Title:	Length-scale specific crystalline structural changes induced by molecular randomization of pequi oil.
Authors:	GUEDES, A. M. M. ANTONIASSI, R. GALDEANO, M. C. GRIMALDI, R. CARVALHO, M. G. de WILHELM, A. E. MARANGONI, A. G.
Affiliation:	ANDREA MADALENA MACIEL GUEDES, CTAA; ROSEMAR ANTONIASSI, CTAA; MELICIA CINTIA GALDEANO, CTAA; Renato Grimaldi, UNICAMP; Mario Geraldo de Carvalho, UFRRJ; ALLAN EDUARDO WILHELM, CTAA; Alejandro Gregorio Marangoni, University of Guelph.
Date Issued:	2017
Citation:	Journal of Oleo Science, v. 66, n. 5, may 2017. p. 469-478.
Description:	Pequi fruit (Caryocar brasiliense Camb) is considered important since its pulp has a high content of oil and carotenoids. The oil?s triacylglycerols (TAGs) contain mainly oleic (~57%) and palmitic (~36%) fatty acids, distributed primarily among POO, POP/PPO, and OOO TAGs. It displays a tendency to fractionate upon storage and has a relatively low melting temperature (SFC of 4% at 25?). Pequi oil was modified through chemical interesterification, which increased the PPP content to ~6%. This caused a flattening in the SFC-temperature profile, raising the end of melt temperature significantly (SFC of 4% at 39?). The interesterified oil does not fractionate and is thermally stable up to 40?, with an SFCtemperature profile resembling that of roll-in shortening (SFC of 31% at 16?) despite containing high amounts of oleic acid. Crystallization and melting behavior changed. Crystal packing became more disorganized as evidenced by a significant decrease in crystalline domain size in the [001] direction from 42.3 nm to 32.1 nm. Polymorphism remained of the triclinic (?) subcell type but polytypism changed from the 3L to the 2L type. Polarized light microscopy demonstrated that interesterification dramatically decreased crystal size, consistent with a higher rate of nucleation in the material. Moreover, the dramatic improvement in physical stability and functionality was not accompanied by a significant decrease in total carotenoid content (~390 mg/kg).
Thesagro:	Caryocar Brasiliense
NAL Thesaurus:	crystallization melting
Keywords:	Interesterification Triacylglycerol Crystalline domain size
ISSN:	1347-3352
DOI:	10.5650/jos.ess16192
Type of Material:	Artigo de periódico
Access:	openAccess
Appears in Collections:	Artigo em periódico indexado (CTAA)