Condensed tannins from roots of Indigofera stachyodes / 中国中药杂志

Eleven condensed tannins were isolated from the roots of Indigofera stachyodes by various column chromatography techniques including silica gel, octadecyl silica(ODS), Sephadex LH-20, and semi-preparative high performance liquid chromatography(HPLC). These compounds were identified on the basis of physicochemical properties, nuclear magnetic resonance(NMR) and mass spectrometry(MS) data as stachyotannin A(1), epicatechin-(2β→O→7,4β→8)-epiafzelechin-(4β→8)-catechin(2), cinnamtannin D1(3), cinnamtannin B1(4), epicatechin-(2β→O→7,4β→8)-epiafzelechin-(4α→8)-epicatechin(5), gambiriin C(6), proanthocyanidin A1(7), proanthocyanidin A2(8), aesculitannin B(9), proanthocyanidin A4(10), and procyanidin B5(11). Compound 1 is a new compound. Compounds 2-11 were isolated from Indigofera for the first time. Furthermore, compounds 1, 2, and 4-11 showed inhibitory effects on thrombin-induced ATP release in platelets.

Morphological alterations in salivary glands of mice (Mus musculus) submitted to tannin enriched diets: comparison with sialotrophic effects of sympathetic agonists stimulation / Alterações morfológicas das glândulas salivares de camundongos (Mus musculus) submetidos a dietas enriquecidas com taninos: comparação com os efeitos sialotróficos da estimulação com agonistas do sistema nervoso simpático

In order to study the effects of tannins at histomorphological level, mice were either fed with three structurally different types of tannins (tannic acid, chestnut, and quebracho) or treated with isoproterenol, during 10 days. Acini of parotid and submandibular glands increased significantly, being the increase higher for parotid compared to submandibular glands, and higher in the quebracho compared with the other tannin groups. Sublingual acinar size also increased after tannin consumption, by opposition to isoproterenol-treated animals. The results present evidences that the effects produced by tannins are dependent on their structure.

Estudaram-se as alterações morfológicas das glândulas salivares, induzidas por taninos, em camundongos. Os animais foram distribuídos em grupos e tratados com três diferentes tipos estruturais de taninos (ácido tânico, chestnut e quebracho - adicionados à ração) ou isoproterenol via intraperitoneal, durante 10 dias. Os ácinos das glândulas parótida e submandibulares aumentaram significativamente de tamanho, sendo o incremento maior para a parótida que para as submandibulares, e maior com o quebracho comparado com o provocado pelos outros taninos. Os ácinos das glândulas sublinguais também aumentaram após o consumo de taninos em relação aos ácinos dos animais tratados com isoproterenol. Os resultados apresentam evidências de que os efeitos produzidos pelos taninos dependem de sua estrutura.

Herbivory on bracken (Pteridium spp. ) by Bolax palliata Burmeister (Coleoptera: Scarabaeidae), a poliphagous beetle of the Venezuelan Andes / Herbivoría en el helecho macho (Pteridium spp. ) por Bolax palliata Burmeister (Coleoptera: Scarabaeidae), un escarabajo polífago de los Andes venezolanos

Herbivore attack by Bolax palliata Burmeister is reported on two sympatric bracken species: Pteridium caudatum (L.) Maxon and P. arachnoideum (Kaulf.). Laboratory and field observations revealed a preference for the last of the two species. Available phytochemical information suggests it could be based on differences in concentration of condensed tannins.

Se reporta la herbivoría de Bolax palliata Burmeister sobre dos especies simpátricas del helecho macho: Pteridium caudatum (L.) Maxon and P. arachnoideum (Kaulf.). Observaciones de laboratorio y campo mostraron preferencia por la última de estas especies. La información fitoquímica disponible sugiere que esta selección podría estar basada en diferencias en la concentración de taninos condensados.