Publications by authors named "Anna Luiza B Brito"
Semi-quantitative chemometric models for characterization of mixtures of sugars using infrared spectral data.
Spectrochim Acta A Mol Biomol Spectrosc
February 2025
Sugars (saccharides) are sweet-tasting carbohydrates that are abundant in foods and play very important roles in living organisms, particularly as sources and stores of energy, and as structural elements in cellular membranes. They are desirable therapeutic targets, as they participate in multiple metabolic processes as fundamental elements. However, the physicochemical characterization of sugars is a challenging task, mostly due to the structural similarity shared by the large diversity of compounds of this family.
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- 6-Bromopyridine-2-carbaldehyde (BPCA) is a chemical compound used in supramolecular chemistry and as a ligand for catalysts and luminescent complexes, with its structure and vibrational properties studied under different conditions.
- The research involved analyzing infrared and Raman spectra of BPCA in its crystalline form and isolated in cryogenic matrices, revealing that intermolecular interactions don't significantly affect its intramolecular vibrations.
- Findings indicated that the BPCA conformer in the crystal is the most stable form of the isolated molecule, and exposure to UV light can convert it into a higher-energy form, leading to decarbonylation and the formation of 2-bromopyridine.
5-Chlorosalicylaldehyde (abbreviated as 5CSA) is an important chemical used in the synthesis of fragrances, dyes, and pharmaceuticals. In this investigation, 5CSA isolated in solid N, at 10 K, and in its neat amorphous and crystalline phases, at 50 and 190 K, respectively, were investigated by infrared spectroscopy and DFT(B3LYP)/6-311++G(d,p) calculations. The systematic theoretical analysis of the 5CSA conformational landscape showed that the compound exhibits four different conformers, which were structurally characterized in detail.
View Article and Find Full Text PDFInvestigation of menopause-induced changes on hair by Raman spectroscopy and chemometrics.
Spectrochim Acta A Mol Biomol Spectrosc
July 2022
Article Synopsis
- The study explores the effects of menopause on women's hair by examining changes in hair texture and growth due to reduced estrogen levels after menopause.
- Using Raman spectroscopy and advanced statistical methods, the researchers found that post-menopausal women have hair cuticles that are approximately 12% thinner than those of pre-menopausal women.
- The study developed a highly accurate classification model (96.6% accuracy) that improves upon traditional methods, providing a new approach for analyzing hair samples and their physiological changes related to menopause.