Lovastatin biosynthesis depends on the carbon-nitrogen proportion: Model development and controller design

James Gomes, Juhi Pahwa, Sanjay Kumar, Bhaskar Sen Gupta

    Research output: Contribution to journalArticle

    Abstract

    Lovastatin biosynthesis depends on the relative concentrations of dissolved oxygen and the carbon and nitrogen resources. An elucidation of the underlying relationship would facilitate the derivation of a controller for the improvement of lovastatin yield in bioprocesses. To achieve this goal, batch submerged cultivation experiments of lovastatin production by Aspergillus flavipus BICC 5174, using both lactose and glucose as carbon sources, were performed in a 7 liter bioreactor and the data used to determine how the relative concentrations of lactose, glucose, glutamine and oxygen affected lovastatin yield. A model was developed based on these results and its prediction was validated using an independent set of batch data obtained from a 15-liter bioreactor using five statistical measures, including the Willmott index of agreement. A nonlinear controller was designed considering that dissolved oxygen and lactose concentrations could be measured online, and using the lactose feed rate and airflow rate as process inputs. Simulation experiments were performed to demonstrate that a practical implementation of the nonlinear controller would result in satisfactory outcomes. This is the first model that correlates lovastatin biosynthesis to carbon-nitrogen proportion and possesses a structure suitable for implementing a strategy for controlling lovastatin production.
    Original languageEnglish
    Pages (from-to)201-210
    Number of pages10
    JournalEngineering in Life Sciences
    Volume14
    Issue number2
    DOIs
    Publication statusPublished - 3 Mar 2014

    Fingerprint

    bioreactor
    nitrogen
    dissolved oxygen
    carbon
    glucose
    airflow
    experiment
    oxygen
    resource
    prediction
    simulation
    biosynthesis
    development model
    rate
    index

    Keywords

    • Lovastatin model;glucose:glutamate ratio;submerged fermentation;Aspergillus flavipus;nonlinear control

    Cite this

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    abstract = "Lovastatin biosynthesis depends on the relative concentrations of dissolved oxygen and the carbon and nitrogen resources. An elucidation of the underlying relationship would facilitate the derivation of a controller for the improvement of lovastatin yield in bioprocesses. To achieve this goal, batch submerged cultivation experiments of lovastatin production by Aspergillus flavipus BICC 5174, using both lactose and glucose as carbon sources, were performed in a 7 liter bioreactor and the data used to determine how the relative concentrations of lactose, glucose, glutamine and oxygen affected lovastatin yield. A model was developed based on these results and its prediction was validated using an independent set of batch data obtained from a 15-liter bioreactor using five statistical measures, including the Willmott index of agreement. A nonlinear controller was designed considering that dissolved oxygen and lactose concentrations could be measured online, and using the lactose feed rate and airflow rate as process inputs. Simulation experiments were performed to demonstrate that a practical implementation of the nonlinear controller would result in satisfactory outcomes. This is the first model that correlates lovastatin biosynthesis to carbon-nitrogen proportion and possesses a structure suitable for implementing a strategy for controlling lovastatin production.",
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    Lovastatin biosynthesis depends on the carbon-nitrogen proportion: Model development and controller design. / Gomes, James; Pahwa, Juhi; Kumar, Sanjay; Sen Gupta, Bhaskar.

    In: Engineering in Life Sciences, Vol. 14, No. 2, 03.03.2014, p. 201-210.

    Research output: Contribution to journalArticle

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