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Bibliographic Details
Main Author:	Orfa J. Jiménez
Format:	Artículo científico
Language:	es
Published:	Universidad Nacional de Colombia 2007
Subjects:	Química pH CIE L antranoides temperatura colorantes naturales
Online Access:	https://www.redalyc.org/articulo.oa?id=309026672005
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CARACTERIZACIÓN DE LAS PROPIEDADES Y LA ESTABILIDAD DEL COLOR DE SOLUCIONES DE LOS ANTRANOIDES PRENILADOS FERRUGININA A Y y-HIDROXIFERRUGININA A Orfa J. Jiménez Erick A. Meneses Carlos M. García Diego L. Durango Química pH CIE L antranoides temperatura colorantes naturales Se evaluaron las propiedades del color y la estabilidad a diferentes factores (temperatu- ra y pH) de soluciones de los antranoides prenilados ferruginina A (FRA) y g-hidro- xiferruginina A (HFA), obtenidos a partir de las bayas de las especies Vismia guianensis y V. baccifera ssp. ferruginea. El estudio de la influencia de la temperatura sobre las características espectrales reveló que las soluciones en propilenglicol de la FRA y la HFA son relativamente estables al calor a las temperaturas de 50 y 80 °C, mientras que a 100 y 150 °C presentaron cambios ligeros en la intensidad (e) y tonalidad (lvis-max, coordenadas colorimétricas CIE L* a* b*). Adicionalmente, las variaciones del color (lvis-max, e) para los antranoides en el rango de pH 1,0-11,0 durante 60 días de almacenamiento a 4 y 25 °C, demostraron una mayor estabilidad del color en condiciones de refrigeración y pH 6,0 y 8,0, la cual fue superior para las soluciones de HFA. Las buenas características de los compuestos los hacen potencialmente útiles como colorantes naturales en la industria de los cosméticos, textil y farmacológica. 2007 artículo científico 0120-2804 https://www.redalyc.org/articulo.oa?id=309026672005 es http://www.redalyc.org/revista.oa?id=3090 Revista Colombiana de Química application/pdf Universidad Nacional de Colombia Revista Colombiana de Química (Colombia) Num.2 Vol.36

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// Anecdotal testing Today and Yesterday seems to indicate destroy() // is called by the garbage collector and everything is good. // Something to keep in mind though. return 0; } /** * Write function that is called when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ public function write($sessId, $data): bool { if ($this->writesDisabled) { return true; } return $this->saveSession($sessId, $data); } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ abstract protected function saveSession($sessId, $data): bool; }

* * @return void */ public function writeClose() { // The assumption is that we're using PHP's ext/session. // session_write_close() will actually overwrite $_SESSION with an // empty array on completion -- which leads to a mismatch between what // is in the storage object and $_SESSION. To get around this, we // temporarily reset $_SESSION to an array, and then re-link it to // the storage object. // // Additionally, while you _can_ write to $_SESSION following a // session_write_close() operation, no changes made to it will be // flushed to the session handler. As such, we now mark the storage // object isImmutable. $storage = $this->getStorage(); if (! $storage->isImmutable()) { $_SESSION = $storage->toArray(true); session_write_close(); $storage->fromArray($_SESSION); $storage->markImmutable(); } } /** * Attempt to set the session name * * If the session has already been started, or if the name provided fails * validation, an exception will be raised. * * @param string $name * @return SessionManager * @throws Exception\InvalidArgumentException */ public function setName($name) { if ($this->sessionExists()) { throw new Exception\InvalidArgumentException( 'Cannot set session name after a session has already started'

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