Short Communication - Journal of Cancer Immunology & Therapy (2021) Volume 4, Issue 2
Investigation of Biosurfactant Qualty Generated From Fungi Using Agrowaste ( Cassava Peels, Yam Peels and Potato Peels)
Background: Biosurfactant are produced extracellularly by microorganism on cell surface or excreted
extracellularly. They are involved in the reduction of surface and interfacial tension between molecules
at the surface and interface, respectively. Thus, this study was conducted to determine and compare the
capability of biosurfactant production from immediate agrochemical wastes (yam peel, cassava peels and
sweet potato peels) using fungi isolates.
Materials and Method: The test fungi (Aspergillus niger and Fusarium oxysporum) were isolated from
yam, potato and cassava peels showing advanced rottenness. Standardized production of biosurfactants
using well researched protocol involving media and inclusion of agrochemical wastes in a fermentation
broth containing the isolated fungi was carried out.
Results and Discussion: The highest biosurfactant activity value obtained was with F. oxsporum on yam
peels with emulsification index (EI) of 94.2±0.20% on kerosene after 72 hours (EI72). While the lowest
activity of biosurfactant was observed in A. niger grown on cassava peels broth with EI72 activity of
36.36±0.53% on diesel. The trend showed that emulsification index on diesel after 24 hours (E24) with
biosurfactant from A. niger grown in yam peel broth gave the highest EI concentration (48.42±0.14%)
followed by biosurfactant from F. oxysporum cultured in yam peels (48.27±0.99%). In comparison with
kerosene emulsion formed: biosurfactant from F. oxysporum grown in yam peels showed highest EI
(94±0.10%) followed by A. niger cultured in yam peels (78.72±1.08). The EI results showed that yam peel
served as a better substrate for biosurfactant production while F. oxysporum is the better biosurfactant
producing fungi. The EI values were slightly maintained for 48hrs (EI48) and 72hrs (EI72). The result
of the oil spreading assay using engine oil revealed that biosurfactants produced by F. oxysporum grown
on sweet potato peels broth displaced more area of expired engine oil in water by forming miscelles with
oil displacement area (ODA) of 9.08±0.02cm2 followed by biosurfactant from A. niger grown in sweet
potato broth with ODA of 8.04±0.38 cm2. In terms of substrate specificity the sequence of increment in EI
was: Yam>Cassava>Sweet potato. However, considering the critical micellar level or the oil displacement
ability of the product, the sequential increment was: Sweet potato>Cassava>Yam peels.
Conclusion: The biosurfactant produced shows more cleansing ability towards kerosene than it does for
diesel. Conversely, it could be channelled toward clean-up of kerosene viz a-viz crude oil contaminated
surfaces and environment.
Author(s): Ezeonu, Chukwuma