8 results on '"Victor H Ruiz"'
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2. Design, Physicochemical Characterization, and In Vitro Permeation of Innovative Resatorvid Topical Formulations for Targeted Skin Drug Delivery
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Victor H. Ruiz, David Encinas-Basurto, Bo Sun, Basanth Babu Eedara, Sally E. Dickinson, Georg T. Wondrak, H. -H. Sherry Chow, Clara Curiel-Lewandrowski, and Heidi M. Mansour
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resatorvid (TAK-242) ,nonmelanoma skin cancers ,topical drug delivery ,HaCaT human skin cell line ,NHEK normal primary human skin cells ,Strat-M synthetic membrane ,Pharmacy and materia medica ,RS1-441 - Abstract
Nonmelanoma skin cancers (NMSCs) are the most common malignancies worldwide and affect more than 5 million people in the United States every year. NMSC is directly linked to the excessive exposure of the skin to solar ultraviolet (UV) rays. The toll-like receptor 4 (TLR4) antagonist, resatorvid (TAK-242), is a novel prototype chemo preventive agent that suppresses the production of inflammation mediators induced by UV exposure. This study aimed to design and develop TAK-242 into topical formulations using FDA-approved excipients, including DermaBaseTM, PENcreamTM, polyethylene glycol (PEG)-400, propylene glycol (PG), carbomer gel, hyaluronic acid (HA) gel, and Pluronic® F-127 poloxamer triblock copolymer gel for the prevention of skin cancer. The physicochemical properties of raw TAK-242, which influence the compatibility and solubility in the selected base materials, were confirmed using X-ray powder diffraction (XRPD), differential scanning calorimetry (DSC), hot-stage microscopy (HSM), Raman spectroscopy, and attenuated total reflectance Fourier-transform infrared (ATR-FTIR) spectroscopic analysis. The permeation behavior of TAK-242 from the prepared formulations was determined using Strat-M® transdermal diffusion membranes, and 3D cultured primary human-derived epidermal keratinocytes (EpiDermTM). Despite TAK-242′s high molecular weight and hydrophobicity, it can permeate through reconstructed human epidermis from all formulations. The findings, reported for the first time in this study, emphasize the capabilities of the topical application of TAK-242 via these multiple innovative topical drug delivery formulation platforms.
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- 2022
- Full Text
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3. Innovative Rocuronium Bromide Topical Formulation for Targeted Skin Drug Delivery: Design, Comprehensive Characterization, In Vitro 2D/3D Human Cell Culture and Permeation
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Victor H. Ruiz, David Encinas-Basurto, Bo Sun, Basanth Babu Eedara, Eunmiri Roh, Neftali Ortega Alarcon, Clara Curiel-Lewandrowski, Ann M. Bode, and Heidi M. Mansour
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Inorganic Chemistry ,drug flux ,Franz cell diffusion system ,Strat-M® synthetic biomimetic membrane ,HaCaT human skin cell line ,NHEK human primary skin cells ,EpiDerm® 3D human skin tissue ,Organic Chemistry ,General Medicine ,Physical and Theoretical Chemistry ,Molecular Biology ,Spectroscopy ,Catalysis ,Computer Science Applications - Abstract
Cutaneous squamous cell carcinoma (cSCC) is the second-most common type of non-melanoma skin cancer and is linked to long-term exposure to ultraviolet (UV) radiation from the sun. Rocuronium bromide (RocBr) is an FDA-approved drug that targets p53-related protein kinase (PRPK) that inhibits the development of UV-induced cSCC. This study aimed to investigate the physicochemical properties and in vitro behavior of RocBr. Techniques such as thermal analysis, electron microscopy, spectroscopy and in vitro assays were used to characterize RocBr. A topical oil/water emulsion lotion formulation of RocBr was successfully developed and evaluated. The in vitro permeation behavior of RocBr from its lotion formulation was quantified with Strat-M® synthetic biomimetic membrane and EpiDerm™ 3D human skin tissue. Significant membrane retention of RocBr drug was evident and more retention was obtained with the lotion formulation compared with the solution. This is the first systematic and comprehensive study to report these findings.
