Amaya Castro, PhD
León, Castilla y León, España
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As the lights of #Christmas surround our new WACKER House more and more, it is time to conclude the year 2024 by expressing my heartfelt gratitude.…
As the lights of #Christmas surround our new WACKER House more and more, it is time to conclude the year 2024 by expressing my heartfelt gratitude.…
Recomendado por Amaya Castro, PhD
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Gracias al equipo de #ObjetivoPlaneta por la oportunidad de compartir experiencias y hablar sobre la problemática de la contaminación por…
Gracias al equipo de #ObjetivoPlaneta por la oportunidad de compartir experiencias y hablar sobre la problemática de la contaminación por…
Recomendado por Amaya Castro, PhD
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Thank you very much for hosting us, Paleo! It was truly inspiring to visit your company and dive deeper into the work of another key player in the…
Thank you very much for hosting us, Paleo! It was truly inspiring to visit your company and dive deeper into the work of another key player in the…
Recomendado por Amaya Castro, PhD
Experiencia
Educación
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Universitat de Barcelona
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Publicaciones
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Podophyllotoxin and essential oil profile of Juniperus and related species
Industrial Crops and Products
Podophyllotoxin is currently in high demand as the lead chemical precursor for the anti-cancer drugs etoposide and teniposide. We conducted a two-phase study: (i) screening of Juniperus and other related species and identified Juniperus virginiana as the species with the highest podophyllotoxin concentration and (ii) established the limits of variations of podophyllotoxin and essential oil content and composition in J. virginiana in the United States. In the second phase of the study, J…
Podophyllotoxin is currently in high demand as the lead chemical precursor for the anti-cancer drugs etoposide and teniposide. We conducted a two-phase study: (i) screening of Juniperus and other related species and identified Juniperus virginiana as the species with the highest podophyllotoxin concentration and (ii) established the limits of variations of podophyllotoxin and essential oil content and composition in J. virginiana in the United States. In the second phase of the study, J. virginiana trees at 49 locations in Mississippi, Alabama, Tennessee, and North Dakota were sampled and analyzed for both podophyllotoxin and essential oil. Both the essential oil and podophyllotoxin had similar concentration ranges as percent of dry J. virginiana leaves. Hence the following qualitative grouping with respect to concentration of natural products in the leaves was assigned: very high (>0.3%), high (0.2–0.3%), medium (0.1–0.2%), and low (<0.1%). Based on the above qualitative grouping, the J. virginiana accession were divided into 10 different groups (chemotypes). The J. virginiana accessions also differed in essential oil composition, with wide variation of individual constituents. Based on the essential oil composition, the J. virginiana accessions were divided into different groups (chemotypes). The essential oil of two of the J. virginiana chemotypes showed differential antioxidant activity. J. virginiana leaves, a by-product from the timber industry could be used as a sustainable source for both podophyllotoxin and essential oil. The availability of various chemotypes offers an opportunity for the development of cultivars for commercial production of podophyllotoxin and essential oil with specific compositional profile to meet the market requirements.
Otros autoresVer publicación -
neo-Clerodane diterpenoids from Ajuga bracteosa
Journal of Natural Products
Different neo-clerodane diterpenoids were isolated
from a dichloromethane extract of Ajuga bracteosa depending
on the isolation procedure used, owing to the labile
nature of these tetrahydrofurofuran derivatives. Under “hydroxyl-
free” purification conditions, both clerodin- and dihydroclerodin-
type diterpenes were obtained [four new compounds,
ajubractins A-D, along with clerodin, 3-epi-caryoptin, ajugapitin, 14,15-dihydroclerodin, 3-epi-14,15-dihydrocaryoptin, ivain II, and…Different neo-clerodane diterpenoids were isolated
from a dichloromethane extract of Ajuga bracteosa depending
on the isolation procedure used, owing to the labile
nature of these tetrahydrofurofuran derivatives. Under “hydroxyl-
free” purification conditions, both clerodin- and dihydroclerodin-
type diterpenes were obtained [four new compounds,
ajubractins A-D, along with clerodin, 3-epi-caryoptin, ajugapitin, 14,15-dihydroclerodin, 3-epi-14,15-dihydrocaryoptin, ivain II, and 14,15-dihydroajugapitin. When methanol-water mixtures were used for a C18 reversed-phase prepurification procedure and for semipreparative HPLC, the new ajubractin E was also isolated. Epimeric (15R and 15S) mixtures were obtained instead of 14-hydro-15-hydroxyclerodin derivatives [15-hydroxyajubractin C, 14-hydro-15-hydroxyajugachin A,and 14-hydro-15-hydroxyajugapitin], along with 15-epi-lupulin B. The structures of the new compounds were elucidated by NMR and MS data analysis and by comparison with values previously reported. Antifeedant activity against Spodoptera littoralis larvae was evaluated for the compounds obtained.Otros autores -
LC-MS-SPE-NMR for the isolation and characterization of neo-clerodane diterpenoids from Teucrium luteum subsp. flavovirens
Journal of Natural Products 73 (5), pp. 962-965
neo-Clerodane diterpenes of plant origin are molecules difficult to monitor due to their nonspecific UV/vis absorption. The present work describes for the first time the application of the LC-MS-SPE-NMR technique for the isolation and characterization of three new neo-clerodane diterpenes, 3β-hydroxyteucroxylepin and teuluteumin A and teuluteumin B, from Teucrium luteum subsp. flavovirens, harvested from two different locations.
