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Interesterification of Soybean Oil with Propylene Glycol in Supercritical Carbon Dioxide and Analysis by NMR Spectroscopy

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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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Funding

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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Correspondence to Martin G. Scanlon.

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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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