Effect of high voltage atmospheric cold plasma on extraction of fenugreek galactomannan and its physicochemical properties. (December 2020)

• Record Type: Journal Article
• Authors: Rashid, Farhat; Bao, Yiwen; Ahmed, Zaheer; Huang, Jen-Yi
• Is Part Of: Food research international. Volume 138(2020)Part A
• Publication Date: 2020-12
• Subjects: Cold plasma-assisted extraction -- Polysaccharides -- Surface modification -- Extraction enhancement -- Functional properties; DBD dielectric barrier discharge -- DS crushed dry seeds -- DSC differential scanning calorimetry -- FG Fenugreek galactomannan -- FTIR Fourier-transform infrared spectroscopy -- GP dried fenugreek galactomannan powder extracted from the control seeds -- HVACP high voltage atmospheric cold plasma -- SEM scanning electron microscopy -- SI swelling index -- SS crushed seeds soaked in extracting solutions -- WBC water binding capacity -- XRD X-ray diffraction; Food -- Analysis -- Periodicals; Food industry and trade -- Periodicals; Food industry and trade -- Canada -- Periodicals; Food Technology -- Periodicals; Food -- Periodicals; Food-Processing Industry -- Periodicals; Aliments -- Industrie et commerce -- Périodiques; Aliments -- Industrie et commerce -- Canada -- Périodiques; Aliments -- Recherche -- Périodiques; Food industry and trade; Canada; Periodicals; Electronic journals; 664.005
• DOI: 10.1016/j.foodres.2020.109776
• Languages: English
• ISSNs: 0963-9969

Abstract

Graphical abstract: Highlights: Fenugreek seeds treated with cold plasma showed apparent surface ruptures. Cold plasma treatment largely increased extraction yield of fenugreek galactomannan. Plasma-treated galactomannan had higher water binding capacity, swelling index and apparent viscosity. Cold plasma treatment had insignificant effect on molecular and crystalline structures of galactomannan. 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.