Extraction of dairy phospholipids using switchable solvents: A feasibility study

Document Type

Abstract

Publication Date

2019

Location

2019 American Dairy Science Association Annual Meeting: Cincinnati, Ohio

Publisher

American Dairy Science Association

Journal

Journal of Dairy Science

Volume

102

Issue

Suppl.1

Pages

147

Language

en.

Keywords

phospholipid, switchable solvent, byproduct

Abstract

Phospholipids (PLs) are found as lipid bilayers in all plant and animals cells membranes. Dairy PLs are located in the milk fat globule membrane, and they account for about 1–4% of the total milk fat depending on the season and lactation stage. The consumption of PLs has been associated with numerous health benefits including reducing heart disease, cholesterol adsorption, and improved immunological functions. Dairy foods and their byproducts represent a natural source of PLs with great potential for isolation and further commercialization. The current extraction of dairy PLs involves various steps (concentration, solvent separation, lipid recovery and fractionation) within the entire process, which results in low overall efficiency and economically unviable. This study aimed at evaluating the feasibility of a primary amine (N,N-dimethylcyclohexylamine) as a switchable hydrophilicity solvent (SHS) for extracting dairy PLs. For comparison, PLs were also extracted using the Folch method (FM) consisted of chloroform and methanol mixture, and Mojonnier method (MM). PLs were extracted from 4 different matrix (raw cream, buttermilk, b-serum and buttermilk concentrate), and they were qualitatively characterized by thin layer chromatography. The extraction was performed at room temperature using different SHS ratios (3/1, 6/1, and 12/1 wt/wt). After extraction, the solvent was removed from the extract by bubbling CO2 at atmospheric pressure. The lipid yield obtained from SHS method for raw cream was found to be higher (28.9 ± 1.3%) than FM and MM, 27.4 ± 1.6% and 29.2 ± 1.3%, respectively. Contrary, higher values of lipid yield were obtained for buttermilk, concentrated buttermilk, and B-serum using MM. Interestingly, the recovered fraction of PLs using the SHS extraction at a ratio of 12/1 was substantially higher than FM and MM. The recovered fraction of PLs for raw cream, b-serum, and buttermilk concentrated were 0.33, 7.5, 77.2, and 99.9%, respectively. These results demonstrated the feasibility of using SHS such as N,Ndimethylcyclohexylamine for the extraction of dairy PLs.

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