Abstract
The time course study of high monoester mixtures from soybean oil (HMMS) synthesis, as healthier alternatives to trans food products, in a supercritical CO2 (SCCO2) medium with and without enzyme, was investigated. Phosphorous nuclear magnetic resonance (31P-NMR) was used to quantify the absolute amount of partially esterified acylglycerols (PEGs). Carbon NMR was utilized to determine the type and position of the fatty acids (FAs) of HMMS. Enzyme and time significantly influenced the synthesis of 1-monoglycerides (1-MGs), 2-MGs, and 1,2-diglycerides (1,2-DGs) in this alcoholysis of soybean oil with 1,2-propanediol, based on high catalytic activity and operational stability of Novozym 435 in SCCO2 during short reaction time. Results suggest that 4 h is a suitable reaction time for this lipase-catalyzed interesterification (LIE) system for the synthesis of 2-MGs with a yield of 20%. The highest polyunsaturated fatty acid (PUFA) (65%) in the triglyceride (TG) of HMMS was produced after 4 h of reaction. After 6 h of reaction, a high level (20%) of saturated fatty acids (SFAs) was found in the TGs of HMMS, which were distributed between the sn-2 (5%) and sn-1, 3 (15%) positions.
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Abbreviations
- ANOVA:
-
Analysis of variance
- CIE:
-
Chemical interesterification
- CTDP:
-
2-Chloro-4,4,5,5-tetramethyl-1,3,2-dioxaphospholane
- CVD:
-
Cardiovascular disease
- DGs:
-
Diglycerides
- DHA:
-
Docosahexaenoic acid
- EPA:
-
Eicosapentaenoic acid
- FAs:
-
Fatty acids
- FDA:
-
Food and Drugs Administration-USA
- GRAS:
-
Generally recognized as safe
- HMMS:
-
High monoester mixtures from soybean oil
- LIE:
-
Lipase-catalyzed interesterification
- MGs:
-
Monoglycerides
- MUFAs:
-
Monounsaturated fatty acids
- PEGs:
-
Partially esterified acylglycerols
- 31P-NMR :
-
Phosphorous nuclear magnetic resonance
- PUFA:
-
Polyunsaturated fatty acid
- SCCO2 :
-
Supercritical CO2
- SFAs:
-
Saturated fatty acids
- SLs:
-
Structured lipids
- TG:
-
Triglyceride
- UFAs:
-
Unsaturated fatty acids
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This study was supported by the Manitoba Pulse and Soybean Growers (MPSG), The Natural Sciences and Engineering Research Council of Canada (NSERC), and Mitacs.
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Vafaei, N., Eskin, M.N.A., Rempel, C.B. et al. Interesterification of Soybean Oil with Propylene Glycol in Supercritical Carbon Dioxide and Analysis by NMR Spectroscopy. Appl Biochem Biotechnol 191, 905–920 (2020). https://doi.org/10.1007/s12010-019-03200-0
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DOI: https://doi.org/10.1007/s12010-019-03200-0