Emprego de técnicas hifenadas na identificação de metabólitos secundários de 'Lychnophora ericoides' Mart. (Asteraceae) e determinação de suas variações populacionais e temporais

Abstract

GOBBO-NETO, L. Use of hyphenated techniques on the identification of secondary metabolites from Lychnophora ericoides Mart. (Asteraceae) and determination of their populational and temporal variations. 254 f. Thesis

A new HPLC-DAD-MS/MS method for the simultaneous determination of major compounds in the crude extract of Lychnophora salicifolia Mart. (Brazilian arnicão) leaves: Application to chemical variability evaluation

“…In a previous study conducted by our research group, Gobbo-Neto verified no significant variation between branches collected from the same plant [18]. Therefore, only one branch was collected from each individual plant at mid-height, and all the leaves of this branch were separated and ground.…”

Seasonal and Circadian Variation of Non‐Volatile Metabolites in Lippia alba Leaves

“…The highest concentrations of flavonoids are found in the early evening (9 pm) during the summer (rain season), and caffeoylquinic acids in the afternoon (12 pm to 6 pm ) during the winter (dry season and mild temperatures). [17] In another study, iridoid content in Antirrhinum majus also varies during the day. Although the variation is substantial, no pattern was observed.…”

“…This reduction was more intense for chlorogenic acids and flavonoids. [17] The seasonal study carried out with the Daucus carota species also identified that flavonoid concentrations are higher in the tissues of new leaves or new spring foliage. [27] In the leaves of Plantago lanceolata L. (Plantaginaceae), the older plants showed concentrations of aucubin, catapol, total iridoid glycosides, and nitrogen approximately one-half that of plants harvested 6 weeks earlier.…”

Fitoquímica e atividades biológicas de plantas do gênero Mikania (Asteraceae).

“…Atualmente, com os avanços da ciência principalmente nas técnicas cromatográficas e de elucidação estrutural, a fitoquímica também determina a influência de variações sazonais, circadianas e populacionais nesta constituição química (GOBBO-NETO, 2007).…”

“…Tabela 30 -Dados da análise em CLAE-DAD-EM/EM (modo negativo) em coluna monolítica C-18, do extrato metanólico bruto de M. camporum. (CLIFFORD, 2003(CLIFFORD, , 2005(CLIFFORD, e 2006GOBBO-NETO, 2007), propõe-se que os picos 1, 2 e 4 correspondam respectivamente aos ácidos clorogênicos 5-O-E-cafeoil quínico, 3,5-di-O-E-cafeoil quínico e 4,5-di-O-E-cafeoil quínico.…”