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      Effect of high voltage atmospheric cold plasma on extraction of fenugreek galactomannan and its physicochemical properties.

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          Abstract

          Fenugreek is a good source of galactomannan, however, conventional methods for its extraction are generally time-consuming and have relatively low recovery rates. In this study, we applied high voltage atmospheric cold plasma (HVACP) as a pretreatment and investigated its effects on galactomannan extraction from dry fenugreek seeds and soaked seeds in NaCl solution, as well as its physicochemical properties. Results showed that HVACP treatment with air at 80 kV for 30 min caused apparent structural disruption on fenugreek seed surface and decreased the pH of extracting solution, resulting in increased galactomannan extraction yields, by 122% from soaked seeds and 67% from dry seeds. Galactomannan treated with HVACP had higher water-binding capacity, swelling index and viscosity, as well as lower melting enthalpy. HVACP treatment also altered the surface morphology of galactomannan due to plasma etching, but no significant changes in its molecular and crystalline structures were observed. The findings of this study prove that HVACP can be a green approach, in terms of reduced chemical use, to effectively enhance the extraction efficiency of fenugreek galactomannan and modify its functional properties, hence facilitate more diverse applications in both food and polymer industries.

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          Author and article information

          Journal
          Food Res Int
          Food research international (Ottawa, Ont.)
          Elsevier BV
          1873-7145
          0963-9969
          December 2020
          : 138
          : Pt A
          Affiliations
          [1 ] Department of Food Science, Purdue University, West Lafayette, IN, USA; Institute of Food Science and Nutrition (IFSN), University of Sargodha, Pakistan.
          [2 ] Department of Food Science, Purdue University, West Lafayette, IN, USA.
          [3 ] Department of Environmental Design Health & Nutritional Sciences, Allama Iqbal Open University (AIOU), Islamabad, Pakistan.
          [4 ] Department of Food Science, Purdue University, West Lafayette, IN, USA; Environmental and Ecological Engineering, Purdue University, West Lafayette, IN, USA. Electronic address: huang874@purdue.edu.
          Article
          S0963-9969(20)30801-2
          10.1016/j.foodres.2020.109776
          33292954
          3ced8adf-3f5c-4386-a152-c117a9eb310c
          Copyright © 2020 Elsevier Ltd. All rights reserved.
          History

          Functional properties,Cold plasma-assisted extraction,Surface modification,Polysaccharides,Extraction enhancement

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