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- 2023
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4. EVALUACION DE RIBERA Y HABITAT FLUVIAL A TRAVES DE LOS INDICES QBR E IHF ASSESSMENT OF A RIPARIAN AND FLUVIAL HABIT THROUGH QBR AND IHF INDEX
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Alejandro Palma, Ricardo Figueroa, and Víctor H Ruiz
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QBR ,IHF ,mediterráneo ,Chile ,mediterranean ,Oceanography ,GC1-1581 ,Zoology ,QL1-991 - Abstract
El desarrollo de métodos para evaluar de manera rápida y efectiva un sistema hidrográfico, pero sin perder la capacidad de integrar información de la salud del sistema, ha despertado un alto interés en el último tiempo. El presente estudio evaluó la condición ecológica de la parte alta del estero Ñonguen (primero cinco kilómetros) durante dos periodos estacionales, evaluando 5 transectos de 100 metros, separadas aproximadamente por un kilómetro. Para ello se aplicaron dos índices desarrollados para climas mediterráneos en la península ibérica: el índice de calidad de ribera (QBR) y el índice de habitat fluvial (IHF). Los resultados indican que estos índices entregan una aproximación confiable de la calidad de la ribera del río y del cauce mismo. Se discute sobre su adaptabilidad para sistemas fluviales en general.The development of methods that allow us to evaluate quickly and efficiently a freshwater system has been of high interest in the last time. This work evaluated the ecological condition of the headwater of the Ñonguen stream (first five kilometers) during two seasonal periods, evaluating 5 transect of 100 m. separate by one kilometers each other. Two indexes development to mediterranean climate in the Iberian Peninsula was appliqued: the QBR (to evaluate riparian quality) and IHF (to evaluate physical habitat) index. The results shows the efficiency of these indexes like rapid assessments of environmental quality to shows a first trustworthy approximation of the hydrological system. The application of these indexes to freshwater system in general are discuss.
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- 2009
5. CARACTERIZACION ECOLOGICA DE HUMEDALES DE LA ZONA SEMIARIDA EN CHILE CENTRAL WETLANDS ECOLOGICAL CHARACTERIZATION OF CENTRAL CHILE SEMI-DRY AREA
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Ricardo Figueroa, María Luisa Suarez, Asunción Andreu, Víctor H Ruiz, and María R Vidal -Abarca
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Chile Central ,ECELS ,Humedales ,macroinvertebrados ,peces ,Central Chile ,wetlands ,macroinvertebrates ,fishes ,Oceanography ,GC1-1581 ,Zoology ,QL1-991 - Abstract
Uno de los ecosistemas naturales más amenazados del planeta son los humedales, que a pesar de su reconocida importancia, son poco valorados, lo que cobra mayor relevancia en Chile donde existen muy poca información sobre este tipo de ambientes. Este trabajo reúne antecedentes sobre tipología, hidrología, usos del suelo, unidades paisajísticas e impactos de 20 humedales de las regiones IV y V (Coquimbo y Valparaíso, Chile Central). El período de muestreo abarcó del 2 al 10 de julio de 2007 correspondiente a la fase húmeda del ciclo hidrológico anual. Se analizaron distintos parámetros físico-químicos: profundidad, ancho de lámina de agua, tipología del sustrato, temperatura del agua, pH y conductividad; y biológicos: vegetación acuática y de ribera, macroinvertebrados y fauna piscícola. Finalmente, para determinar el estado de conservación de estos humedales se aplicó el índice del Estado de Conservación de Ecosistemas Lénticos Someros (ECELS), propuesto por la Agencia Catalana del Agua. En general se trata de ecosistemas de tamaño medio, no superior a 50 has, aunque el Complejo del Yali (región V) supera las 500 ha. La mayoría son permanentes, con valor medio de pH de 7.84 (rango = 7.1 y 9.4) y conductividad de 11918,16 uS/cm, pero con un rango muy amplio (entre 665 y 52200 uS/cm), lo cual muestra el distinto origen de las aguas que mantienen estos humedales. En cuanto a la vegetación acuática Ceratophyllum chilensis, es el macrófito más habitual, pero siempre en humedales de baja conductividad. La comunidad de invertebrados acuáticos está compuesta por 42 taxa pertenecientes a 29 familias. Los insectos es el grupo más diversificado (17 familias) y de ellos, los dípteros con 8 familias. En cuanto a la fauna piscícola, se recolectaron cuatro