Comparison of Oxidative Stability of Monogalactosyl Diacylglycerol, Digalactosyl Diacylglycerol, and Triacylglycerol Containing Polyunsaturated Fatty Acids

Abstract

Oxidative stability of three different lipid classes, namely, monogalactosyl diacylglycerol (MGDG) and digalactosyl diacylglycerol (DGDG) from spinach and edible brown seaweed (Akamoku) and triacylglycerol (TAG) of linseed oil was compared. Analysis of oxygen consumption and polyunsaturated fatty acid (PUFA) composition demonstrated that spinach DGDG had the highest oxidative stability, followed by Akamoku DGDG, Akamoku MGDG, spinach MGDG, and linseed TAG. These results disagree with the order of oxidative stability expected from the average number of bis-allylic positions of each lipid. Additionally, DGDG constituents of both spinach and Akamoku showed higher oxidative stability than their MGDG constituents. The unusual oxidative stability of MGDG and DGDG could be conferred by the protection of bis-allylic positions of the PUFA against oxidative attack by the galactosyl moiety of the GL.

Roles and action mechanisms of herbs added to the emulsion on its lipid oxidation

“…Under these circumstances, the transfer mechanism for antioxidants changes from diffusion to collision-exchange-separation (Laguerre et al, 2017 ). Amphiphilic compounds in the O/W emulsion arrange themselves to position the polar head groups at the surface and non-polar tails in the interior (Hazahari et al, 2018 ). Amphiphilic compounds exceeding the critical micelle concentration protect the lipids against oxidation by diluting the substrate or perhaps by replacing lipids at the interface, making it less accessible to radical attack (Ponginebbi et al, 1999 ).…”

Digestibility and oxidative stability of plant lipid assemblies: An underexplored source of potentially bioactive surfactants?

“…Conversely, PC is more resistant. The oxidative stability of GL has been less documented although their PUFA content makes them potentially very sensitive to oxidation [88,89]. The comparisons of GL, PL and TAG reactivity have been conducted using sources with different unsaturation levels and they tend to indicate a higher stability of GL over PL, which are also more stable than TAG.…”

“…More recently, [88] have evaluated the oxidative stability of three types of lipids: MGDG and DGDG of spinach and algae, as well as TAG from linseed oil, previously purified from AO and PO impurities. The greater oxidative stability of DGDG and MGDG compared to TAG from linseed oil was evidenced, regardless of the source and despite higher unsaturation levels than in the TAG fraction.…”

Galactosyldiacylglycerols: From a Photosynthesis-Associated Apparatus to Structure-Defined In Vitro Assembling

“…55 Monodus subterraneus is a microalga containing biomass that can be used for human consumption and as ingredients in some functional foods. 69,72,73 The most wellknown compounds in M. subterraneus are the PUFAs. C20:5 ω3 (eicosapentaenoic acid, EPA) is highly accumulated (49%) in MGDG, and C16:1 fatty acid is the main fatty acid in DGDG.…”

“…C20:5 ω3 (eicosapentaenoic acid, EPA) is highly accumulated (49%) in MGDG, and C16:1 fatty acid is the main fatty acid in DGDG. 69,72,73 Besides, the ratio of MGDG/DGDG is known as 2:1, which means that M. subterraneus is a good source of EPA. EPA, a famous nutraceutical, is proven that it can prevent coronary heart disease and decrease high blood pressure and anti-inflammatory disorder.…”