Now showing items 1-20 of 56

    • Bridi, R.; Troncoso, M. J.; Folch Cano, Christian; Fuentes, J. Rodrigo; Speisky Cosoy, Hernán; López Alarcón, Camilo (Springer New York LLC, 2014)
      © 2014, Springer Science+Business Media New York. The use of a Folin–Ciocalteu (FC) assay to assess total phenolics in certain foods may be limited by the inability of this assay to discriminate between phenolics and ...
    • Pastene, Edgar; Gómez, Maritza; Speisky Cosoy, Hernán; Núñez Vergara, Luis (Sociedade Brasileira de Quimica, 2009)
      An apparatus which allows the direct measurement of the antioxidant capacity of volatiles compounds emitted from some herbs and culinary spices is described. The device comprises: a sample chamber, a mixing chamber, a pump ...
    • Suwalsky, Mario; Duguet, José; Speisky Cosoy, Hernán (Springer, 2017)
      The antioxidant and antihemolytic properties contained in the leaves of Buddleja globosa (B. globosa), also known as "Matico," were determined. Aqueous extracts of leaves were assayed in human erythrocytes and molecular ...
    • Ortiz, Rocío; Antilén, Mónica; Speisky Cosoy, Hernán; Aliaga, Margarita E.; López Alarcón, Camilo (2011)
      The analytical parameters of the microplatebased oxygen radicals absorbance capacity (ORAC) method using pyrogallol red (PGR) as probe (ORAC-PGR) are presented. In addition, the antioxidant capacity of commercial beverages, ...
    • Atala, E.; Aspée, Alexis; Speisky Cosoy, Hernán; Lissi Gervaso, Eduardo A.; López Alarcón, Camilo (2013)
      A novel ORAC (oxygen radical absorbance capacity) assay to assess antioxidant capacity of phenolic compounds in near-gastric conditions (pH 2.0) is presented. AAPH (2,2'-azo-bis(2-amidinopropane)dihydrochloride) was used ...
    • López Alarcón, Camilo; Speisky Cosoy, Hernán; Lissi Gervaso, Eduardo (Society of Biology of Chile, 2007)
      The antioxidant effect of 5-Aminosalicylic acid (5-ASA) on copper-mediated LDL oxidation was followed either by the emitted chemiluminiscence (CL) or by UV-vis spectroscopy. 5-ASA addition extends the lag phase in a ...
    • Speisky Cosoy, Hernán; Rocco, Claudia; Carrasco, Catalina; Lissi Gervaso, Eduardo A.; López Alarcón, Camilo (JOHN WILEY, 2006-06)
      Herbal tea consumption is deeply and widely rooted amongst South-American populations. In view of the involvement of oxygen- and nitrogen-reactive species in the ethiogenesis of several diseases, the antioxidant properties ...
    • Carrasco Pozo, Catalina; Gotteland, Martin; Speisky Cosoy, Hernán (2011)
      The aim of this work was to investigate the role of mitochondrial dysfunction in the development of oxidative stress and cytotoxicity induced by indomethacin and to evaluate the potential of an apple peel polyphenol extract ...
    • Ortiz, Rocío; Antilén, Mónica; Speisky Cosoy, Hernán; Aliaga, Margarita E.; López Alarcón, Camilo; Baugh, Steve (AOAC International, 2012)
      The method was approved by the Expert Review Panel on Strategic Foods Analytical Methods as First Action. See "Standards News," (2012) Inside Laboratory Management, March/April issue. The AOAC Stakeholder Panel on Strategic ...
    • Atala, E.; Vásquez, L.; Speisky Cosoy, Hernán; Lissi Gervaso, Eduardo A.; López Alarcón, Camilo (2009)
      An oxygen radical absorbance capacity (ORAC) method based on pyrogallol red bleaching (ORAC-PGR) was used to evaluate the scavenging activity of berry extracts (blackberry, blueberry, and raspberry). Among berry extracts, ...
