TY - JOUR
T1 - Alginate molecular mass produced by Azotobacter vinelandii in response to changes of the O2 transfer rate in chemostat cultures
AU - Díaz-Barrera, A.
AU - Silva, P.
AU - Ávalos, R.
AU - Acevedo, F.
PY - 2009/6
Y1 - 2009/6
N2 - Alginate production by Azotobacter vinelandii growing in chemostat cultures was evaluated under different O2 transfer rates (OTR). As a result of modifying the culture's agitation rate from 300 to 500 rpm, the OTR increased from 9 to 15.1 mmol l-1 h-1 and a slight variation in the alginate production (1.7-2.2 g l-1) was observed. At a constant growth rate (0.1 h-1), the mean molecular mass of the alginate was strongly influenced by changes in the OTR, varying from 860 to 1,690 kDa. These results support a possible relationship between alginate polymerization- depolymerization process and the O2 uptake rate.
AB - Alginate production by Azotobacter vinelandii growing in chemostat cultures was evaluated under different O2 transfer rates (OTR). As a result of modifying the culture's agitation rate from 300 to 500 rpm, the OTR increased from 9 to 15.1 mmol l-1 h-1 and a slight variation in the alginate production (1.7-2.2 g l-1) was observed. At a constant growth rate (0.1 h-1), the mean molecular mass of the alginate was strongly influenced by changes in the OTR, varying from 860 to 1,690 kDa. These results support a possible relationship between alginate polymerization- depolymerization process and the O2 uptake rate.
KW - Alginate
KW - Chemostat
KW - Molecular mass
KW - Oxygen transfer rate
UR - http://www.scopus.com/inward/record.url?scp=67349225704&partnerID=8YFLogxK
U2 - 10.1007/s10529-009-9949-9
DO - 10.1007/s10529-009-9949-9
M3 - Article
C2 - 19229480
AN - SCOPUS:67349225704
SN - 0141-5492
VL - 31
SP - 825
EP - 829
JO - Biotechnology Letters
JF - Biotechnology Letters
IS - 6
ER -