Fotofísica de carotenóides e o papel antioxidante de b-caroteno

Cardoso, Simone C.

doi:10.1590/s0100-40421997000500014

Cited by 23 publications

(14 citation statements)

References 44 publications

(59 reference statements)

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“…In addition, lipid peroxidation can be related to the reduction of chlorophyllous pigments, particularly carotenoids, which function as photoprotective structures (Taiz e Zieger, 2013). The photoprotection mechanism involves the suppression of the triplet states of chlorophyll, thus avoiding formation of singlet oxygen ( 1 O2) (Cardoso, 1997;Taiz e Zieger, 2013). Therefore, the carotenoids reduction leads to increased free radicals in plants, which triggers a series of processes such as, for example, lipid peroxidation.…”

Section: Resultsmentioning

confidence: 99%

Surfatante siliconado e glyphosate no controle de Brachiaria decumbens

Teixeira¹,

Veronese

Christoffoleti

2015

RBHerbicidas

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-The research goal was to evaluate the effects of silicone surfactant and simulated rainfall in glyphosate efficiency in controlling Brachiaria decumbens. The experiments were carried out at (a unit of the University of São Paulo) Escola Superior de Agricultura Luiz de Queiroz (ESALQ -Luiz de Queiroz College of Agriculture) in greenhouse conditions, in a randomized block design with four replications. In one experiment, a simulated rainfall of 10 mm was carried out, 30 minutes after treatments application, and in the other there was no simulation. The treatments were arranged in a 5x3 factorial arrangement, with the first factor corresponding to the doses of glyphosate (0, 135, 270, 540 and 1080 g ha -1 a.e.), and the second one to the doses of silicone surfactant (0, 50 and 100 mL ha -1 ). The applications were performed at 30 days after sowing. In the presence of a simulated rainfall, the percentage of control was increased and chlorophyll content was reduced in the dose of 135 g ha -1 a.e. of glyphosate, together with 100 mL ha -1 of silicone surfactant. Increase in lipid peroxidation was also observed with the addition of 100 mL ha -1 . In the experiment without a simulated rain, at seven days after treatments application, a higher percentage of control was observed at doses of 540 and 1080 g ha -1 a.e. with 100 mL ha -1 of silicone surfactant. Therefore, the use of silicone surfactant at a dose of 100 mL ha -1 increases the efficiency of glyphosate in the control of Brachiaria decumbens in the absence of simulated rain and rain conditions held for half an hour after application.

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Section: Resultsmentioning

confidence: 99%

Surfatante siliconado e glyphosate no controle de Brachiaria decumbens

Teixeira¹,

Veronese

Christoffoleti

2015

RBHerbicidas

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“…Among the natural pigments, carotenoids are considered important in human nutrition because they include precursors of vitamin A with antioxidant action (β-carotene) and other antioxidants such as lycopene (CHITARRA; CHITARRA, 1990;BARTLEY;SCOLNIK, 1995;CARDOSO, 1997). Chloroplasts contain most of the enzymes necessary for the synthesis of chlorophyll, fatty acids and galactolipids, and carotenoids, among other compounds (KROGMANN, 1973).…”

Section: Proteinsmentioning

confidence: 99%

Physicochemical changes in cubiu fruits (Solanum sessiliflorum Dunal) at different ripening stages

Júnior

Andrade

2012

Food Sci. Technol

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Cubiu shrubs (Solanum sessiliflorum Dunal) have drawn the attention of researchers for their biological versatility (preferential heliophilous or facultative ombrophilous shrubs), their capacity to grow in upland or lowland areas, and the good technological quality of their fruits for the food industry. The aim of this study was to verify physicochemical changes in cubiu fruits during maturation. The fruits were harvested from the experimental station of olericulture of the Instituto Nacional de Pesquisas da Amazônia (INPA), Brazil. The analyses were performed in whole cubiu fruits (peel, pulp, and placenta) at four traditional ripening stages (green, turning, ripe, and fully ripe) for the determination of weight, moisture, total solids, total carotenoids, proteins, lipids, and ash. Cubiu fruits showed large weight variation, with amodal distribution. The ripe stage was critical to maintain moisture, and from that stage on, water loss became evident. The lipids increased steadily over the four ripening stages, maintaining, however, insignificant calorie content. Total carotenoids, proteins, and ash reached the maximum level at the fully ripe stage. With the exception of weight and moisture, all physicochemical changes exhibited the same general behavior, i.e. they increased as the fruits ripened at the four investigated stages.

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“…Os carotenóides são conhecidos ainda pela sua eficiência em desativar 1 O 2 e espécies tripletes de moléculas fotossensibilizadas, além de sua habilidade em interagir com outras espécies reativas, formando adutos ou carotenóides radicalares, inibindo processos oxidativos 89 . A eficácia dos carotenóides está relacionada ao número de li-…”

Section: Uso De Substâncias Antioxidantes E Sua Relação Risco-benefíciounclassified

Antioxidantes na manutenção do equilíbrio redox cutâneo: uso e avaliação de sua eficácia

Guaratini¹,

Medeiros²,

Colepicolo³

2007

Quím. Nova

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Recebido em 12/12/05; aceito em 13/2/06; pleblicado na web em 30/8/06 ANTIOXIDANTS IN THE SKIN: APPLICATIONS AND EVALUATION OF THEIR EFFICACY. The skin is a very complex organ, continuously exposed to physical, chemical and microbiological agents. Enzymes as well as low-molecular weight antioxidants are present in the cutaneous tissue to counterbalance the deleterious effect caused by an oxidative stress and thus maintain homeostasis. Antioxidants such as vitamins C and E, carotenoids, and extracts with these properties have been extensively used for treatment of pathologies and skin aging prevention. We review here different mechanisms that can interfere in the redox equilibrium of the skin, as well as the chemical reactions involved in these processes. Moreover, we discuss the importance of endogenous or exogenous antioxidants that can be acquired from the diet or from oral or topical administration, and methodologies that have been developed to evaluate their efficacy Keywords: skin, antioxidants; efficacy. INTRODUÇÃOA pele é um órgão complexo, formado por diferentes estruturas e com diversos tipos celulares (Figura 1), que atua como uma barreira protetora dos órgãos internos ao ambiente, enquanto mantém o balanço entre proliferação e descamação celular 1 . Mais que qualquer outro tecido, é exposta a inúmeros agentes químicos, físi-cos e microbiológicos, muitos dos quais induzem à formação de espécies reativas de oxigênio (ERO) e de nitrogênio (ERN). Estas espécies são fundamentais em diversos processos fisiopatológicos e bioquímicos, mantendo a sobrevivência e a homeostase celular, sendo que há um equilíbrio refinado entre sua formação e remoção. Porém, quando há alterações acentuadas neste equilíbrio, um estado pró-oxidante é gerado, levando assim ao chamado estresse oxidativo 2 .Neste contexto, fica claro que a pele, por sua importância, é um órgão cujas células possuem mecanismos enzimáticos de resposta rápida, bem como moléculas antioxidantes de baixo peso molecular para contrabalançar o efeito deletério causado por um estresse oxidativo

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Fotofísica de carotenóides e o papel antioxidante de b-caroteno

Cited by 23 publications

References 44 publications

Surfatante siliconado e glyphosate no controle de Brachiaria decumbens

Surfatante siliconado e glyphosate no controle de Brachiaria decumbens

Physicochemical changes in cubiu fruits (Solanum sessiliflorum Dunal) at different ripening stages

Antioxidantes na manutenção do equilíbrio redox cutâneo: uso e avaliação de sua eficácia

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