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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Análise dos constituintes químicos do pólen e da inflorescência de Stryphnodendron polyphyllum, em relação à cria-ensacada brasileira em Apis mellifera / Analysis of chemical components of pollen and inflorescence of Stryphnnodendron polyphyllum, with relation to Brazilian encapsulated- larvae disease in Apis mellifera

Santos, Mara Lúcia de Azevedo 18 August 1999 (has links)
Submitted by Reginaldo Soares de Freitas (reginaldo.freitas@ufv.br) on 2017-03-08T16:43:05Z No. of bitstreams: 1 texto completo.pdf: 564049 bytes, checksum: 4e2aaffba113a5a7cfe889fd50aa6203 (MD5) / Made available in DSpace on 2017-03-08T16:43:05Z (GMT). No. of bitstreams: 1 texto completo.pdf: 564049 bytes, checksum: 4e2aaffba113a5a7cfe889fd50aa6203 (MD5) Previous issue date: 1999-08-18 / Conselho Nacional de Desenvolvimento Científico e Tecnológico / O objetivo deste trabalho foi analisar os constituintes químicos do pólen de Stryphnodendron polyphyllum (barbatimão), causador da doença cria-ensacada brasileira (CEB) em Apis mellifera. Para isso, coletaram-se pólen e inflorescência de barbatimão para serem submetidos a extrações sucessivas com hexano e, posteriormente, com etanol. Com os extratos hexânico e etanólico do pólen e da inflorescência obtidos, foram realizados ensaios biológicos, nos quais se verificaram pré-pupas com sintomas da doença nos tratamentos em que as larvas eram alimentadas com dieta de operária mais extrato etanólico. Observou-se a presença de taninos nos extratos etanólicos, tendo sido determinado nestes 7,91 e 21,43% de taninos no pólen e na inflorescência, respectivamente. Com o fracionamento do extrato etanólico do pólen, isolaram-se ainda ácidos graxos e frutose, que foram submetidos a ensaios biológicos. Essas frações não determinaram o aparecimento de sintoma da CEB nas abelhas tratadas. Como várias espécies de barbatimão são conhecidas por possuírem altas concentrações de tanino, realizaram-se ensaios biológicos com concentrações diferentes de ácido tânico para verificar o seu efeito no desenvolvimento das crias de abelhas. Observou-se a presença de sintomas da doença e de alta mortalidade das crias tratadas a partir da terceira alimentação com dieta contendo diferentes concentrações de ácido tânico, tendo sido estimada uma CL50 de 0,012% no referido composto. Diante desses resultados, concluiu-se que o constituinte químico responsável pelos sintomas da cria-ensacada brasileira está presente na fração etanólica do pólen, podendo pertencer ao grupo dos taninos. Os resultados dos ensaios biológicos obtidos com a inflorescência foram semelhantes àqueles conseguidos com o pólen. / The objective of this study was to analyze quimical components of Stryphnnodendron polyphyllum pollen, which cause the Brazilian encapsulated- larvae disease (CEB) in Apis mellifera. Pollen and inflorescence of Stryphnnodendron polyphyllum were collected and gone through successive extraction with hexane and later with ethanol. Biological assays were carried out with the hexane and ethanol extracts obtained from pollen and inflorescence. In those assays it was verified the presence of pre-pupae showing the symptoms of the disease in the treatments where the larvae were fed with the working bees diet supplemented with ethanol extract. It was detected the presence of tannins in ethanol extracts, which was found to be 7,91 and 21,43% of tannins for pollen and inflorescence, respectively. Fructose and fatty acids were isolated from pollen ethanol extract fractionation and were gone through biological assays; in these fractions no symptom of CEB was detected in the treated bees. Since several Stryphnnodendron species are known as containing high tannin concentrations, biological assays using different concentrations of tannic acid were carried out to verify its effect on bee young development. It was observed the presence of CEB symptoms and a high mortality of the young which were treated, from the third feed onwards, with diet containing different concentrations of tannic acid, whose CL50 was estimated at 0,012%. Based on these results, it was concluded that the chemical component which is responsible for the CEB symptoms is present in the ethanol fraction of pollen and it may belong to the tannin group. The results obtained from the inflorescence biological assays were similar to those from pollen.

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