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KMID : 1024420100140020127
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Food Engineering Progress
2010 Volume.14 No. 2 p.127 ~ p.134
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Physicochemical Properties of Extruded Defatted Hemp Seed and Its Energy Bar Manufacturing
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Gu Bon-Jae
Norajit Krittika
Ryu Gi-Hyung
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Abstract
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This study was to develop high-nutritious energy bar from extruded hemp obtained by extrusion process. Mixture of rice flour and defatted hemp was extruded at a barrel temperature of 110 and 130oC, and moisture content of 20 and 25%. Properties of extrudates such as bulk density, expansion index, breaking strength, apparent elastic modulus, water absorption index (WAI), water solubility index (WSI) have been analyzed. The antioxidant potential was determined by the DPPH-radical scavenging assay. The expansion index was the highest in rice-hemp extrudate at 130oC barrel temperature and 20% moisture content among the other hemp-added extrudates. The WAI was increased with increase in moisture content, while the WSI was increased with increase in barrel temperature. The peak viscosity of rice extrudate had higher valule than those of extrudate added with hemp. DPPH scavenging activity of rice-hemp extrudate at 130oC barrel temperature and 20% moisture content showed the highest value. Sensory properties, moisture content and color were assessed for quality of energy bar. The color values of the energy bar indicated decreasing L (lightness) and b (yellowness), and increasing a (redness) after 30 days storage at ambient condition. The highest overall acceptable was the energy bar added with rice-hemp extrudate at 130oC barrel temperature and 20% moisture content.
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KEYWORD
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extrusion process, extruded hemp, physicochemical properties, energy bar
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