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Palumpitag W.,Chulalongkorn University | Prasitchoke P.,PTT Chemical Public Company Ltd | Goto M.,Kumamoto University | Shotipruk A.,Chulalongkorn University
Separation Science and Technology | Year: 2011

Extraction of lutein fatty acid esters from marigold flower using supercritical carbon dioxide (SC-CO 2) with cosolvent was investigated. Without the cosolvent, the total xanthophylls yield increased with increasing temperature and pressure of SC-CO 2, and the optimal condition was found to be at 60°C and 40 MPa. At this condition, the highest total xanthophylls percent recovery was 74.4±0.9%. Palm oil was found to be a more efficient cosolvent than soybean oil, olive oil, and ethanol, resulting in a 16% increase in the total xanthophylls recovery to 87.2±4.4% when 10% (w/w) of palm oil was used. Furthermore, saponification of the oleoresin for 3 h at 75°C with 40% w/v KOH solution at the oleoresin to solution ratio of 1 g to 2ml was found to suitably convert lutein fatty acid esters into free lutein. © Taylor & Francis Group, LLC.

Boonsongsawat T.,Chulalongkorn University | Shotipruk A.,Chulalongkorn University | Tantayakom V.,PTT Chemical Public Company Ltd | Prasitchoke P.,PTT Chemical Public Company Ltd | And 3 more authors.
Separation Science and Technology | Year: 2010

This study examined the use of ethyl acetate and its mixture with ethanol as cosolvent for the extraction of biologically derived 1,3-propanediol (1,3-PDO) from a fermentional process. Experimental results on extraction of the fermentation model mixture revealed that ethyl acetate was a suitable solvent, having the distribution coefficient of 1,3-PDO of 0.22 at 303.15 K. The temperature (303.15 to 323.15 K) was found not to have a significant effect on the distribution coefficient. On the other hand, the addition of glycerol into the feed aqueous stream (at the concentrations of 4, 8, 12 g/L) was found to increase the distribution coefficient of 1,3-PDOs, however, the compound selectivity decreased. When ethanol was used as a cosolvent at the volume ratio of ethyl acetate to ethanol of 90:10, the distribution coefficient increased from 0.22 to 0.31 at 303.15 K. This decreased the number of theoretical stages (NTS) required to achieve 90% recovery of 1,3-PDO from the aqueous phase from 3 to 2 stages at the solvent to feed (S/F) ratio of 9. In addition, the extraction results with actual fermentation broth at 303.15 K indicated that the use of ethanol cosolvent could improve the distribution coefficient of 1,3 PDO from 0.14 to 0.20. © Taylor & Francis Group, LLC.

Thongchul N.,Chulalongkorn University | Noitang S.,Chulalongkorn University | Sooksai S.,Chulalongkorn University | Petsom A.,Chulalongkorn University | And 2 more authors.
10AIChE - 2010 AIChE Annual Meeting, Conference Proceedings | Year: 2010

Glycerol is now considered as the major byproduct from biodiesel manufacture. Nowadays, the application of glycerol is very limited. In the near future, biodiesel production may suffer from glycerol surplus if there is no sustainable solution for glycerol utilization. In a large commercial biodiesel plant, crude glycerol often enters purification process which eventually yields highly purified glycerol for applications in pharmaceutical and cosmetic industries. Nonetheless, a large amount of purified glycerol is still a surplus for pharmaceutical and cosmetic industries. Using the biotechnology technique to convert glycerol to the value-added product has been brought into attraction. It is well known that Hansenula polymorpha consume glycerol for both carbon and energy sources. Under aerobic condition, glycerol is usually converted by glycerol kinase into glycerol-3-phosphate (G3P), which is then oxidized to dihydroxyacetone phosphate (DHAP) by a membrane-bound G3P dehydrogenase before entering a central metabolic pathway. In this work, batch fermentation of H. polymorpha IBGE HP-5001 in YE-glycerol medium using different glycerol samples discharged from purification process of biodiesel production plant has been studied in a 5-L stirred tank bioreactor. It was found that H. polymorpha IBGE HP-5001 was capable of consuming glycerol in glycerol containing discharged streams for biomass production. The highest cell biomass production was observed in the fermentation of YE-glycerol media containing 5% pharma glycerol and 5% technical glycerol while low biomass yield was obtained in the fermentation of YE-glycerol media containing 50% residual glycerol and 9% crude glycerol due to high osmolarity. In order to reduce the production cost, the medium containing yeast extract as an enriched organic N-source was replaced by the minimal salts medium. Due to a large amount of salts remained untreated in the medium, an inorganic N-source ((NH4)2SO4) with supplemented salts (MgSO4 and KH2PO4) even caused higher osmotic pressure as compared to those in the YE-glycerol medium. This resulted in low biomass production. Salt removal from discharged glycerol is recommended to obtain the higher cell biomass production.

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