Affiliation:
1. Biorefinery Laboratory, Latvian State Institute of Wood Chemistry, LV-1006 Riga, Latvia
2. Laboratory of Finished Dosage Forms, Faculty of Pharmacy, Riga Stradiņš University, LV-1007 Riga, Latvia
3. ZS DOKTUS, LV-4101 Cesis, Latvia
Abstract
Structuring liquid oils into oleogels using natural and abundant biomass components as gelling agents is of great significance in fields such as foods, pharmaceuticals, and cosmetics. In this work, a more energy-efficient and technologically simpler approach for directly preparing birch outer bark extract particles containing oleogel was used. This method involves introducing birch outer bark extract particles into the oil phase directly from the extract solution, combining both the evaporation of solution and gel formation. As a result, stable oleogels of various vegetable oils (sunflower, almond, olive, and hemp seed) were obtained with birch outer bark extract particle contents of 4–10%. Infrared spectroscopy and particle size analysis confirmed that when increasing the content of extract particles in the oil, increasing self-assembly of extract particles via hydrogen bonding occurs, leading to the formation of a more structured network. This is consistent with gel strength values from rheological tests of oleogels, which also increased with particle concentration. The obtained oleogels showed important properties such as good tolerance to time-dependent deformation, shear thinning, and thermoreversibility.
Funder
European Regional Development Fund
Subject
Polymers and Plastics,Organic Chemistry,Biomaterials,Bioengineering
Reference43 articles.
1. Microemulsions, micelles, and functional gels: How colloids and soft matter preserve works of art;Chelazzi;Angew. Chem. Int. Ed.,2018
2. Oleogels: Promising alternatives to solid fats for food applications;Manzoor;Food Hydrocoll. Health,2022
3. Natural gelling agents: A review;Shah;Int. J. Univers. Pharm. Bio Sci.,2014
4. Preparation and characterization of glycerol monostearate and polyglycerol stearate oleogels with selected amphiphiles;Uslu;Food Struct.,2021
5. Apparatus and selective solvents for extraction of triterpenes from Silver birch (Betula pendula Roth.) outer bark;Zandersons;Balt. For.,2014