In situ modification of bacterial cellulose network structure by adding interfering substances during fermentation.
In an attempt to obtain bacterial cellulose (BC) with improved rehydration ability, Tween 80, urea, fluorescent brightener, hydroxypropylmethyl cellulose (HPMC) and carboxymethyl cellulose (CMC) were introduced into BC fermentation medium. Measurements of the mechanical strength of the resulting BCs (TBC, UBC, FBC, HBC and CBC) showed a decline except for UBC. SEM images showed that, although the cellulose bundle widths of FBC, HBC and CBC increase, the cellulose network void in FBC grew, while those in HBC and CBC shrank. X-ray diffraction and FT-IR analysis demonstrated that the addition of HPMC and CMC reduced the degree of crystallinity in their corresponding MBCs from 70.54% to 52.23% and 45.38%, respectively. HBC and CBC also exhibited the highest rehydration ability among all MBCs as well as the lowest crystallinity. The in situ modification with HPMC and CMC during fermentation can effectively improve rehydration ability of BC by altering its network structure.
Huang
Huang-Chan
HC
Department of Food Science, National Ilan University, 1 Sec. 1, Shen Nung Rd., Ilan City, Taiwan, ROC.
Chen
Li-Chen
LC
Lin
Shih-Bin
SB
Hsu
Chieh-Ping
CP
Chen
Hui-Huang
HH
D002482:Cellulose / Q000008:administration & dosage* / Q000378:metabolism*; D005109:Extracellular Matrix / Q000187:drug effects / Q000502:physiology*; D005285:Fermentation; D041822:Gluconacetobacter xylinus / Q000187:drug effects / Q000378:metabolism*; D015398:Signal Transduction / Q000187:drug effects / Q000502:physiology*
D002482:Cellulose