Department of Food Engineering and Technology, Sant Longowal Institute of Engineering and Technology, Longowal, 148106 Sangrur, Punjab, India.
Department of Food Engineering and Technology, Sant Longowal Institute of Engineering and Technology, Longowal, 148106 Sangrur, Punjab, India.
Int J Biol Macromol. 2018 Oct 15;118(Pt A):141-148. doi: 10.1016/j.ijbiomac.2018.06.064. Epub 2018 Jul 20.
β-glucan extracted from raw and germinated foxtail and kodo millets were evaluated for its functional, rheological and in vitro antioxidant characteristics. The in vitro activity determined in terms of diphenyl-p-picryl hydrazy (DPPH) radical scavenging activity and Ferric reducing antioxidant power (FRAP) activity was found higher in germinated kodo millet (78.74%, 48.98%) compared to foxtail millet (34.96%, 38.67%), respectively. Water binding capacity and swelling power of β-glucan extract of foxtail millet increased from 2.88 g/g to 3.06 g/g and 1.32 g/g to 1.67 g/g and that of kodo millet from 3.45 to 3.99 g/g and 2.54 to 2.99 g/g, respectively, after germination. There was a significant improvement in foaming capacity and stability of β-glucan after germination. The 'n' values were less than unity indicated that β-glucan extracts behaved pseudo-plastic like material. The storage modus (G') of β-glucan extracts of germinated kodo millet was higher than foxtail millets, as well as overall higher than the loss modulus (G″) indicating a dominantly viscoelastic behaviour and stability. Peak tanδ was lower for germinated foxtail millet compared to kodo millet indicating more stable gel of the former. Therefore, improvements in the functional as well rheological properties of β-glucan could be exploited in food and pharmaceutical industries.
从生和发芽的粟米和黑青稞中提取的β-葡聚糖，其功能、流变学和体外抗氧化特性进行了评估。根据二苯基-1-苦基肼（DPPH）自由基清除活性和铁还原抗氧化能力（FRAP）活性测定的体外活性，发芽的黑青稞（78.74%、48.98%）比粟米（34.96%、38.67%）更高。粟米β-葡聚糖提取物的水结合能力和膨胀能力分别从 2.88 g/g 增加到 3.06 g/g 和从 1.32 g/g 增加到 1.67 g/g，黑青稞从 3.45 g/g 增加到 3.99 g/g 和从 2.54 g/g 增加到 2.99 g/g。发芽后，β-葡聚糖的泡沫能力和稳定性有显著提高。“n”值小于 1 表明β-葡聚糖提取物表现出假塑性物质的行为。发芽黑青稞β-葡聚糖提取物的储能模量（G'）高于粟米，损耗模量（G"）也高于损耗模量，表明其具有明显的粘弹性行为和稳定性。与黑青稞相比，发芽粟米的峰值 tanδ 较低，表明前者的凝胶更稳定。因此，β-葡聚糖功能和流变性能的提高可以在食品和制药行业得到利用。
