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Two new cytotoxic and virucidal trisulfated triterpene glycosides from the Antarctic sea cucumber Staurocucumis liouvillei.
Two new trisulfated triterpene glycosides, liouvillosides A and B, have been isolated from the Antarctic sea cucumber Staurocucumis liouvillei and were found to be virucidal against herpes simplex virus type 1 at concentrations below 10 microg/mL. Expand
Fatty acid composition of the edible sea cucumber Athyonidium chilensis
Results demonstrate for the first time that A. chilensis is a valuable food for human consumption in terms of fatty acids. Expand
Maize consumption in pre-Hispanic south-central Andes: chemical and microscopic evidence from organic residues in archaeological pottery from western Tinogasta (Catamarca, Argentina)
Abstract Pre-Hispanic Andean societies depended economically on the cultivation of maize (Zea mays), the main staple food crop in the region after its introduction from highland Mexico. Here weExpand
Synthesis and antiviral activity of sulfated and acetylated derivatives of 2β,3α-dihydroxy-5α-cholestane
The sulfated steroids 7 and 8 were the most effective in their inhibitory action against HSV-2, and the disulfated steroid 8 also proved to be active against DEN-2 and JV. Expand
Lichen Secondary Metabolites from the Cultured Lichen Mycobionts of Teloschistes chrysophthalmus and Ramalina celastri and their Antiviral Activities
Lichens and spore-derived cultured mycobionts of Teloschistes chrysophthalmus and Ramalina celastri were studied chemically, and results indicated that they produced, respectively, parietin and usnicExpand
Micro‐Raman spectroscopy of carbon‐based black pigments
Carbon-based black pigments are a wide group of dark-colored materials, which are classified according to the starting material used and their method of manufacture. Raman spectroscopy is an idealExpand
Antiproliferative, Cytotoxic and Hemolytic Activities of a Triterpene Glycoside from Psolus patagonicus and Its Desulfated Analog
Although glycosides 1 and 2 exert an antiproliferative effect, their mechanisms of action do not involve inhibition of NF-κB and more extensive studies are needed to establish a mechanism of action and to deduce a clear structure-activity relationship of sea cucumber triterpene glycoside. Expand
Identification of sulfated steroidal glycosides from the starfish Heliaster helianthus by electrospray ionization mass spectrometry
The starfish Heliaster helianthus contains Thornasteroside A (1) and Helianthoside (2) and its isomer (3) as the major sulfated steroidal glycosides. Saponin containing fractions obtained byExpand
Chemical analyses of the earliest pigment residues from the uttermost part of the planet (Beagle Channel region, Tierra del Fuego, Southern South America)
Abstract This paper presents the results of chemical analyses of the organic and inorganic fractions of pigment residues found in three archaeological sites located in the Beagle Channel region,Expand
A definitive analytical spectroscopic study of Indian yellow, an ancient pigment used for dating purposes.
Indian yellow identification was assured by 1H and 13C Nuclear Magnetic Resonance characterization and the complete assignment of the proton and carbon resonances was accomplished usingheteronuclear single quantum correlation (HSQC), heteronuclear multiple bond correlation (HMBC), nuclear overhauser effect spectroscopy (NOESY) and 1H-1H correlation spectroscope (COSY). Expand