2 research outputs found
A new depigmenting-antifungal methylated grindelane from Grindelia chiloensis
The new methylated grindelane diterpenoid, 7ÎČâhydroxyâ8(17)âdehydrogrindelic acid (1b), together with the known 7αâhydroxyâ8(17)âdehydrogrindelic acid (2a), 6âoxogrindelic acid (3a), 4ÎČâhydroxyâ6âoxoâ19ânorgrindelic (4a), 19âhydroxygrindelic acid (5a), 18âhydroxygrindelic acid (6a), 4αâcarboxygrindelic acid (7a), 17âhydroxygrindelic acid (8a), 6αâhydroxygrindelic acid (9a), 8,17âbisnorâ8âoxagrindelic acid (10a), 7α,8αâepoxygrindelic acid (11a), and strictanonic acid (12a) as methyl esters were obtained from an Argentine collection of Grindelia chiloensis (Cornel.) Cabrera. Their structures and relative configurations were established on the basis of spectroscopic analysis. CHCl3 extract from the aerial parts and their pure compounds were evaluated for their antifungal and depigmenting effects. Methyl ester derivative of 10a (10b) exhibited a remarkable mycelial growth inhibition against Botritis cinerea with an IC50 of 13.5 ÎŒg mlâ1. While the new grindelane 1b exerted a clear color reduction of the yellowâorange pigment developed by Fusarium oxysporum against UVâinduced damage.Fil: Mesurado, Maria de los Angeles. Universidad Nacional de TucumĂĄn. Facultad de BioquĂmica, QuĂmica y Farmacia. Instituto de QuĂmica OrgĂĄnica; ArgentinaFil: Arias CassarĂĄ, MarĂa Lucrecia. Universidad Nacional de TucumĂĄn. Facultad de BioquĂmica, QuĂmica y Farmacia. Instituto de QuĂmica OrgĂĄnica; Argentina. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas; ArgentinaFil: Misico, Rosana Isabel. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Oficina de CoordinaciĂłn Administrativa Ciudad Universitaria. Unidad de MicroanĂĄlisis y MĂ©todos FĂsicos en QuĂmica OrgĂĄnica. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Unidad de MicroanĂĄlisis y MĂ©todos FĂsicos en QuĂmica OrgĂĄnica; ArgentinaFil: Bardon, Alicia del Valle. Universidad Nacional de TucumĂĄn. Facultad de BioquĂmica, QuĂmica y Farmacia. Instituto de QuĂmica OrgĂĄnica; Argentina. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas; ArgentinaFil: Ybarra, MarĂa InĂ©s. Universidad Nacional de TucumĂĄn. Facultad de BioquĂmica, QuĂmica y Farmacia. Instituto de QuĂmica OrgĂĄnica; ArgentinaFil: Cartagena, Elena. Universidad Nacional de TucumĂĄn. Facultad de BioquĂmica, QuĂmica y Farmacia. Instituto de QuĂmica OrgĂĄnica; Argentin
A new depigmenting-antifungal methylated grindelane from Grindelia chiloensis
The new methylated grindelane diterpenoid, 7ÎČâhydroxyâ8(17)âdehydrogrindelic acid (1b), together with the known 7αâhydroxyâ8(17)âdehydrogrindelic acid (2a), 6âoxogrindelic acid (3a), 4ÎČâhydroxyâ6âoxoâ19ânorgrindelic (4a), 19âhydroxygrindelic acid (5a), 18âhydroxygrindelic acid (6a), 4αâcarboxygrindelic acid (7a), 17âhydroxygrindelic acid (8a), 6αâhydroxygrindelic acid (9a), 8,17âbisnorâ8âoxagrindelic acid (10a), 7α,8αâepoxygrindelic acid (11a), and strictanonic acid (12a) as methyl esters were obtained from an Argentine collection of Grindelia chiloensis (Cornel.) Cabrera. Their structures and relative configurations were established on the basis of spectroscopic analysis. CHCl3 extract from the aerial parts and their pure compounds were evaluated for their antifungal and depigmenting effects. Methyl ester derivative of 10a (10b) exhibited a remarkable mycelial growth inhibition against Botritis cinerea with an IC50 of 13.5 ÎŒg mlâ1. While the new grindelane 1b exerted a clear color reduction of the yellowâorange pigment developed by Fusarium oxysporum against UVâinduced damage.Fil: Mesurado, Maria de los Angeles. Universidad Nacional de TucumĂĄn. Facultad de BioquĂmica, QuĂmica y Farmacia. Instituto de QuĂmica OrgĂĄnica; ArgentinaFil: Arias CassarĂĄ, MarĂa Lucrecia. Universidad Nacional de TucumĂĄn. Facultad de BioquĂmica, QuĂmica y Farmacia. Instituto de QuĂmica OrgĂĄnica; Argentina. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas; ArgentinaFil: Misico, Rosana Isabel. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Oficina de CoordinaciĂłn Administrativa Ciudad Universitaria. Unidad de MicroanĂĄlisis y MĂ©todos FĂsicos en QuĂmica OrgĂĄnica. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Unidad de MicroanĂĄlisis y MĂ©todos FĂsicos en QuĂmica OrgĂĄnica; ArgentinaFil: Bardon, Alicia del Valle. Universidad Nacional de TucumĂĄn. Facultad de BioquĂmica, QuĂmica y Farmacia. Instituto de QuĂmica OrgĂĄnica; Argentina. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas; ArgentinaFil: Ybarra, MarĂa InĂ©s. Universidad Nacional de TucumĂĄn. Facultad de BioquĂmica, QuĂmica y Farmacia. Instituto de QuĂmica OrgĂĄnica; ArgentinaFil: Cartagena, Elena. Universidad Nacional de TucumĂĄn. Facultad de BioquĂmica, QuĂmica y Farmacia. Instituto de QuĂmica OrgĂĄnica; Argentin