Journal
JOURNAL OF MICROENCAPSULATION
Volume 28, Issue 7, Pages 628-638Publisher
INFORMA HEALTHCARE
DOI: 10.3109/02652048.2011.599443
Keywords
2-phenylethanol; Saccharomyces cerevisiae; in situ product removal; polymethylmethacrylate microspheres; single-step swelling
Funding
- Russell Berrie Nanotechnology Institute at the Technion
- Minerva Grant (Microscale and Nanoscale Particles and Films)
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The commercial production of the fragrance compound 2-phenylethanol (2-PE) from phenylalanine by yeast is limited by the accumulation of the toxic product, and therefore, in situ product removal techniques are required. We describe the use of hydrophobic polymethylmethacrylate (PMMA) microspheres of narrow size distribution of 1.53 +/- 0.10 mu m diameter for continuous removal of 2-PE from the fermentation medium by a mechanism of swelling. In shake flask experiments with conditions simulating 2-PE stress, a 10-fold increase in productivity was measured for systems containing 410% (w/v) microspheres. A 1 L fed-batch fermentation with 8% (w/v) of PMMA microspheres resulted in a total 2-PE concentration of 7.05 g/L, from which 5.40 g/L was incorporated inside the resin, implying 76% encapsulation. This ratio of 0.07 g/g of product per resin is among the highest reported to date. Scanning electron microscopy revealed a concomitant increase in sphere diameter confirming that swelling occurred.
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