Chemosystematics of the lauraceae

Gottlieb, Otto R.

doi:10.1016/0031-9422(72)85001-5

Cited by 203 publications

(102 citation statements)

References 88 publications

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“…Otto Gottlieb subsequently introduced the term neolignan to encompass all non 8-8' linkages (39,40), and further modified this definition to encompass the products from allylphenol coupling (41). However, throughout the present volume the term lignan is used to describe all possible coupling products as long as the linkage type is specified (8-8', 8-5', 8-0^4' etc., Figure 4).…”

Section: Brief Historical Development Of Ideasmentioning

confidence: 99%

“…were also present in many plant species/tissues (39,40), and that lignan(e)s can also have much higher molecular weights. It is now known that lignans encompass a wide range of structural motifs (and molecular sizes) (39)(40)(41)123), rather than being restricted to the simple 8-8' linked dilignols as previously thought. A few examples are given for illustrative purposes in Figure 6.…”

Section: Biosynthesis Of Lignansmentioning

confidence: 99%

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Lignin and Lignan Biosynthesis: Distinctions and Reconciliations

Lewis

Davin

Sarkanen

1998

ACS Symposium Series

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Before 1996, the framework within which lignin biosynthesis was understood at the molecular level had not fundamentally changed for 4 decades. During the same period nothing at all had been explicitly proposed about the mechanistic basis for lignan formation in vivo. The associated deficit in plant biochemistry was not minor: lignins and lignans together account for roughly 30% of the organic carbon in vascular plants. On the other hand, the biochemical transformations in phenylpropanoid metabolism leading, via the shikimate-chorismate pathway through phenylalanine or tyrosine, to the so-called monolignols (namely, the monomeric lignin/lignan precursors) came to be reasonably well documented. Indeed, attention has more recently been drawn to the identification of de facto rate-limiting steps in the various metabolic segments of the pathway as potential control-points for biotechnological manipulation. The most curious characteristic usually attributed to the lignin/lignan biosynthetic pathway is that the monolignol-derived radical coupling processes leading to lignans are regio-and stereospecific, whereas those resulting in lignin macromolecules ostensibly are not. Now that the molecular basis for the dehydrogenative dimerization of monolignols to lignans has been unraveled, however, it appears likely that an analogous mechanism may be operative in the dehydrogenative polymerization of monolignols to lignins. The investigation of this possibility has indeed become a central concern in the field of lignin biosynthesis.It has been almost three decades (7) since a comprehensive attempt had been made to summarize and evaluate contending views about lignin biosynthesis. Accordingly, the present volume draws together the current, yet conceptually vastly differing, ideas about how lignin composition and structure are established in living plants. It differs from all prior contributions, not only in introducing fresh evidence to support a compelling new paradigm that seeks to understand how lignin structure is established in vivo, but also in including lignan biosynthesis for comparative purposes. Indeed it appears that the first committed step in lignan biosynthesis bears an important relationship to the manner in which the configurations of lignins are specified in vivo.

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Section: Brief Historical Development Of Ideasmentioning

confidence: 99%

Section: Biosynthesis Of Lignansmentioning

confidence: 99%

Lignin and Lignan Biosynthesis: Distinctions and Reconciliations

Lewis

Davin

Sarkanen

1998

ACS Symposium Series

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“…Benzoato de benzila foi anteriormente localizado em Cinnamomum zeylanicum Blume (Gottlieb, 1972) e Ocotea te/eiandra (Meissn.) Mez (Naves et a/., 1961).…”

Section: Compositaeunclassified

Óleos essenciais da Amazônia VII.

Gottlieb¹,

Koketsu

Magalhães

et al. 1981

Acta Amaz.

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“…O linalol também é o componente principal do óleo essencial de Aniba rosaeodora Ducke e Ocotea duckei Kosterm. (Lauraceae) (Gottlieb, 1972;Barbosa-Filho et al, 2008b) que alcança alto valor comercial pelo seu uso na indústria de perfumaria (Rizzini & Mors, 1976 (Moreira et al, 2001). Segundo Harborne (1991), a presença de derivados do cariofileno tem importância ecológica, pois são repelentes naturais contra formigascortadeiras, sendo o óxido de cariofileno mais efetivo.…”

Section: Análise Do óLeo Essencialunclassified

Anatomia e análise de óleo essencial das folhas de Hennecartia omphalandra J. Poisson (Monimiaceae)

Marques¹,

Leitão²,

Bizzo³

et al. 2009

Rev. bras. farmacogn.

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RESUMO:Descreve-se a morfo-anatomia e a análise de óleo essencial das folhas de Hennecartia omphalandra J. Poisson (Monimiaceae), uma planta tóxica. A ocorrência de tricomas unicelulares, estômatos paracíticos; braquiesclereídes em grupos no pecíolo e na lâmina foliar, além de esclereídes vermiformes e ramiformes; sistema vascular em arco, com extremidades voltadas para o centro no pecíolo e na forma de arco atenuado na lâmina foliar, sendo o padrão de venação uma variação do tipo craspedódromo-semicraspedódromo, além de óleo essencial armazenado em idioblastos oleíferos não especializados no mesofilo, foram considerados caracteres importantes que podem auxiliar na sua morfo-diagnose. A análise do óleo essencial das folhas revelou a presença de monoterpenos, sesquiterpenos e álcoois sesquiterpênicos, sendo este o grupo mais significativo. Os componentes majoritários identificados foram β-felandreno (24,0%), seguido por germacreno D (10,5%), sabineno (9,3%), biciclogermacreno (8,4%) e β-elemeno (5,3%). Unitermos:Hennecartia omphalandra, Monimiaceae, plantas tóxicas, anatomia foliar, óleo essencial.ABSTRACT: "Anatomy and essential oil analysis of the leaves from Hennecartia omphalandra J. Poisson (Monimiaceae)". This paper describes the morphological and anatomical aspects and the essential oil analysis of the leaves from Hennecartia omphalandra J. Poisson (Monimiaceae), a toxic plant. The presence of trichomes formed by a single cell, paracitic stomata, groups of braquisclereids in the petiole and leaf blade; vermiform and ramiform sclereids, vascular system in arc softly invaginated at ends in the petiole, and in a flat arc in the middle vein, being the venation pattern a variation of craspedodromous-semicraspedodromous type, and essential oil stored in oil idioblasts in the mesophyll were the most important characters that can help the morphological diagnosis. The analysis of essential oil of the leaves showed the presence of monoterpenes, as well as sesquiterpenes hydrocarbons and alcohols, being the latter the most significant group. The major identified compounds were β-phelandrene (24.0%), germacrene D (10.5%), sabinene (9.3%), bicyclogermacrene (8.4%) and β-elemene (5.3%).

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Chemosystematics of the lauraceae

Cited by 203 publications

References 88 publications

Lignin and Lignan Biosynthesis: Distinctions and Reconciliations

Lignin and Lignan Biosynthesis: Distinctions and Reconciliations

Óleos essenciais da Amazônia VII.

Anatomia e análise de óleo essencial das folhas de Hennecartia omphalandra J. Poisson (Monimiaceae)

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