Production of polyhydroxyalkanoates from inexpensive extruded rice bran and starch by Haloferax mediterranei.
Low-cost raw materials can be used to reduce significantly the production cost of polyhydroxyalkanoates (PHA). In this study, extruded rice bran (ERB) and extruded cornstarch (ECS) were used as carbon sources to produce PHA by an archaea, Haloferax mediterranei, which cannot use native rice bran or cornstarch as a carbon source. By employing pH-stat control strategy to maintain pH at 6.9-7.1 in a 5-liter jar fermentor using ERB:ECS (1:8 g/g) as the major carbon source, we obtained a cell concentration of 140 g/L, PHA concentration of 77.8 g/L and PHA content of 55.6 wt.% in a repeated fed-batch fermentation. In contrast, when ECS was used as the major carbon source, we obtained 62.6 g/L cell concentration, 24.2 g/L PHA concentration and 38.7 wt.% PHA content. Under a hyper-saline condition and with no nitrogen-limitation restriction, the repeated fed-batch process can be sustained a long time for the mass production of PHA.
Huang
Ting-Yen
TY
Department of Bioengineering, Tatung University, Taipei, Taiwan.
Duan
Kow-Jen
KJ
Huang
Shih-Yow
SY
Chen
C Will
CW
D003470:Culture Media; D005285:Fermentation; D019623:Haloferax mediterranei / Q000254:growth & development* / Q000378:metabolism; D007218:Industrial Microbiology; D012275:Oryza; D011108:Polymers / Q000378:metabolism*; D012965:Sodium Chloride; D013213:Starch
D003470:Culture Media; D011108:Polymers; D012965:Sodium Chloride; D013213:Starch