangkhuntien, Bangkok 10150
Yuree Wandee
King Mongkut’s University of Technology Thonburi, Takham, Bangkhuntien, Bangkok 10150
Santhanee Puncha-arnon
King Mongkut’s University of Technology Thonburi, Takham, Bangkhuntien, Bangkok 10150
Dudsadee Uttapap
King Mongkut’s University of Technology Thonburi, Takham, Bangkhuntien, Bangkok 10150
Chureerat Puttanlek
Silpakorn University, Nakorn Pathom 73000
Vilai Rungsardthong
King Mongkut’s University of Technology North Bangkok, Wong Sawang, Bangsue, Bangkok 10800

Abstract

Edible canna starch (Thai-green canna) was cross-linked with different concentrations (0.005%,0.01%, 0.05%, 0.1%, 0.2%, and 0.5%) of sodium trimetaphosphate (STMP) at 40°C, pH 5.5 for 2 h.Modified starches contained 0.032% – 0.042% of phosphorus content. Scanning electron micrographsshowed that the granular size and shape of the modified starch granules were similar to those of the nativestarch granules. Investigation on pasting properties of 6% w/w starch using Rapid Visco Analyzer (RVA)revealed that peak viscosities of cross-linked starches increased with increasing concentration of STMPfrom 0.005% to 0.05%, but decreased when concentration of STMP was further increased (from 0.1% to0.5%). Most of the modified starches exhibited lower setback. Stability of the cross-linked starches to lowpH was not improved, whereas that to high shear was superior when compared to the native starch. Starchesmodified with 0.01% – 0.05% STMP had higher freeze-thaw stability than the native starch.

Keywords : Canna Starch / Modification / Cross-linking / Sodium Trimetaphosphate

Article Details

Issue
Vol. 34 No. 4 (2011): October - December
Section
Original Articles
Author Biographies

Isaraporn Emrat, King Mongkut’s University of Technology Thonburi, Takham, Bangkhuntien, Bangkok 10150

Graduate Student, Division of Biochemical Technology, School of Bioresources and Technology.

Yuree Wandee, King Mongkut’s University of Technology Thonburi, Takham, Bangkhuntien, Bangkok 10150

Researcher, Division of Biochemical Technology, School of Bioresources and Technology.

Santhanee Puncha-arnon, King Mongkut’s University of Technology Thonburi, Takham, Bangkhuntien, Bangkok 10150

Researcher, Division of Biochemical Technology, School of Bioresources and Technology.

Dudsadee Uttapap, King Mongkut’s University of Technology Thonburi, Takham, Bangkhuntien, Bangkok 10150

Associate Professor, Division of Biochemical Technology, School of Bioresources and Technology.

Chureerat Puttanlek, Silpakorn University, Nakorn Pathom 73000

Assistant Professor, Department of Biotechnology, Faculty of Engineering and Industrial Technology.

Vilai Rungsardthong, King Mongkut’s University of Technology North Bangkok, Wong Sawang, Bangsue, Bangkok 10800

Associate Professor, Department of Agro-Industrial Technology, Faculty of Applied Science.