Journal
INDUSTRIAL CROPS AND PRODUCTS
Volume 122, Issue -, Pages 637-646Publisher
ELSEVIER
DOI: 10.1016/j.indcrop.2018.06.048
Keywords
Bacterial cellulose; Sugarcane molasses; Alternative culture medium; Smoother and flexible BC membranes; Cheaper BC production
Categories
Funding
- FAPESP [13/04948-9, 11/51725-0]
- Brazilian agency CNPq
- Brazilian agency CAPES
- Spanish Ministry of Economy and Competitiveness
- European Union [MAT2015-66149-P]
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Komagataeibacter rhaeticus, a bacterium isolated from Kombucha tea, was used to produce bacterial cellulose (BC) through its cultivation in a static sugarcane molasses (SCM) supplemented-culture medium (totally or partially), as an alternative carbon source. BC membranes were characterized by different physicochemical analysis using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), field emission gun scanning electron microscopy (FEG-SEM), thermogravimetry analysis (TGA) and PeakForce quantitative nano mechanics atomic force microscopy (PeakForce (QNM-AFM)). FTIR, XRD and TGA results suggest great similarity among all membranes produced by distinct culture media. Although the glucose (F1) and SCM (F6) media presented the lowest BC yield, all SCM-supplemented culture media (from F2 to F5) showed BC yield values similar to the HS culture medium (F0). FEG-SEM analysis showed that as higher SCM concentrations on culture media higher dense nanofibers network could be prepared. Quantitative nanomechanical results obtained by AFM technique corroborate FEG-SEM analysis besides show smoother and more flexible BC membranes as a function of the increasing of the SCM concentrations. The modification of the carbon source of the culture medium with an important by-product of Brazilian agroindustry appears as a viable alternative to reduce cost of BC production (of up to 20.06%) besides increase the possibilities of industrial scale BC preparation.
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