    • Asencio, M.; Delaquerrière, B.; Cassels Niven, Bruce; Speisky Cosoy, Hernán; Comoy, E.; Protais, P. (1999)
      The aporphine alkaloids boldine and glaucine have been reported to show 'neuroleptic-like' actions in mice, suggesting that they may act as dopamine antagonists. We have found that in vitro boldine displaces specific ...
    • O'Brien, Peter; Carrasco Pozo, Catalina; Speisky Cosoy, Hernán (ELSEVIER, 2006-01-05)
      The increasing recognition of the participation of free radical-mediated oxidative events in the initiation and/or progression of cardiovascular, tumoural, inflammatory and neurodegenerative disorders, has given rise to ...
    • Speisky Cosoy, Hernán; Cassels Niven, Bruce (The Italian Pharmacological Society, 1993-06-02)
      Boldo (Peumus boldus Mol.), a Chilean tree traditionally employed in folk medicine and recognized as a herbal remedy in a number of pharmacopoeias, mainly for the treatment of liver ailments, has recently been the subject ...
    • Speisky Cosoy, Hernán; Cassels Niven, Bruce (1994)
      Boldo (Peumus boldus Mol.), a Chilean tree traditionally employed in folk medicine and recognized as a herbal remedy in a number of pharmacopoeias, mainly for the treatment of liver ailments, has recently been the subject ...
    • Henríquez, Carolina; Escobar Alvarez, Berta; Figuerola, Fernando; Chiffelle Gómez, Italo; Hernán Speisky; Ana María Estévez (ELSEVIER, 2008)
      Araucaria (Araucaria araucana) is a conifer tree, endemic of Chile. The seed of this tree, named pin˜on are composed principally of starch. In this work, pin˜on seeds and the starch isolated from them were evaluated. The ...
    • Méndez, Eduardo; Sanhueza, Julio; Speisky Cosoy, Hernán; Valenzuela Bonomo, Carlos (American Oil Chemists' Society, 1997)
      Two Rancimat evaluation modes, the induction period (IP), and the time needed to achieve a selected difference in conductivity (tΔK) were compared for assessing relative stability of anchovy sardine, and hake liver oils. ...
    • Muñoz Muñoz, Orlando; Copaja, Silvia; Speisky Cosoy, Hernán; Peña, Raúl C.; Montenegro, Gloria (Sociedade Brasileira de Quimica, 2007)
      A comparison of the phenolic content of several Chilean honeys showed great variations in flavonoid concentration among the samples analysed. Higher amounts of phenolics are found in honey from dry climates. The antioxidant ...
    • Olivares, Manuel; Pizarro Aguirre, Fernando; Speisky Cosoy, Hernán; Lönnerdal, Bo; Uauy Dagach-Imbarack, Ricardo (1998)
      Background: Copper is an essential nutrient for humans. Recently, a limit of 31.48 μmol/l (2 mg/l) was proposed by the World Health Organization as the provisional guideline value for copper content of drinking water. The ...
    • Speisky Cosoy, Hernán; Gómez, Maritza; Carrasco Pozo, Catalina; Pastene, Edgar; López Alarcón, Camilo; Olea Azar, Claudio (2008)
      Cu(2+) ions and and GSH molecules interact swiftly to form the complex Cu(I)–glutathione. We investigated the potential capacity of such complex to reduce molecular oxygen. The addition of SOD to a solution containing ...
    • Speisky Cosoy, Hernán; Gómez, Maritza; Carrasco Pozo, Catalina; Pastene, Edgar; López Alarcón, Camilo; Olea Azar, Claudio (PERGAMON-ELSEVIER SCIENCE LTD, 2008-07-01)
      Cu2+ ions and GSH molecules interact to swiftly form the complex Cu(I)–glutathione. We investigated the potential capacity of such complex to reduce molecular oxygen. The addition of SOD to a solution containing Cu(I)– ...