Carotenoid contents of extruded and non-extruded sweetpotato flours from Papua New Guinea and Australia

Waramboi, Joel G., Gidley, Michael J. and Sopade, Peter A. (2013) Carotenoid contents of extruded and non-extruded sweetpotato flours from Papua New Guinea and Australia. Food Chemistry, 141 3: 1740-1746. doi:10.1016/j.foodchem.2013.04.070


Author Waramboi, Joel G.
Gidley, Michael J.
Sopade, Peter A.
Title Carotenoid contents of extruded and non-extruded sweetpotato flours from Papua New Guinea and Australia
Journal name Food Chemistry   Check publisher's open access policy
ISSN 0308-8146
1873-7072
Publication date 2013-12-01
Year available 2013
Sub-type Article (original research)
DOI 10.1016/j.foodchem.2013.04.070
Open Access Status DOI
Volume 141
Issue 3
Start page 1740
End page 1746
Total pages 7
Place of publication Amsterdam, Netherlands
Publisher Elsevier BV
Language eng
Formatted abstract
Carotenoid contents of extruded and non-extruded flours of Papua New Guinean and Australian sweet-potato cultivars were studied, using spectrophotometry and high performance liquid chromatography (HPLC). The cultivars differed (p < 0.05) in their total carotenoid and β-carotene contents, and the Original Beauregard cultivar had the highest total carotenoid and β-carotene contents among the cultivars. The spectrophotometry (84.1720 μg/g solids) method generally over-estimated the total carotenoid content compared to the more specific HPLC (23.355 μg/g solids) method. Extrusion significantly (p < 0.05) decreased the ΔL*. Hunter colour values, while the Δa*., Δb*., total colour change (ΔE), chroma (CR), and browning indices (BI) increased. With the extruder and screw configuration used, extrusion at 40% moisture and 300 rpm screw speed retained carotenoid maximally at more than 80%. This study reports, for the first time, carotenoids of flours from south Pacific sweetpotato cultivars, and carotenoid retention during extrusion.
Keyword β-carotene
Carotenoid retention
Colour
Extrusion
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Agriculture and Food Sciences
Queensland Alliance for Agriculture and Food Innovation
Official 2014 Collection
 
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