especies: la lisa (Mugil cephalus) de origen marino, y tres exóticas: gambusia (Gambusia holbrooki), gambusia manchada (Cnesterodon decemmaculatus), y chanchito (Cichlasomafacetum). La aplicación del ECELS evaluó sólo dos humedales de máxima calidad, 5 la calidad fue buena, en 7 fue media y en 6 mala (5) o muy mala (1).Wetlands are one of the most threatened natural ecosystems on the planet. In spite of their recognized importance, wetlands are not highly valued. This is particularly true in Chile, where little information is available regarding this type of environment. This paper presents data on the typology, hydrology, land uses, landscape units, and impact of 20 wetlands in regions IV (Coquimbo) and V (Valparaiso) of central Chile. Samples were taken from 2 to 10 July 2007, during the wet phase of the annual hydrological cycle. We analyzed a variety of physical-chemical (depth, width of the water surface, substrate typology, temperature, pH, water conductivity) and biological parameters (aquatic and shoreline vegetation, macroinvertebrates, ichthyic fauna). We used the Index of the State of Conservation of Shallow Lentic Ecosystems (ECELS), proposed by the Catalan Water Agency, to determine the state of conservation of these wetlands. In general, this index deals with mid-sized ecosystems that do not exceed 50 ha although, herein, the Yali complex (Region V) is an exception (>500 ha). Most of these systems are permanent and average 7,84 in pH (range = 7,1-9,4) and 11918,2 uS/cm in conductivity (range = 665-52200 uS/cm). The very wide range showed different origins of the waters that sustain these wetlands. As for the aquatic vegetation, Ceratophyllum chilensis is the most common macrophyte in low-conductivity wetlands. The aquatic invertebrate community is composed of 42 taxa belonging to 29 families. Insects constitute the most diverse group (17 families), particularly the dipterans (8 families). Four fish species were collected during sampling. One, flathead mullet or lisa (Mugil cephalus), has marine origins and the other three are exotic species: mosquito fish or gambusia (Gambusia holbrooki), ten spotted live-bearer (Cnesterodon decemmaculatus), and chameleon cichlid (Cichlasomafacetum). According to the ECELS, the quality of these wetlands is maximum in only two cases, good in five, regular in seven, poor in another five cases, and very poor in one case.
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- 2009
6. EL PEZ MESOPELAGICO CENTROLOPHUS NIGER (GMELIN, 1789) (PISCES: PERCIFORMES) Y SU HALLAZGO EN AGUAS DEL TALUD CONTINENTAL CHILENO SITUADAS SOBRE LA PLACA SUDAMERICANA MESOPELAGIC FISH CENTROLOPHUS NIGER (GMELIN, 1789) (PISCES: PERCIFORMES) RECORDED IN CHILEAN CONTINENTAL SLOPE WATERS OF SOUTH AMERICAN PLATE
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Pablo Reyes, Mathias Hüne, and Víctor H Ruiz
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Arrastre de media agua ,fauna acompañante ,Centrolophidae ,ictiofauna chilena ,Chile ,Midwater trawler fishing ,by catch ,Chilean ichthyofauna ,Oceanography ,GC1-1581 ,Zoology ,QL1-991 - Abstract
Se estudió un ejemplar de Centrolophus niger (Gmelin, 1789) (Perciformes: Centrolophidae), capturado como fauna acompañante en faenas de pesca de ``besugo'' Epigonus crassicaudus de Buen, 1959 el 14 de octubre del año 2003 frente a la provincia de Valdivia (39º04'S; 73º57'W) a una profundidad de 400 m, mediante pesca de arrastre de media agua. Este constituye el primer registro para la especie en aguas del talud continental chileno situadas sobre la Placa Sudamericana.A specimen of Centrolophus niger (Gmelin, 1789) (Perciformes: Centrolophidae), caught as by catch of the ``chilean cardenalfish'' Epigonus crassicaudus de Buen 1959, was studied. The specimen was caught on October 14, 2003, on the continental slope just off shore Valdivia Province (39º04'S;73º57'W), at 400 m deep, through midwater trawler fishing. This one is the southernmost record of this genus and species, being simultaneously the first record in Chilean continental slope waters of South American Plate, and the second record for the Chilean ichthyofauna
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- 2007
7. EFECTO ALELOPÁTICO DE LA FRACCIÓN CLOROFÓRMICA DE Lagascea mollis Cav. (ASTERACEAE) SOBRE LA GERMINACIÓN Y EL CRECIMIENTO RADICULAR DE Oryza sativa L ALLELOPATHY EFFECT OF A CHLOROFORMIC FRACTION OF Lagascea mollis Cav. (ASTERACEAE) ON THE GERMINATION AND ROOT GROWTH OF Oryza sativa L
