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Extraction of hemicellulose from agave bagasse for synthesis of stimuli-sensitive hybrid hydrogels and their characterization
Hemicelluloses represent an abundant family of renewable polysaccharides since they account for the majority of plant biomass after cellulose and lignin. An important source of hemicelluloses is agave bagasse, it contains 19 % of hemicelluloses. The agave bagasse is an organic waste of tequila industry in Mexico, annually 3.824 x105 tons are generated, which has an important impact on the environment. Based on this, agave bagasse is considered a good source to obtain hemicelluloses. The xylan-type hemicelluloses possess numerous inherent advantages such as biocompatibility, biodegradability, non-toxicity and abundance. On the other hand, when the organic biopolymers are combined with inorganic materials is obtained a new materials called hybrid. The hybrid material offers advantages over traditional materials due to the combination of unique physical properties of inorganic materials with the processability and flexibility of organic compounds. In the present work, hybrid hydrogels were synthesized and characterized. Agave xylans were functionalized with trimethoxysilylpropylmethacrylate (TMSPMA) and crosslinked with n-vinylcaprolactam (NVCL), in order to obtain a material able to respond to temperature changes, in applications such as a drug delivery system. The hybrid hydrogels presented an interconnected and porous architecture according SEM characterization. The thermogravimetric analysis confirmed the functionality of the xylan with the TMSPMA. The chemical composition of the functionalized xylan was confirmed by infrared FTIR and nuclear magnetic resonance (NMR) spectroscopy. The maximum swelling and the critical solution temperature (LCST) of the materials depended on the amount of NVCL.