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Abstract
Mannans of different structure and composition are renewable bioresources that can be widely found as components of lignocellulosic biomass in softwood and agricultural wastes, as non-starch reserve polysaccharides in endosperms and vacuoles of a wide variety of plants, as well as a major component of yeast cell walls. Enzymatic hydrolysis of mannans using mannanases is essential in the pre-treatment step during the production of second-generation biofuels and for the production of potentially health-promoting manno-oligosaccharides (MOS). In addition, mannan-degrading enzymes can be employed in various biotechnological applications, such as cleansing and food industries. In this review, fundamental knowledge of mannan structures, sources and functions will be summarized. An update on various aspects of mannan-degrading enzymes as well as the current status of their production, and a critical analysis of the potential application of MOS in food and feed industries will be given. Finally, emerging areas of research on mannan biotechnology will be highlighted.
Declaration of interest
S. K. is supported by the Royal Golden Jubilee (RGJ) scholarship, Thailand Research Fund (TRF). W. S. is supported by grants from the Higher Education Research Promotion and National Research University Project of Thailand, Office of the Higher Education Commission and Suranaree University of Technology (SUT). M. Y. and D. H. are academic representatives of MoU between SUT and BOKU.