Effects Of Different Modification Methods On The Structure And Properties Of Bacterial Cellulose

Bacterial cellulose(BC)is considered to be the best choice for model compounds for studying cellulose due to its simple structure.However,it is also because of the unity of its structure that the application of bacterial cellulose has limitations.This work aims to study the modification of cellulose and prepare functional bacterial cellulose.The article starts with simple bacterial cellulose hydrolysis,explores the bacterial cellulose nanocrystals obtained by enzymatic hydrolysis,sulfuric acid hydrolysis,microwave-assisted secondary hydrolysis,and phosphoric acid primary hydrolysis.Observe the effect of different hydrolysis methods on cellulose nanocrystals,and Further explore the impact on its stable emulsion.Through infrared spectroscopy,X-ray diffraction,laser particle size analyzer,transmission electron microscope,laser confocal microscope,optical microscope,and scanning electron microscope for analysis and comparison,it was found that there are certain crystal forms and structures of bacterial cellulose nanocrystals obtained by different hydrolysis methods The difference has a certain effect on the physical and chemical properties of the nanocrystals.The main work of this paper is on bio-modified bacterial cellulose.First,by adding sodium alginate polysaccharides with different molecular weights to the medium,instead of the traditional carbon source,the synthetic bacterial cellulose can be bio-modified after a series of characterizations.Bacterial cellulose has better amphiphilic properties,which has a positive impact on the application of emulsion preparation.On the basis of the above work,the sodium alginate grafted with aminocoumarin was added to the bacterial cellulose medium instead of sucrose to conduct experiments to obtain bacterial cellulose with fluorescent response.The obtained bacterial cellulose membrane has fluorescence responsiveness,which provides empirical support for the subsequent biological modification of bacterial cellulose.