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2.3 Biosynthesis of BS by Yeasts and Molds
Yeasts and molds produce BS, mainly glycolipids, as SL and mannosylerythritol‐lipids. Table 2.3 shows the most important genera of BS producers, particularly, Candida, Pseudozyma, and Starmerella (ex Candida). Compared to bacteria, yeasts and molds have been less explored as a source of BS, with the exception of SL for oil and cosmetic applications. Candida genus are capable to synthetize both types (SL and MEL) of glycolipids [18]. Starmerella bombicola is the most important yeast in SL production and mold Ustilago maydis in other glycolipids. As bacteria, yeasts and molds have a highly regulated metabolic pathway for the BS synthesis, since these compounds are secondary metabolites. The carbon source, hydrophobic substrate, and nitrogen limitation are prevailing factors in SL and mannosylerythritol lipids biosynthesis, while for cellobiose lipids nitrogen source is also important [18].
Table 2.3 Yeasts and molds as biosurfactants producers.
Biosurfactant | Microorganism | Carbon source |
---|---|---|
Mannosylerythritol lipids | Pseudozyma antarctica | Glycerol [63] |
Pseudozyma rugulosa | Soybean oil [64] | |
Pseudozyma aphidis | Soybean oil, glucose [64] | |
Pseudozyma tsukubaensis | Olive oil, arabitol [65] | |
Pseudozyma hubiensis | Soybean oil [66] | |
Pseudozyma shanxiensis | Soybean oil [66] | |
Pseudozyma crassa | Glucose and oleic acid [67] | |
Cybersan | Cyberlindnera saturnus | Glucose [68] |
Sophorolipids | Candida floricola | Glucose and olive oil [69] |
Candida batistae | Glucose and olive oil [70] | |
Candida apicola | Glucose and olive oil [71] | |
Candida stellata | Glucose and olive oil [71] | |
Candida riodocensis | Glucose and olive oil [71] | |
Candida kuoi | Glucose and olive oil [72] | |
Meyerozyma guilliermondii | Olive oil [73] | |
Starmerella bombicola | Biomass hydrolysate [74], palm oil [75], food waste [76] | |
Wickerhamiella domercqiae | Glucose, repeseed oil [77] | |
Lachancea thermotolerans | Canola oil [78] | |
Glycolipids | Wickerhamomyces anomalus | Glucose and olive oil [79] |
Cellobiose lipids | Cryptococcus humicola | Glucose [80] |
Glycoprotein | Curvularia lunata |