RESUMO
Pterins, derivatives of 2-aminopteridin-4(3H)-one, are natural photosensitizers, common to many biological systems. Indications that these photosensitizers are also present in the sea-surface microlayer motivated the study of the photophysical and photochemical properties of 6-carboxypterin (CPT), which was chosen as a model for this group of photoactive compounds. The kinetics of excited CPT in the singlet and triplet state in the presence of halides and organics were studied in aqueous solutions at neutral pH by means of steady-state fluorescence and laser-flash photolysis. The fluorescence of CPT was efficiently quenched by two halides (iodide and bromide) and by four carboxylic acids (lactic, malonic, propionic and citric acid) with reaction rates close to the diffusion-controlled limit. In the triplet state, the triplet absorption spectrum was measured and its pH dependence was studied. The triplet state of CPT showed relatively high reactivity towards iodide, but no reaction with bromide or chloride could be observed. No singlet or triplet state quenching in the presence of limonene could be measured. A reaction mechanism is proposed, initiated by electron transfer from the quencher to the excited photosensitizer. This type of photo-induced reaction in the sea-surface microlayer has the potential to trigger the production of many oxidized species, including halogen atoms, in the bulk and gaseous phases.
RESUMO
RESUMO Este trabalho objetivou verificar se os profissionais de nível superior, ligados a Estratégia de Saúde da Família (ESF) do Município de Petrolina-PE percebem a importância, utilização e indicações de Plantas Medicinais e Fitoterápicos. Trata-se de um estudo transversal de caráter exploratório e descritivo, no qual participaram 96 profissionais de nível superior locados em Unidades da ESF. Os dados foram obtidos através de entrevista individual utilizando questionário semiestruturado. Para análise estatística, foi utilizado o teste Pearson Qui quadrado. As plantas medicinais mais citadas foram o Boldo (Plectranthus barbatus A.) e a Camomila (Matricaria recutita L.). Os fitoterápicos foram indicados apenas por 5 (5,2%) médicos e os mais citados foram Guaco® e Maracugina®. 36 (37,5%) dos profissionais acham que não estão preparados para repassar as informações sobre o uso de plantas medicinais e apenas 35 (36,5%) se sentem preparados para prescrever fitoterápicos. Observa-se a necessidade de capacitação e motivação desses profissionais para a utilização correta e segura das Plantas Medicinais e Fitoterapia.
ABSTRACT This study aimed to determine if the top-level professionals of the Strategy of Health of the Family, perceive the importance, use and indications of phytotherapy and Medicinal Plants. This is a cross-sectional, exploratory and descriptive study, with the participation 96 professionals serving in the family health strategy units. Data were collected through individual interviews in a semi-structured questionnaire. For statistical analysis, we used the Pearson Chi-square test. The most cited medicinal plants were the Boldo (Plectranthus barbatus A.) and Chamomile (Matricaria recutita L.). The phytotherapics were indicated only for 5 (5.2%) physicians and the most cited were Guaco® and Maracugina®. 36 (37.5%) of the professionals think are not prepared to pass on the information about the use of medicinal plants and only 35 (36.5%) feel prepared to prescribe phytotherapy. One observes the need for training and motivation of these professionals for the correct and safe use of Medicinal Plants and phytotherapy.