TY - JOUR
T1 - A strategy for the synthesis of low-molecular-weight welan gum by eliminating capsule form of Sphingomonas strains
AU - Zhao, Ming
AU - Zhang, Hao
AU - Xu, Xiaoqi
AU - Li, Sha
AU - Xu, Hong
N1 - Publisher Copyright:
© 2021
PY - 2021/5/1
Y1 - 2021/5/1
N2 - Welan gum is widely used in food, concrete additives, and oil recovery. Here we changed the capsule form of Sphingomonas strains by knocked out the sortase gene (srtW). The obtained welan gum was mainly composed of mannose, glucose, rhamnose, and glucuronic acid at a molar ratio of 4.0:5.8:1.6:1, respectively. Meanwhile, the molecular weight of welan gum decreased sharply (about 68 kDa). Moreover, the low molecular weight (LMW) welan gum was characterized by FT-IR and NMR spectroscopy. The rheological results revealed that the LMW welan gum solution is a pseudoplastic fluid with a lower apparent viscosity. Furthermore, the oscillation test illustrated stable dynamic viscoelasticity within the temperature range of 5–68 °C and frequency range of 0.01–15 rad/s. To the best of our knowledge, this is the first report of LMW welan gum production and characterization. These results provide references for LMW welan gum applications, and likely applicable for other biopolymers production.
AB - Welan gum is widely used in food, concrete additives, and oil recovery. Here we changed the capsule form of Sphingomonas strains by knocked out the sortase gene (srtW). The obtained welan gum was mainly composed of mannose, glucose, rhamnose, and glucuronic acid at a molar ratio of 4.0:5.8:1.6:1, respectively. Meanwhile, the molecular weight of welan gum decreased sharply (about 68 kDa). Moreover, the low molecular weight (LMW) welan gum was characterized by FT-IR and NMR spectroscopy. The rheological results revealed that the LMW welan gum solution is a pseudoplastic fluid with a lower apparent viscosity. Furthermore, the oscillation test illustrated stable dynamic viscoelasticity within the temperature range of 5–68 °C and frequency range of 0.01–15 rad/s. To the best of our knowledge, this is the first report of LMW welan gum production and characterization. These results provide references for LMW welan gum applications, and likely applicable for other biopolymers production.
KW - Characterization
KW - Low molecular weight
KW - Welan gum
UR - http://www.scopus.com/inward/record.url?scp=85101350499&partnerID=8YFLogxK
U2 - 10.1016/j.ijbiomac.2021.02.157
DO - 10.1016/j.ijbiomac.2021.02.157
M3 - 文章
C2 - 33636257
AN - SCOPUS:85101350499
SN - 0141-8130
VL - 178
SP - 11
EP - 18
JO - International Journal of Biological Macromolecules
JF - International Journal of Biological Macromolecules
ER -