Acetobacter xylinum 유래 Biocellulose의 물성기능 특성

초록

Powders of Biocellulose from Acetobacter xylinum was prepared by hot air drying(AD) or freeze drying (FD). The crystalline/surface structures of their powders (100mesh) were examined, and several physical functionalities including, water holding capacity(WHC), oil holding capacity(OHC), emulsion/foam properties and viscosity properties were also investigated. WHC of air dried and freeze dried biocelluloses were 8.24±0.15 and 9.26±0.10g water retained/g solid, respectively, whileas OHC for soybean or rice bran oil were 7.14~7.46 and 7.20~7.54g oil retained/g solid, respectively. These values of WHC and OHC were 1.5 times higher than that of commercial α-cellulose. Changes of temperature and pH showed a small effect on WHC and OHC. Emulsion capacity of 2%(w/v) biocellulose was about 40% level of 0.5%(w/v) xanthan gum but emulsion stability after incubation of 24 hours showed about 1.3 times improvement. Also, biocellulose(~2%, w/v) alone had no foam capacity but especially, biocellulose FD improved the foam stability of protein solution(1% albumin+0.5% CaCl2) by factor of 285%. Biocellulose alone was not dispersed in water, but very good dispersity was obtained by addition of CMC(carboxyl methyl cellulose), and 1.5%(w/v) biocellulose dispersion with 0.3% CMC exhibited the viscosity properties for new potential usage as an excellent thickening agent.

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