SANTOS, K. O.; http://lattes.cnpq.br/8459927660667894; SANTOS, Kleiton Oliveira.
Resumo:
Due to the notoriety of açaí being rich in functional biomolecules, this work is motivated by
the need to investigate this fruit as a good source of anthocyanins. THE This dissertation
is developed by searching for answers to these research problems: What are the main
anthocyanin biomolecules in tropical fruit - açaí? As Photoacoustic Spectroscopy, together
with the calculation of electronic transitions via TDDFT explains RED SHIFT, due to
the functional groups of these molecules and their positions in the structure? In order
for answers to be presented to these questions, the general objective of this investigation
is to verify the functional anthocyanins biomolecules in açaí in natura. Specifically, the
objectives are: 1) to associate the use of Photoacoustic Spectroscopy together with the
calculations of electronic transitions via TDDFT; 2) analyze the observed RED SHIFT
in the six main identified anthocyanins, according to the functional groups and their
positions in the structure. For the effectiveness of this verification, açaí samples were
obtained fresh from the Amazon region and analyzed by means of the photoacoustic
spectrometer belonging to the Laboratory of Photoacoustics, Academic Unit of Physics,
Federal University of Campina Grande; together with Time Dependent Functional Theory
(TDDFT) calculations and UV-Visible spectra found in the literature. The analysis and
discussions produced showed that the photoacoustic technique allowed the aforementioned
identification without the use of a solvent, which would shift the peaks to longer lengths.
In summary, the meticulous literature review and systematic analysis developed reveal
the unprecedentedness of this work, using the photoacoustics technique, combined with
TDDFT calculations, both applied in fresh açai, to analyze the anthocyanin group.