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Arabinoxylan Microspheres: Structural and Textural Characteristics
Laboratory of Biopolymers, CTAOA. Research Center for Food and Development, CIAD, A.C. Carretera a La Victoria Km. 0.6, Hermosillo, Sonora, 83000 Mexico
Centro de Investigación en Materiales Avanzados S.C. Miguel de Cervantes 120, Chihuahua, Chih. CP 31109, Mexico
Laboratory of Biotechnology, CTAOV. Research Center for Food and Development, CIAD, A.C. Carretera a La Victoria Km. 0.6, Hermosillo, Sonora, 83000 Mexico
* Author to whom correspondence should be addressed.
Received: 8 February 2013; in revised form: 7 April 2013 / Accepted: 8 April 2013 / Published: 19 April 2013
Abstract: The aim of this research was to study the structural and textural characteristics of maize bran arabinoxylan (MBAX) microspheres. The laccase-induced cross-linking process was monitored by storage (G') and loss (G'') moduli changes in a 4% (w/v) MBAX solution. The G' and G'' values at the plateau region were 215 and 4 Pa, respectively. After gelation, the content of ferulic acid dimers decreased from 0.135 to 0.03 µg/mg MBAX, suggesting the formation of ferulated structures unreleased by mild alkaline hydrolysis. MBAX microspheres presented an average diameter of 531 µm and a swelling ratio value (q) of 18 g water/g MBAX. The structural parameters of MBAX microspheres were calculated from equilibrium swelling experiments, presenting an average mesh size of 52 nm. Microstructure and textural properties of dried MBAX microspheres were studied by scanning electron microscopy and nitrogen adsorption/desorption isotherms, respectively, showing a heterogeneous mesoporous and macroporous structure throughout the network.
Keywords: maize bran arabinoxylans; microspheres; ferulic acid; microstructure
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Martínez-López, A.L.; Carvajal-Millan, E.; Miki-Yoshida, M.; Alvarez-Contreras, L.; Rascón-Chu, A.; Lizardi-Mendoza, J.; López-Franco, Y. Arabinoxylan Microspheres: Structural and Textural Characteristics. Molecules 2013, 18, 4640-4650.
Martínez-López AL, Carvajal-Millan E, Miki-Yoshida M, Alvarez-Contreras L, Rascón-Chu A, Lizardi-Mendoza J, López-Franco Y. Arabinoxylan Microspheres: Structural and Textural Characteristics. Molecules. 2013; 18(4):4640-4650.
Martínez-López, Ana L.; Carvajal-Millan, Elizabeth; Miki-Yoshida, Mario; Alvarez-Contreras, Lorena; Rascón-Chu, Agustín; Lizardi-Mendoza, Jaime; López-Franco, Yolanda. 2013. "Arabinoxylan Microspheres: Structural and Textural Characteristics." Molecules 18, no. 4: 4640-4650.