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Ultrahigh-Performance Liquid Chromatography-High-Resolution Quadrupole Time-of-Flight Mass Spectrometry Based Metabolomics Reveals Key Differences between Brachiaria decumbens and B. brizantha, Two…

• Andy J Pérez, Syeda M Hussain, Łukasz Pecio, Mariusz Kowalczyk, Valdo Rodrigues Herling, Anna Stochmal
• Journal of agricultural and food chemistry
• 2016

Several species of Brachiaria (Poaceae) currently cover extensive grazing areas in Brazil, providing valuable source of feed for a large cattle population. However, numerous cases of toxicity… (More)

Phytotoxic steroidal saponins from Agave offoyana leaves.

• Andy J Pérez, Ana María Simonet, +4 authors Francisco A Macías
• Phytochemistry
• 2014

A bioassay-guided fractionation of Agave offoyana leaves led to the isolation of five steroidal saponins (1-5) along with six known saponins (6-11). The compounds were identified as… (More)

Isolation and structural determination of triterpenoid glycosides from the aerial parts of alsike clover (Trifolium hybridum L.).

• Andy J Pérez, Mariusz Kowalczyk, Ana María Simonet, Francisco A Macías, Wiesław Oleszek, Anna Stochmal
• Journal of agricultural and food chemistry
• 2013

Five azukisapogenol glycosides (1-5) have been isolated from the aerial parts of alsike clover (Trifolium hybridum L.), and their structures were elucidated by combined spectroscopic, spectrometric… (More)

Characterization of three saponins from a fraction using 1D DOSY as a solvent signal suppression tool. Agabrittonosides E-F. Furostane saponins from Agave brittoniana Trel. spp. Brachypus.

• Francisco A Macías, José Orestes Guerra, Ana María Simonet, Andy J Pérez, Clara M Nogueiras
• Magnetic resonance in chemistry : MRC
• 2010

A careful NMR analysis, especially by 1D TOCSY and 1D ROESY, of a refined saponin fraction allowed us to determine the structure of three saponins from a polar extract of Agave brittoniana Trel. spp.… (More)

Triterpenoid Components from Oak Heartwood (Quercus robur) and Their Potential Health Benefits.

• Andy J Pérez, Łukasz Pecio, +6 authors Anna Stochmal
• Journal of agricultural and food chemistry
• 2017

For centuries oak wood (Quercus robur) has been used in aging of wines and spirits, which is based on pleasant flavors given to beverages by phenolics transferred to the liquid during the maturation… (More)

Cytotoxic triterpenoids isolated from sweet chestnut heartwood (Castanea sativa) and their health benefits implication.

• Andy J Pérez, Łukasz Pecio, +6 authors Wiesław Oleszek
• Food and chemical toxicology : an international…
• 2017

For centuries wood containers have been used in aging of wines and spirits, due to the pleasant flavors they give to the beverages. Together with oak, sweet chestnut wood (Castanea sativa) have been… (More)

Fingerprinting of strong spermatogenesis steroidal saponins in male flowers of Phoenix dactylifera (Date Palm) by LC-ESI-MS.

• Arafa I Hamed, Ridha Ben Said, +6 authors Anna Stochmal
• Natural product research
• 2017

A fingerprint of steroid saponins, the major constituent in 80% methanolic fraction from the male flowers of Phoenix dactylifera has been established. Under ESI-MS/MS conditions, the fragmentation… (More)

Bioactive steroidal saponins from Agave offoyana flowers.

• Andy J Pérez, Juan M Calle, Ana María Simonet, José Orestes Guerra, Anna Stochmal, Francisco A Macías
• Phytochemistry
• 2013

Bioguided studies of flowers of Agave offoyana allowed the isolation of five steroidal saponins never described previously, Magueyosides A-E (1-5), along with six known steroidal saponins (6-11). The… (More)

Steroidal Saponins from Furcraea hexapetala Leaves and Their Phytotoxic Activity.

• Juan M Calle, Andy J Pérez, Ana María Simonet, José Orestes Guerra, Francisco A Macías
• Journal of natural products
• 2016

Four new steroidal saponins (1-4) along with 13 known saponins were isolated from the leaves of Furcraea hexapetala. The new compounds were identified as (20R,22R,25R)-3β-hydroxy-5α-spirostan-12-one… (More)

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