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Organogel‐Based Emulsion Systems, Micro‐Structural Features and Impact on In Vitro Digestion
Author(s) -
Duffy Nicola,
Blonk Han C. G.,
Beindorff Christiaan M.,
Cazade Magali,
Bot Arjen,
Duchateau Guus S. M. J. E.
Publication year - 2009
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/s11746-009-1405-4
Subject(s) - emulsion , lipase , micelle , digestion (alchemy) , chemical engineering , structuring , hydrolysis , materials science , phase (matter) , microemulsion , chemistry , chromatography , organic chemistry , enzyme , biochemistry , pulmonary surfactant , finance , aqueous solution , engineering , economics
Organogels based on edible oils and specific mixtures of phytosterols can serve as structured systems with a low saturated fat content. These low‐SAFA organogels can be used also to create o/w emulsions. Little is known about the structures formed in these specific organogels and at the emulsion interface. We studied o/w organogels on different length scales to describe and understand their micro‐structural features. Very basic processing conditions such as composition, temperature and storage time were taken into account. Two different types of structure were observed; at the smallest scale, long thin crystals are formed out of the oil phase into the continuous water phase. We propose that these are needle‐like crystals. Next, tube‐like structures are identified and can be visualized as tubular micelles. A model is proposed which fits the dimension (~7 nm) with the length scale of the molecular building blocks (TAGs and sterols). As edible fats from food products are enzymatically hydrolyzed in the gut prior to absorption, we also looked into the impact on the lipase reaction speed. Simple in vitro enzymatic hydrolysis experiments showed a slower enzymatic digestion. Organogel systems and emulsion made thereof have interesting food structuring properties with possible advantages in composition (low SAFA) and digestion speed.