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QUÍMICA DA FOLHA DE BAUHINIA HOLOPHYLLA (BONGARD) STEUDEL / CHEMISTRY OF THE BAUHINIA HOLOPHYLLA (BONGARD) STEUDEL LEAF

Antonio Salatino
Boletim de Botânica da Universidade de São Paulo
Vol. 5 (1977), pp. 43-51
Stable URL: http://www.jstor.org/stable/42871363
Page Count: 9
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QUÍMICA DA FOLHA DE BAUHINIA HOLOPHYLLA (BONGARD) STEUDEL / CHEMISTRY OF THE BAUHINIA HOLOPHYLLA (BONGARD) STEUDEL LEAF
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Abstract

Do extrato clorofórmico, foi isolada u'a mistura de dois alcanos que, através de espectrometría de massa e no infravermelho, foram identificados como n-nocacosano e n-untriacontano. Do mesmo extrato, foi isolada uma outra substância e através de dados expectrais concluiu-se que se trata de um composto de cadeia longa, apresentando grupamento hidroxila e carbonila. Todos os três compostos são, presumivelmente, componentes da cutícula. A análise cromatográfica em camada delgada revelou a presença de três glicosidos flavonóides. Os três apresentam a mesma aglicona, identificada como quercetina, através de comparação de seu espectro no infravermelho com o de uma amostra autêntica. Os açúcares constituintes dos glicosidos foram identificados cromatograficamente como glicose, galactose e ramnose. Taninos condensados também estão presentes, alem de traços de ácido tartárico. A mixture of two alkanes was isolated from the chloroform extract. Through spectral analysis (IR and MS) the mentioned hydrocarbons were identified as n-nonacosane and n-hentriacontane. Another compound was isolated from the same extract and through spectral data was concluded to be a long chain substance, presenting hydroxil and carbonil groups. All three compounds are presumed to be components of the cuticular wax. Chromatographie analysis showed three flavonoid glucosides which present the same aglycone, identified as quercetin by comparing its IR spectrum with that of an authentical sample. Through TLC, glucose, galactose and rhamnose were identified as the sugars linked to quercetin. Condensed tannins and traces of tartaric acid are also present.

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