By: Prakash Vaithyanathan
Science Teacher and Innovator, 50, L. B. Road, Adyar, Chennai, Tamil Nadu, India.
In one of the earliest attempts, nanoyeast (Saccharomyces cerevisiae) particles were supported on an exotic and novel support[CD1]Ā , namely, silica gel. The presence of nanoparticles of yeast with size as small as 161 nm was reported. Nanoyeast buds of very small size namely 41 nm were also observed in the HR SEM. Analogous to the nanoparticles in the chemical world, size reduction of microorganisms with commercial relevance like, yeast, will have groundbreaking implications in the realm of fermentation, leading to biofuels, biochemicals and biopharmaceuticals production. A mild sonication (40 kHz) driven impregnation technique was used for the preparation of the nanobiocatalyst. The presence of the nanobuds on yeast nanoparticles supported on silica gel were proved unambiguously using SEM with EDXA analysis. From the SEM, nanoyeast particles with varying sizes (40ā1000 nm) well dispersed on the silica gel were observed. This is the worldās first report on the production of nanoyeast on such an inexpensive and widely used material, namely, silica gel. The potential of the biocatalyst is demonstrated to produce bioethanol from glucose (10 wt. %). 1H NMR was used for the qualitative and quantitative analysis of the yeast. In a homemade continuous flow fixed bed flow bioreactor packed with the biocatalyst (nanoyeast/silica gel) glucose was converted to bioethanol. On the 2nd and 3rd day of the fermentation, bioethanol concentration of 0.075 wt. % and 0.12 wt. % were obtained from the glucose. As the reactor is yet to attain the criticality, it is surmised that the yields close to the theoretical values (namely 5.1 wt. % bioethanol from glucose) could be realized. This has been a first successful attempt to demonstrate the sustainability, proliferation and fermentative activity of the nanoyeast (Saccharomyces cerevisiae) supported on silica gel. Thus, a breakthrough in the realm of modulating the size of the microorganisms, in general, and fugal strain (yeast) in particular, to the nanodimensions has been achieved. Moreover, the current process offers a logical explanation to the natural phenomena of fermentation of leftover foods on sea sands via the action of the fungal microorganisms on the sea sands.
Citation:
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