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At least 109 records · Page 6Linked to original sources
PubMed1997

[Essential oil components in leaves and stems of Piper bisasperatum (Piperaceae)].

The composition of the essential oils of the leaves and spikes of Piper bisasperatum Trel. (Piperaceae) obtained by hydrodistillation were investigated by GC-MS. The main constituents of the leaves oil were the sesquiterpenes germacrene D (30.7%), beta-caryophyllene (9.5%) and gamma-elemene (5.9%), together with the monoterpene beta-pinene (5.5%). The main constituents of the spikes (flowers and fruits) were the monoterpenes beta-pinene (17.5%), alpha-pinene (14.0%) and the sesquiterpenes germacrene D (19.5%), beta-caryophyllene (7.9%) and ylangene (7.6%). The C6-C1 compounds benzyl benzoate (0.3%) and benzaldehyde (< 0.1%) were identified for the first time in the genus Piper.

Costa Rica↗
PubMedDate not supplied

Correlation between disintegration, dissolution and in vivo absorption rate in the case of compounds with benzyl-isoquinoline structures and its pharmacokinetic aspects.

Investigations have proved that in the case of po preparations disintegration time, dissolution rate and in vivo absorption rate are closely interrelated. These correlations described by adequate mathematical formulas are valid in the case of papaverine, drotaverine and Depogen--compounds with benzyl-isoquinoline structure.

Absorption↗
PubMed2003

Benzylation of aromatic compounds with different crystallites of MgO.

Magnesium oxide nanocrystals are shown to be selective catalysts for the benzylation of aromatics with benzyl chloride, in the order xylene > toluene >> benzene. Normal polycrystalline MgO is not as effective as the nanomaterials. However, at the highest surface area, normally most reactive MgO samples (aerogel prepared AP-MgO) were poorer catalysts than a hexagonal platelet form (CP-MgO) of lower surface area. During the catalysis, the MgO is partially converted to MgCl(2), but crystal shape differences are not washed out. Rate data, differential thermal analysis, and consideration of crystal shapes and faces suggest that the CP-MgO form is most catalytically active because of optimal adsorption, molecular trafficking, and desorption energies. The AP-MgO apparently adsorbs the reactants too strongly, and thereby this hinders the catalytic process. These results serve as another example of where nanocrystalline shape plays an important role.

Journal Article↗