Improvement of Thermo-Stability and Solvent Tolerant Property of Streptomyces sp. A3301 Lipase by Immobilization Techniques with Application in Poly (lactic acid) Polymerization by Using Biological Process
DOI:
https://doi.org/10.48048/tis.2024.8377Keywords:
Poly (lactic acid) or (PLA), Lipase, Enzyme immobilization, Sponge, Adsorption method, Thermo-solvent tolerant lipase, PLA -polymerization, Biological processAbstract
The thermo-solvent-tolerant lipase-producing actinomycete, Streptomyces sp. A3301, was utilized as a biocatalyst for poly (lactic acid) or PLA polymerization. The study aimed to optimize lipase immobilization conditions, characterize the immobilized lipase and apply it for PLA polymerization. The results showed using a sponge as the immobilizing matrix was the most effective method, achieving a maximum activity of 277 U/g of sponge. The optimal sponge size was determined to be 0.125 cm³ and pre-soaking the sponge in 0.1 M phosphate buffer at pH 7.0 for 24 h before use proved advantageous. Immobilization significantly enhanced the thermo-stability of the enzyme, with a relative activity ranging from 140 to 190 % within the temperature range of 30 to 60 °C. In contrast, the crude lipase exhibited thermo-stability only within the 30 - 50 °C range. The immobilized lipase demonstrated stability under PLA polymerization conditions, which involved a reaction mixture containing toluene and lactic acid and performed at 60 °C for 8 h. The immobilized lipase maintained its activity under this condition for 5 h, retaining a relative activity of 230 %, which was 1.2 times higher than the activity of the crude lipase. When the immobilized lipase was used in PLA polymerization, the resulting PLA product exhibited a molecular weight of 5,333 ± 0.02 Da, and the degree of polymerization was approximately 72. These findings underscore the potential of the immobilization technique to enhance lipase activity for PLA polymerization.
HIGHLIGHTS
- PLA polymerization via a biological process is demonstrated.
- PLA can be polymerized by enzyme lipase produced by Streptomyces sp. A3301.
- Improving PLA polymerization with enzyme immobilization techniques.
- Sponge is the best immobilizer for PLA polymerization.
- PLA can be synthesized under mild conditions.
GRAPHICAL ABSTRACT
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