Developing of functional foods or edible health care products requires the design of suitable delivery system to protect, carry and release bioactive compounds, such as polyunsaturated fatty acids, tocopherols and carotenoids. Emulsion technology is found to be a useful tool to improve the delivery of lipophilic bioactive compounds. Spruce galactoglucomannans (GGM) are wood hemicelluloses that can be recovered at high quantity by lignocellulosic refining processes, such as with pressurized hot water extraction. GGM are bio-based, novel and sustainable compounds, which have the ability to efficiently emulsify and physically stabilize oil-in-water emulsions. In addition, lipid oxidation in GGM-stabilized emulsions is exceptionally inhibited. These features make GGM attractive alternatives for the conventional stabilizers of emulsions used in food applications. In this study, we investigated the applicability of GGM-stabilized emulsions for the delivery of polyunsaturated fatty acids by rapeseed oil. Changes occurring in the emulsion stability and bio-accessibility of lipids were investigated during in vitro digestion. The in vitro model constituted of oral, gastric and small intestinal phases. GGM-stabilized emulsions retained their morphology during oral and gastric phases. In small intestinal phase, GGM did not inhibit the action of pancreatic lipases but triacylglycerols were hydrolyzed efficiently into free fatty acids. At the same time, the oil droplets were disrupted. GGM remained stable during the digestion and no significant release of phenolic compounds, free mono-, di-, or oligosaccharides were detected. Thus, GGM-stabilized emulsions are potential delivery systems for bioactive compounds.

Spruce galatoglucomannan stabilized emulsions are potential carriers for bioactive compounds

255th National Meeting (2018)

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