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ajmalicine/catharanthus
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Ajmalicine, Serpentine, and Catharanthine Accumulation in Catharanthus roseus Bioreactor Cultures.
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A 141, stirred-tank bioreactor was used to investigate the effect of 7% glucose solutions on CATHARANTHUS ROSEUS suspension cultures. Measurement of oxygen uptake rate indicated that alkaloid accumulation occurred primarily during a 20-day transition period between growth-oriented metabolism and
Enhancement of ajmalicine production in Catharanthus roseus cell cultures with methyl jasmonate is dependent on timing and dosage of elicitation.
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The optimum growth stage for enhancing ajmalicine production in Catharanthus roseus cultures with methyl jasmonate (MJ) was after 6 d growth. MJ added at 10 or 100 microm on day 6 gave a maximum ajmalicine production of 10.2 mg l(-1), a 300% increase over that of non-elicited cultures.
New method to enhance ajmalicine production in Catharanthus roseus cell cultures based on the use of cyclodextrins.
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The joint use of cyclodextrins and methyljasmonate, when accompanied by a short exposure to UV, enhanced extracellular ajmalicine accumulation to 1040 ± 26.6 mg/l in suspension cultured cells of Catharanthus roseus. The success of this strategy is due to the use of cyclodextrins, which not only
The negligible role of carbon dioxide and ethylene in ajmalicine production by Catharanthus roseus cell suspensions.
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Removal of gaseous metabolites in an aerated fermenter affects ajmalicine production by Catharanthus roseus negatively. Therefore, the role of CO2 and ethylene in ajmalicine production by C. roseus was investigated in 3 l fermenters (working volume 1.8 l) with recirculation of a large part of the
Large-scale cultivation of Catharanthus roseus cells: production of ajmalicine in a 20-l airlift bioreactor.
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Bioreactor systems have been developed for the production of ajmalicine, an alkaloid used in the treatment of hypertension. Cell cultures of Catharanthus roseus produced higher levels of ajmalicine (323 micrograms g-1 dry weight) in a production medium enriched with tryptophan. The cell cultures
Scaleup of ajmalicine production by plant cell cultures of Catharanthus roseus.
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The effect of scaleup on he production of ajmalicine by a Catharanthus roseus cell suspension culture in a selected induction medium were studied. In preliminary experiments it was observed that the culture turned brown and the production was inhibited upon transfer from a shake flask to a stirred
Relation between dissolved oxygen concentration and ajmalicine production rate in high-density cultures of Catharanthus roseus.
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The relation between dissolved oxygen (DO) and the ajmalicine production rate of Catharanthus roseus was investigated in 15-L tank reactors at constant stirrer speed and gas flow rate. Below a DO concentration of 29% of air saturation the ajmalicine production rate was less than 0.06 micromol/g/d.
Induction of ajmalicine formation and related enzyme activities in Catharanthus roseus cells: effect of inoculum density.
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In Catharanthus roseus cell cultures the time courses of four enzyme activities, tryptophan decarboxylase (TDC), strictosidine synthase (SSS), geraniol-10-hydroxylase (G10H) and anthranilate synthase (AS), and alkaloid accumulation were compared under two different culture conditions (low-inoculum
Studies on production of ajmalicine in shake flasks by multiple shoot cultures of Catharanthus roseus.
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The effects of different concentrations of indole-3-acetic acid (IAA) and benzyladenine (BA) on production of ajmalicine by multiple shoot cultures of Catharanthus roseus (C. roseus) were studied. By supplementing Murashige and Skoog's (MS) medium with a high concentration of IAA (11.42 microM) and
Development of a novel system for producing ajmalicine and serpentine using direct culture of leaves in Catharanthus roseus intact plant.
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Due to problems of production instability, the production of plant secondary metabolites using dedifferentiated cells (callus) is not always feasible on an industrial scale. To propose a new methodology, which does not use dedifferentiated cells, a novel system for producing useful secondary
Effects of oxygen and nutrients limitation on ajmalicine production and related enzyme activities in high density cultures of Catharanthus roseus.
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Oxygen and nutrient limitation was investigated in order to identify the origin of a lower specific ajmalicine production in Catharanthus roseus cultures at high cell densities in an induction medium. The effect of oxygen limitation was explored by comparing two identically aerated and agitated high
Two-stage batch process for the production of ajmalicine by Catharanthus roseus: The link between growth and production stage.
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The link between the growth stage and the production stage in a two-stage batch process was investigated using (filtered) inocula from different periods of the stationary phase of the growth cycle. In the production stage, ajmalicine production by Catharanthus roseus in a 3-L stirred tank reactor
The effect of ajmalicine spiking and resin addition timing on the production of indole alkaloids from Catharanthus roseus cell cultures.
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The potential for the feedback inhibition of indole alkaloid synthesis was investigated by spiking suspension cultures of Catharanthus roseus with 0, 9, or 18 mg/L ajmalicine on day 0. The production of ajmalicine, catharanthine, and serpentine were inhibited in a dose-dependent manner. The
The role of glucose in ajmalicine production by catharanthus roseus cell cultures.
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The role of glucose in ajmalicine production by Catharanthus roseus was investigated in the second stage of a two-stage batch process. Activities of tryptophan decar-boxylate (TDC) and anthranilate synthase (AS), two enzymes In the pathway leading to ajmalicine, were higher after induction with 40
Pseudomonas fluorescens enhances biomass yield and ajmalicine production in Catharanthus roseus under water deficit stress.
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The effect of plant growth promoting rhizobacteria (PGPR) like Pseudomonas fluorescens on growth parameters and the production of ajmalicine were investigated in Catharanthus roseus under drought stress. The plants under pot culture were subjected to 10, 15 and 20 days interval drought (DID) stress
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