Neutral Sterols of Cephalic Glands of Stingless Bees and Their Correlation with Sterols from PollenReportar como inadecuado




Neutral Sterols of Cephalic Glands of Stingless Bees and Their Correlation with Sterols from Pollen - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

PsycheVolume 2012 2012, Article ID 982802, 7 pages

Research ArticleDepartamento de Biologia, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto-FFCLRP, Universidade de São Paulo USP, Avenida Bandeirantes 3900, 14040-901 Ribeirão Preto, SP, Brazil

Received 2 August 2012; Revised 2 October 2012; Accepted 3 October 2012

Academic Editor: Kleber Del-Claro

Copyright © 2012 Maria Juliana Ferreira-Caliman et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Sterols are essential molecules in the membrane lipid composition and precursors of important sterol hormones that regulate many developmental processes. Insects are unable to synthesize sterolsde novo and, thus, all phytophagous insects depend on an exogenous source of sterols for growth, development, and reproduction. The sterol requirements of social bees are not fully known due to the fact that there is no well-defined diet available throughout the year with regard to floral resources. Our study aimed to characterize the sterols present in pollen stored in Melipona marginata and Melipona scutellaris colonies, as well as evaluating their presence in the mandibular, hypopharyngeal, and cephalic salivary gland secretions. We analyzed the chemical composition of pollen stored in the colonies and the composition of the cephalic glands of workers in three adult functional phases newly emerged, nurses, and foragers by gas chromatography and mass spectrometry. The results showed that the pollen analyzed contained campesterol, stigmasterol, sitosterol, isofucosterol, lanosterol, and small amounts of cholesterol. The glands showed the same compounds found in the pollen analyzed, except lanosterol that was not found in M. scutellaris glands. Surprisingly, cholesterol was found in some glands with relative ratios greater than those found in pollen.





Autor: Maria Juliana Ferreira-Caliman, Cláudia Inês da Silva, Sidnei Mateus, Ronaldo Zucchi, and Fabio Santos do Nascimento

Fuente: https://www.hindawi.com/



DESCARGAR PDF




Documentos relacionados