Notes breus (flora). Nasella neesiana (Trin. & Rupr.) Barkworth and N. mucronata (Kunth) R.W. Pohl in Barkworth dues gramínies al·lòctones noves a Catalunya

Nota breu de flora que fa referència a la presència al NE del Principat de dues espècies noves de Nasella (N. neesiana i N. Mucronata), originàries de l’ Amèrica del Sud

Constituintes químicos de Hyptidendron canum (Pohl ex Benth.) R. Harley (Lamiaceae)

Chemical investigation of Hyptidendron canum stems resulted in the isolation of betulinic, ursolic and euscaphic acids. From the leaves were isolated 3β-O-β-galactopiranosilsitosterol, ursolic aldehyde, and mixtures of maslinic acid and 2α-hydroxyursolic acid, α and β-amyrin, uvaol and erythrodiol, sitosterol and stigmasterol, spathulenol and globulol. Hexane and chloroform leave fractions as well as ursolic and betulinic acids showed antifungal activities against the yeast form of Paracoccidioides brasiliensis.

Constituintes químicos das cascas do caule de Vochysia thyrsoidea Pohl. (Vochysiaceae) e avaliação das atividades citotóxica e inibitória frente as catepsinas B e K

A new flavonoid, catechin-3-O-(3"-O-trans-cinnamoyl)-α-rhamnopyranoside, along with known compounds, catechin-3-O-α-rhamnopyranoside, 3-oxo-urs-12-en-28-oic acid, 2,4,6-trimethoxybenzoic acid, 2-butyl-D-fructofuranoside and 1-butyl-D-fructofuranoside, has been isolated from the stem bark of V. thyrsoidea. These compounds were assayed for inhibition of protease activity (cathepsins B and K) and against cancer cell lines. Catechin-3-O-(3"-O-trans-cinnamoyl)-α-rhamnopyranoside showed moderate inhibitory activity (IC50 = 62.02 µM) against cathepsin B while 2-butyl-D-fructofuranoside was the most potent against a strain of CNS (SF-295) and human leukemia (HL-60) with IC50 = 36.80 µM and IC50 = 25.37 µM, respectively.

Terpenoides e cumarinas de Jatropha ribifolia (Pohl) Baill

Eight compounds, including terpenoids (jatrophone, hydroxyjatrophone, 6-hydroxycyperene, cabraleadiol monoacetyl, and cabraleadiol) and coumarins (fraxetin, fraxidin, and isofraxidin), were isolated from Jatropha ribifolia (Euphorbiaceae). Their structures were established by 1D and 2D NMR (COSY, HSQC, and HMBC) spectra, HRESIMS and comparison with published data.

Peter Piper

Ei vapaa, vapautuu 2027. Kosti Vehanen (1887-1957).