挤压螺杆转速对脱脂米糠中阿拉伯木聚糖水提取率及分子量分布的影响
The effect of extrusion screw-speed on the water extractability and molecular weight distribution of arabinoxylans from defatted rice bran.
作者信息
Fadel Abdulmannan, Plunkett Andrew, Ashworth Jason, Mahmoud Ayman M, Ranneh Yazan, El Mohtadi Mohamed, Li Weili
机构信息
1Department of Food and Nutrition, School of Health Psychology and Social Care, Manchester Metropolitan University, Righton Building, Cavendish Street, Manchester, M15 6BH UK.
2School of Healthcare Science, Faculty of Science and Engineering, Manchester Metropolitan University, Manchester, M1 5GD UK.
出版信息
J Food Sci Technol. 2018 Mar;55(3):1201-1206. doi: 10.1007/s13197-017-3010-0. Epub 2018 Jan 18.
Arabinoxylans (AXs) are major dietary fibre in cereals. Recently, AXs have attracted a great deal of attention because of their biological activities. These activities have been suggested to be related to the content of low molecular weight (Mw) AXs, in particular those with Mw below 32 kDa. Rice bran is a rich source of AXs. However, water extraction of AXs is difficult and often gives low yield. Extrusion processing has been used to increase the solubility of cereal dietary fibre. The aim of this research was to study the effect of extrusion screw-speeds (80 and 160) rpm on the extraction yield and Mw of water extractable AXs from rice bran. It was found that the extraction of AXs increased significantly with an increase in screw speed and was accompanied by a significant decrease in the Mw of AXs from extruded rice bran. The percentage of very low molecular weight AXs (0.79-1.58 kDa) significantly increased with increasing screw speed.
阿拉伯木聚糖（AXs）是谷物中的主要膳食纤维。最近，AXs因其生物活性而备受关注。这些活性被认为与低分子量（Mw）AXs的含量有关，特别是那些Mw低于32 kDa的AXs。米糠是AXs的丰富来源。然而，用水提取AXs很困难，且产量往往较低。挤压加工已被用于提高谷物膳食纤维的溶解度。本研究的目的是研究挤压螺杆转速（80和160）rpm对从米糠中提取的水可提取AXs的得率和Mw的影响。结果发现，AXs的提取率随着螺杆转速的增加而显著提高，同时挤压米糠中AXs的Mw显著降低。极低分子量AXs（0.79 - 1.58 kDa）的百分比随着螺杆转速的增加而显著增加。
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