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Elizabeth MURILLO P, Amparo VIÑA P, Víctor H RUÍZ T, and Carlos A PÉREZ C
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efecto alelopático ,arvense ,lagascea mollis ,oryza sativa ,asteraceae ,allelopathic effect ,weed ,Food processing and manufacture ,TP368-456 ,Pharmaceutical industry ,HD9665-9675 - Abstract
En este trabajo se presenta el estudio de la actividad alelopática de las lactonas terpénicas presentes en las fracciones clorofórmicas de Lagascea mollis Cav (Asteraceae). Para tal efecto se evalúa el porcentaje de semillas germinadas y la longitud de radícula de semillas de arroz (Oryza sativa L.). La bioactividad observada en las fracciones clorofórmicas es contrastada con la correspondiente en el extracto etanólico crudo. El mecanismo de interacción del metabolito se establece teniendo en cuenta el índice mitótico del meristema radicular, el estudio micromorfológico de la raíz y la conductividad del eflujo celular. Adicionalmente se caracteriza la arvense mediante su descripción morfológica y la determinación de los índices farmacognósticos. La investigación demuestra que los constituyentes químicos de las fracciones clorofórmicas de Lagascea mollis manifiestan efecto significativo sobre la división celular y el crecimiento radicular de Oryza sativa donde se observan alteraciones morfológicas, lo que evidencia la actividad alelopática de la arvense sobre el crecimiento de la gramínea.In this work, the study of the allelopathic activity of terpenic lactones on chloroformic fractions of Lagascea mollis Cav (Asteraceae) is reported. To this effect it is determined the percentage of germinated seeds and the radicular length of rice seeds (Oryza sativa L.). The observed bioactivity is contrasted with the corresponding one in the raw ethanolic extract. The mechanism of the metabolite interaction is established taking into account the mitotic index of the radicular meristeme, the micromorphologic study of the root and the conductivity of the cellular efflux. Additionally, the weed or arvense characterization is done by morphologic description and determination of pharmacognostic indexes. This research demonstrates that chemical constituents of the chloroformic fractions of Lagascea mollis manifest significant effect on cellular division and radicular growth of Oryza sativa where morphological alterations are observed, evidencing the allelopathic activity of the weed on the growth of the gramineous species.
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- 2005
8. Primer registro de Lampris guttatus (Pisces: Lamprididae) en el Golfo de Arauco, VIII Region, Chile First record of lampris guttatus (Pisces: Lamprididae) in the gulf of Arauco, VIII Region, Chile
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Víctor H Ruiz R and Ricardo Figueroa J
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Nuevo registro ,Lamprididae ,Lampris ,Golfo de Arauco ,Chile ,New record ,Gulf of Arauco ,Oceanography ,GC1-1581 ,Zoology ,QL1-991 - Abstract
Se registra por primera vez para el Golfo de Arauco la presencia del pez ``opah" Lampris guttatus (Brunnich,1788), sobre la base de la captura de dos ejemplares, durante los meses de agosto de 1991 y septiembre de 2001. El ejemplar de mayor tamaño (1360 mm de longitud total y 73 kilos) se encuentra depositado en la colección ictiológica del Museo Zoológico de la Universidad de Concepción (MZUC/UCCC), el segundo ejemplar mide 1.290 mm y alcanzó un peso de 70 kg. El análisis del contenido estomacal reveló la presencia de restos digeridos de peces, moluscos y crustáceos. Un intestino relativamente corto confirma su régimen de alimentación carnívora.Lampris guttatus (Brunnich, 1788) "opah" have been recorded in the Gulf of Arauco (Chile) after the captures of two specimens (August 1991 and September 2001). The first specimen weighed 73 kg with a total length of 1360 mm, the second, 70 kg and 1290 mm. The largest and heaviest specimen is deposited in the ictiological collection of the Zoological Museum of the University of Concepcion (MZUC/UCCC). The analysis of the stomach content revealed the presence of digested fishes, molluscs and crustaceans. Its relatively short intestine confirms its carnivorous diet.
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- 2006
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