A5027585103- Porphyrin and Phthalocyanine Chemistry
- Photodynamic Therapy Research Studies
- Nonlinear Optical Materials Studies
- Photochemistry and Electron Transfer Studies
- Plant-Derived Bioactive Compounds
- Luminescence and Fluorescent Materials
- Nanoplatforms for cancer theranostics
- Phytochemistry Medicinal Plant Applications
- Phytochemical compounds biological activities
- Spectroscopy and Quantum Chemical Studies
- Protein Interaction Studies and Fluorescence Analysis
- Nonlinear Optical Materials Research
- Herpesvirus Infections and Treatments
- Plant biochemistry and biosynthesis
- Photochromic and Fluorescence Chemistry
- Carcinogens and Genotoxicity Assessment
- Agricultural and Food Sciences
- Laser-Matter Interactions and Applications
- Plant tissue culture and regeneration
- Photoreceptor and optogenetics research
- Advanced Fiber Laser Technologies
- Biodiesel Production and Applications
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Aquaculture Nutrition and Growth
Universidade Federal de Goiás
2016-2025
Universidade Estadual de Goiás
2018
Universidade de São Paulo
2000-2008
Universidade de Ribeirão Preto
2006
Abstract The latex obtained from Hancornia speciosa Gomes (Mangabeira tree) is widely used in traditional medicine to treat a variety of diseases, including diarrhea, ulcer, gastritis, tuberculosis, acne and warts. In this study, the cytotoxicity genotoxicity effects H. on root meristem cells Allium cepa were examined. Onion bulbs exposed different concentrations then submitted microscopic analysis using Giemsa stain. Water was as negative control sodium azide positive control. results...
In this work the influence of thermal treatments on structural and electronic properties synthetic melanins was investigated. To that end, gravimetry, infrared spectroscopy, electron spin resonance, dc conductivity were employed. Our results indicate water corresponds to 10%–20% mass melanin also show latter is rich in mobile interlayer hydrogens or protons. Extended heating above 60°C decreases by three orders magnitude increases density a factor 3. This enhanced concentration decreased are...
The present work employs a set of complementary techniques to investigate the influence outlying Ru(II) groups on ground- and excited-state photophysical properties free-base tetrapyridyl porphyrin (H(2)TPyP). Single pulse train Z-scan used in association with laser flash photolysis, absorbance fluorescence spectroscopy, decay measurements, allowed us conclude that presence causes significant changes both electronic structure vibrational porphyrin. Such modifications take place mainly due...
Bone loss is a common problem after accidental traumas, cancers, congenital defects, and surgical procedures. The techniques normally used in large bone restoration involve complex invasive procedures such as grafting. Thus, it of interest to develop alternatives bioactive materials induce accelerated regeneration. Natural rubber (NR) membranes are potential candidates due their characteristics biocompatibility, angiogenic potential, flexibility, mechanical stability, surface porosity,...
Paracoccidioidomycosis (PCM) is a systemic mycosis caused by Paracoccidioides brasiliensis. Currently, the treatment approach involves use of antifungal drugs and requires years medical therapy, which can induce nephrotoxicity lead to resistance in yeast strains. Photodynamic inactivation (PDI) new therapy capable killing microorganisms via combination nontoxic dye with visible light generate toxic reactive oxygen species (ROS). We investigated phototoxic effect...
We propose a combination of different techniques to obtain the absorption cross-section spectra triplet- and singlet-states in porphyrin-like molecules. Two extensions Z-scan technique are employed (pulse train white-light Z-scan) together with absorbance spectroscopy laser flash photolysis. This approach allowed us investigate features excited-states meso-tetrakis (methylpyridiniumyl) porphyrin (TMPyP) that revealed influence solvents on vibronic structuration transitions assigned...
The Hancornia speciosa latex reveals angiogenic, osteogenic, and anti-inflammatory properties, which present its potential for developing of wound healing drugs; however, the compounds responsible angiogenesis remain unknown. One strategy to screen these active is evaluation fractions. This study aimed obtain different fractions evaluate angiogenic activity separately using chick chorioallantoic membrane (CAM) assay. serum (SE) fraction was angiogenesis, subject biochemical characterization...
This work employs the Z-scan technique with 120fs pulses to investigate singlet excited state absorption spectra of tetrapyridyl and tetrasulfonatophenyl porphyrins. We have used a three-energy-level model adjust curves in order obtain cross section from 460to800nm. Starting these values, we determine ratio between ground sections, whose values are as good best found literature for reverse saturable absorbers. The results obtained point porphyrins candidates applications optical limiting...
In this work, the photodynamic efficiency of anionic meso-tetrakis sulfonophenyl (TPPS4), cationic methylpyridiniumyl (TMPyP) and their zinc complexes (ZnTPPS4 ZnTMPyP) in inactivation Bovine herpesvirus type 1 (BoHV-1) was evaluated. At a non-cytotoxic concentration, all porphyrins showed significant antiviral activity after irradiation using halogen lamp. The higher than that ones. Porphyrin complexation with increases its lipophilicity number absorbed photons, dramatically reducing time...
The excited state dynamics of Zn2+, Fe3+, and Mn3+ meso-tetra(sulfonatophenyl) porphyrin complexes were investigated with a Z-scan technique at 532 nm using 70 ps 120 fs single pulses 200 ns pulse trains Q-switched mode locked laser. We determined the characteristic interconversion intersystem crossing times, quantum yields S1 state, → Sn T1 Tn transition cross-sections. ground cross-sections obtained UV−vis absorption spectroscopy, five-energy-level diagram was used to yield photophysical...
We report on a method to study the dynamics of triplet formation based fluorescence signal produced by pulse train. Basically, train acts as sequential pump-probe pulses that precisely map excited-state in long time scale. This allows characterizing those processes affect population evolution first excited singlet state, whose decay gives rise fluorescence. The technique was proven be valuable measure parameters organic molecules. Additionally, this single beam has advantages simplicity, low...