Optimization of enzymatic hydrolysis of cellulosic fraction obtained from stranded driftwood feedstocks for lipid production by
Solicoccozyma terricola.
ACTA ACUST UNITED AC 2019;
24:e00367. [PMID:
31453116 PMCID:
PMC6704348 DOI:
10.1016/j.btre.2019.e00367]
[Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2019] [Revised: 07/04/2019] [Accepted: 08/06/2019] [Indexed: 12/01/2022]
Abstract
Stranded driftwood feedstocks (SD) were steam exploded and hydrolyzed.
The enzymatic hydrolysis was optimized using a multivariate approach (RSM).
The conversion of carbohydrates into lipids by S. terricola was high (YL = 25.26%).
The fatty acid profile achieved was similar to that reported for palm oil.
SD feedstocks resulted a cheap C-source for biofuels and biochemicals production.
Stranded driftwood feedstocks may represent, after pretreatment with steam explosion and enzymatic hydrolysis, a cheap C-source for producing biochemicals and biofuels using oleaginous yeasts. The hydrolysis was optimized using a response surface methodology (RSM). The solid loading (SL) and the dosage of enzyme cocktail (ED) were variated following a central composite design (CCD) aimed at optimizing the conversion of carbohydrates into lipids (YL) by the yeast Solicoccozyma terricola DBVPG 5870.
A second-order polynomial equation was computed for describing the effect of ED and SL on YL.
The best combination (ED = 3.10%; SL = 22.07%) for releasing the optimal concentration of carbohydrates which gave the highest predicted YL (27.32%) was then validated by a new hydrolysis. The resulting value of YL (25.26%) was close to the theoretical maximum value.
Interestingly, fatty acid profile achieved under the optimized conditions was similar to that reported for palm oil.
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