There's a lot of information on biosurfactant-producing yeasts. the literature is rich. You are just a click away on Google search engine.

Thank you Mr @Maurice Ekspenyong. However, I need some techniques to be clear in my research.

Best regards,

Rifky Alfian

Hi, yes its good to know more about what to do and new field to explore. You however need to do more of the studies online, read many papers and reviews on the subject matter and then ask specific questions on grey areas that seem not to clear to you.

I suggest these writeup for your perusal for understanding basics of biosurfactant-producing yeasts

General knowledge on biosurfactants

Article Biosurfactants-Types, Sources and Applications

Article Potential Commercial Applications of Microbial Surfactants

Article Biosurfactants from Yeasts: Characteristics, Production and ...

Research Methods such as Parafilm M test, Drop collapsing assay, Oil displacement test , Surface tension measurement etc

Article Biosurfactant-producing yeasts widely inhabit various vegeta...

https://scialert.net/fulltext/?doi=biotech.2014.106.111

http://www.thaiscience.info/journals/Article/WJST/10827858.pdf

Thank you very much Mr. Asemoloye for your giving me some informations and papers

Best regards,

Achmad Rifky Alfian

Hello, your question is a bit unspecific, but I would happily recommend these works. Greetings.

Zhu Z, Zhang J., Wu Y., Ran W. Shen Q. (2013) Comparative study on the proerties of lipopeptide products and expression of biosynteteci genes from Bacillus amyloliquefaciens XZ-173 in liquid fermentation and solid-state fermentation. World J. Microbiol Biotechnol. DOI 10.1007/s11274-013-1375-4

Das K, Mukherjee AK (2007) Comparison of lipopeptide biosurfactants

production by Bacillus subtilis strains in submerged and

solid state fermentation systems using a cheap carbon source:

some industrial applications of biosurfactants. Process Biochem

42:1191–1199

Das M, Das SK, Mukherjee RK (1998) Surface active properties of

the culture filtrates of a Micrococcus species grown on n-alkenes

and sugars. Bioresour Technol 63:231–235