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Phytotoxic activity of flavonoids from Dicranostyles ampla
Natural Product Communications 5 (8), pp. 1233-1237
Crude extracts from over 16 species of plants from the family Convolvulaceae were evaluated for phytotoxic activity against Agrostis stolonifera (bentgrass) and Lactuca sativa (lettuce) at 1000 μg/mL. Ethanol extracts of Dicranostyles ampla Ducke were among the most active of those species tested. Systematic bioassay-guided fractionation of the ethanol extract of the aerial parts from this species was performed to identify specifically the phytotoxic compounds. Two phytotoxic flavonoids…
Crude extracts from over 16 species of plants from the family Convolvulaceae were evaluated for phytotoxic activity against Agrostis stolonifera (bentgrass) and Lactuca sativa (lettuce) at 1000 μg/mL. Ethanol extracts of Dicranostyles ampla Ducke were among the most active of those species tested. Systematic bioassay-guided fractionation of the ethanol extract of the aerial parts from this species was performed to identify specifically the phytotoxic compounds. Two phytotoxic flavonoids, dihydromyricetin (1) and myricetin-3-O-α-rhamnoside or myricetrin (2), were found to be responsible for much of the activity of the extract as a whole in the A. stolonifera and L. sativa bioassay. In a Lemna paucicostata bioassay, 1 and 2 had no activity at 100 μM.
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neo-Clerodane diterpenoids from Verbenaceae: Structural elucidation and biological activity
Natural Product Communications 3 (6), pp. 1021-1031
This reviews focuses on the occurrence and structural elucidation of neo-clerodane type diterpenes from Verbenaceae and the semisynthetic compounds of closely related structure obtained. Biological activities of crude extracts and isolated diterpenes will be briefly discussed.
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Phytoecdysteroids from Ajuga macrosperma var. breviflora roots
Journal of Natural Products 71 (7), pp. 1294-1296
Three new phytoecdysteroids, ajugacetalsterones C (1) and D (3) and breviflorasterone (2), were isolated from the roots of Ajuga macrosperma var. breviflora along with five known compounds, namely, 20-hydroxyecdysone, cyasterone, makisterone A, 20-hydroxyecdysone 3-acetate, and 20-hydroxyecdysone 2-acetate. The structures of 1-3 were elucidated on the basis of extensive 1D and 2D NMR spectroscopic studies. The new compounds possess acetal oxygen bridges between C-26 and C-20/C-22, or C-26/C-23,…
Three new phytoecdysteroids, ajugacetalsterones C (1) and D (3) and breviflorasterone (2), were isolated from the roots of Ajuga macrosperma var. breviflora along with five known compounds, namely, 20-hydroxyecdysone, cyasterone, makisterone A, 20-hydroxyecdysone 3-acetate, and 20-hydroxyecdysone 2-acetate. The structures of 1-3 were elucidated on the basis of extensive 1D and 2D NMR spectroscopic studies. The new compounds possess acetal oxygen bridges between C-26 and C-20/C-22, or C-26/C-23, or a lactone bridge between C-26 and C-23.
Más actividad de Amaya
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Just want to share something I recently shared: My son's future is my '#why'. My dad died of colo-rectal #cancer. My son and I are carriers of…
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Al hilo de esta noticia tengo especial interés en leer el informe que BACTHERA, así como sus accionistas LONZA y NOVONESIS harán del ejercicio 2024…
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Exciting non-science news! My husband Anthony Tordillos is running in the special election to represent District 3 in San José! He's a policy-centric…
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WACKER BIOSOLUTIONS under New Leadership +++ Mathias Wiedemann will take over as president of WACKER BIOSOLUTIONS on January 1, 2025. He succeeds…
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Seguramente no sea la mejor foto que se puede sacar, ni la edición es profesional, ni el ángulo o la luz,... pero eso hoy es lo de menos. Lo que…
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𝗜 𝗮𝗺 𝗰𝗲𝗹𝗲𝗯𝗿𝗮𝘁𝗶𝗻𝗴 𝟭𝟬 𝗜𝗻𝗰𝗿𝗲𝗱𝗶𝗯𝗹𝗲 𝗬𝗲𝗮𝗿𝘀 𝗮𝘁 Nextracker Inc. What an amazing journey it has been! I couldn’t have…
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🫱🏽🫲🏾 Gilead Sciences acquires AELIX Therapeutics investigational assets related to the HTI therapeutic #HIV vaccine. 💉 Developed from an…
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Proud to see how our little ‘baby’ has grow up and is now growing away ☺️ . #HTI was a novel concept for an HIV therapeutic vaccine, human-data…
Proud to see how our little ‘baby’ has grow up and is now growing away ☺️ . #HTI was a novel concept for an HIV therapeutic vaccine, human-data…
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At Levprot Bioscience, we’ve always known our ‘sugar baby’ was the sweetest (thanks to CNTA for helping us measure it last year!😉), but being…
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AND THE WINNER IS 🏆👏🥇..... This year's WACKER Net Zero Award honors outstanding sustainability projects by our employees. Our ambitious…
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Hoy he compartido mesa con Guardia Civil y FISCALIA GENERAL DEL ESTADO en las IV Jornadas #ToleranciaCero de Mutua Madrileña y Fundación ATRESMEDIA…
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Few weeks ago, I got to visit it... WACKER’s new, state-of-art mRNA Facility in beautiful Halle, Germany. YES, its Architecture blew me away… YES…
Few weeks ago, I got to visit it... WACKER’s new, state-of-art mRNA Facility in beautiful Halle, Germany. YES, its Architecture blew me away… YES…
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