From Trioleoyl glycerol to extra virgin olive oil through multicomponent triacylglycerol mixtures: Crystallization and polymorphic transformation examined with differential scanning calorimetry and X-ray diffration techniques
| Autor: | Laura Bayés-García, Teresa Calvet, Satoru Ueno, M. A. Cuevas-Diarte |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
0301 basic medicine
Polymorphism (Crystallography) Quality Control Analytical chemistry Crystallography X-Ray Phase Transition law.invention 03 medical and health sciences chemistry.chemical_compound 0404 agricultural biotechnology Differential scanning calorimetry law Glycerol Transition Temperature Triglicèrids Crystallization Olive Oil Triglycerides 030109 nutrition & dietetics Chromatography Calorimetry Differential Scanning Chemistry Fraud X-ray Polimorfisme (Cristal·lografia) 04 agricultural and veterinary sciences 040401 food science Oli d'oliva Polymorphism (materials science) X-ray crystallography Olive oil Food Analysis Synchrotrons Triolein Food Science |
| Zdroj: | Dipòsit Digital de la UB Universidad de Barcelona |
| ISSN: | 1873-7145 |
| Popis: | The polymorphic crystallization and transformation behavior of extra virgin olive oil (EVOO) was examined by using differential scanning calorimetry (DSC) and X-ray diffraction with both laboratory-scale (XRD) and synchrotron radiation source (SR-XRD). The complex behavior observed was studied by previously analyzing mixtures composed by its main 2 to 6 triacylglycerol (TAG) components. Thus, component TAGs were successively added to simulate EVOO composition, until reaching a 6 TAGs mixture, composed by trioleoyl glycerol (OOO), 1-palmitoyl-2,3-dioleoyl glycerol (POO), 1,2-dioleoyl-3-linoleoyl glycerol (OOL), 1-palmitoyl-2-oleoyl-3-linoleoyl glycerol (POL), 1,2-dipalmitoyl-3-oleoyl glycerol (PPO) and 1-stearoyl-2,3-dioleoyl glycerol (SOO). Molten samples were cooled from 25 °C to − 80 °C at a controlled rate of 2 °C/min and subsequently heated at the same rate. The polymorphic behavior observed in multicomponent TAG mixtures was interpreted by considering three main groups of TAGs with different molecular structures: triunsaturated OOO and OOL, saturated-unsaturated-unsaturated POO, POL and SOO, and saturated-saturated-unsaturated PPO. As confirmed by our previous work, TAGs belonging to the same structural group displayed a highly similar polymorphic behavior. EVOO exhibited two different β'-2 L polymorphic forms (β'2-2 L and β'1-2 L), which transformed into β'-3 L when heated. Equivalent polymorphic pathways were detected when the same experimental conditions were applied to the 6 TAG components mixture. Hence, minor components may not exert a strong influence in this case. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect