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.
Highlights
Monogalactosyl diacylglycerol (MGDG), digalactosyl diacylglycerol (DGDG), and sulfoquinovosyl diacylglycerol (SQDG) are the main lipid constituents of plant leaves (Figure 1) [1]
This study evaluated the oxidative stability of GL by comparing the oxidative stability of 5 types of lipids: spinach monogalactosyl diacylglycerol (MGDG), spinach DGDG, brown seaweed MGDG, brown seaweed DGDG, and linseed oil triacylglycerol (TAG)
Akamoku 62 8 30 visible spots with small streaks of chlorophyll were observed during thin layer chromatography (TLC) analysis with Spinach MGDG and Akamoku MGDG, while both Spinach DGDG and Akamoku DGDG were free from spots containing small streaks of chlorophyll after the first purification
Summary
Monogalactosyl diacylglycerol (MGDG), digalactosyl diacylglycerol (DGDG), and sulfoquinovosyl diacylglycerol (SQDG) are the main lipid constituents of plant leaves (Figure 1) [1]. These polar lipids are known to be the major constituents of seaweeds [2] [3]. Most PUFAs in seaweed GL are stearidonic acid (SA, 18:4n-3), arachidonic acid (AA, 20:4n-6), and eicosapentanoic acid (EPA, 20:5n-3) [2] [6]. Despite the higher levels of oxidatively unstable PUFAs, GLs, a main lipid component of the chloroplast, are continuously subjected to oxidative stress because of the absorption of light energy during photosynthesis
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