Abstract
This paper is concerned with the effect of individual Na+, K+, Mg2+ and Ca2+ ions upon the nutrient dynamics and cell morphology during submerged fermentation of Aspergillus giganteus MTCC 8408 in a medium containing ample soluble starch, corn steep liquor and proteose peptone supply. Nutrient dynamics was elucidated using Taguchi’s DOE (design of experiment) L8 orthogonal array (OA) with carbon, nitrogen and four most influensive microelements at their assigned ratio namely; K+/Ca2+ and Mg2+/Na+. Scanning electron microscopy (SEM) was used to correlate the effect of selected factors on morphological changes and nutrient dynamics during submerged fermentation. At higher K+/Ca2+ ratio 4.78:1; the maximum growth was figured out in terms of dry weight, while the inhibition of dry weight production was observed at higher Mg2+/Na+ ratio 0.94:1 with enhanced intracellular afp production. At lower C/N ratio 27.4:1; filamentous form of growth was maintained with the hyphae being scarcely branched without bulbous cells. Membrane perturbation due to the induction of intracellular oxidative stress was noticed at higher C/N ration. Taguchi DOE resulted in afp yield per substrate utilized, Yp/s of 1.08 mg g−1 soluble starch utilized with gram dry cell weight (gdcw) of 23.9 g L−1 while afp yield per biomass utilized resulted, Yp/x of 1.12 mg afp gdcw−1 L−1 and biomass yield per substrate utilized, Yx/s of 1.195 gdcw g−1 L−1. The present study revealed an opportunity to develop a cost effective methods for cell propagation so as to yield effective inoculum levels towards mass production and formulation studies.
Highlights
Submerged cultivation of various filamentous ascomycetes is ubiquitous, widespread and used to produce broad-spectrum antimicrobial metabolite, commercially (Papagianni 2004)
This paper is concerned with the effect of individual Na?, K?, Mg2? and Ca2? ions upon the nutrient dynamics and cell morphology during submerged fermentation of Aspergillus giganteus MTCC 8408 in a medium containing ample soluble starch, corn steep liquor and proteose peptone supply
Taguchi design of experiments (DOE) resulted in afp yield per substrate utilized, Yp/s of 1.08 mg g-1 soluble starch utilized with gram dry cell weight of 23.9 g L-1 while afp yield per biomass utilized resulted, Yp/x of 1.12 mg afp gdcw-1 L-1 and biomass yield per substrate utilized, Yx/s of 1.195 gdcw g-1 L-1
Summary
Submerged cultivation of various filamentous ascomycetes is ubiquitous, widespread and used to produce broad-spectrum antimicrobial metabolite, commercially (Papagianni 2004). Nutrient source is a cognitive factor of growth and germination of filamentous fungi (Shah and Tariq 2005). For commercial cultivation of microorganism, it is imperative to have an in-depth knowledge of their nutritional requirements. The macroelements such as carbon, oxygen, hydrogen, nitrogen, potassium, magnesium, calcium and phosphorus are integral components of carbohydrates, lipids, proteins and nucleic acids and these metabolically active groups are directly/indirectly involved in hostpathogen interaction and self-defense and perpetuation mechanisms. Carbon is required as the skeletal element of all organic molecules, and molecules serving as carbon sources normally contribute both oxygen and hydrogen. Mg2? ion is widely perceived as an essential element for fungal growth and its biochemical functions (Jasper and Silver 1977) involved in a major way through transducing and the control of cell division in many filamentous
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
