Efficient one-step production of astaxanthin by the microalga Haematococcus pluvialis in continuous culture.
摘要：
The performance of Haematococcus pluvialis in continuous photoautotrophic culture has been analyzed, especially from the viewpoint of astaxanthin production. To this end, chemostat cultures of Haematococcus pluvialis were carried out at constant light irradiance, 1,220 microE/m2.s, and dilution rate, 0.9/d, but varying the nitrate concentration in the feed medium reaching the reactor, from 1.7 to 20.7 mM. Both growth and biomass composition were affected by the nitrate supply. With saturating nitrate, the biomass productivity was high, 1.2 g/L.d, but astaxanthin accumulation did not take place, the C/N ratio of the biomass being 5.7. Under moderate nitrate limitation, biomass productivity was decreased, as also did biomass concentration at steady state, whereas accumulation of astaxanthin developed and the C/N ratio of the biomass increased markedly. Astaxanthin accumulation took place in cells growing and dividing actively, and its extent was enhanced in response to the limitation in nitrate availability, with a recorded maximum for astaxanthin cellular level of 0.8% of dry biomass and of 5.6 mg/L.d for astaxanthin productivity. The viability of a significant continued generation of astaxanthin-rich H. pluvialis cells becomes thus demonstrated, as also does the continuous culture option as an alternative to current procedures for the production of astaxanthin using this microalga. The intensive variable controlling the behavior of the system has been identified as the specific nitrate input, and a mathematical model developed that links growth rate with both irradiance and specific nitrate input. Moreover, a second model for astaxanthin accumulation, also as a function of irradiance and specific nitrate input, was derived. The latter model takes into account that accumulation of astaxanthin is only partially linked to growth, being besides inhibited by excess nitrate. Simulations performed fit experimental data and emphasize the contention that astaxanthin can be efficiently produced under continuous mode by adjustment of the specific nitrate input, predicting even higher values for astaxanthin productivity. The developed models represent a powerful tool for management of such an astaxanthin-generating continuous process, and could allow the development of improved systems for the production of astaxanthin-rich Haematococcus cells.
收起
展开
DOI：
10.1002/bit.20547
被引量：
年份：
2005
ResearchGate
(全网免费下载)
钛学术
(全网免费下载)
通过 文献互助 平台发起求助，成功后即可免费获取论文全文。
求助方法1：
知识发现用户
每天可免费求助50篇
求助方法1：
关注微信公众号
每天可免费求助2篇
求助方法2：
完成求助需要支付5财富值
您目前有 1000 财富值
相似文献(769)
参考文献(0)
引证文献(15)
来源期刊
影响因子：4.391
JCR分区： 暂无
中科院分区：暂无
