18/08/2009
CULTIVO, RECOLECCION Y ACONDICIONAMIENTO DE DROGAS.
FUENTES DE OBTENCION DE DROGAS El 50% de los fármacos comercializados son obtenidos de fuentes natura nat urales les (pr (prin incip cipio ios s act activo ivos s usa usados dos com como o tal tales es o mod modifi ificad cados os químicamente después de su extracción). Son tres las fuentes f uentes naturales principales principales de fármacos: f ármacos:
1.MUNDO TERRESTRE. 2.MUNDO MARINO. 3.METODOS BIOTECNOLOGICOS. a. CUL CULTIVO TIVO DE TEJIDOS. b. METODOS MICROBIOLOGICOS.
1
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18/08/2009
1. MUNDO TERRESTRE: es el que más participación tiene; el
reino vegetal más que el animal. Aun así, se considera que solo se ha estudiado farmacológicamente del 10 al 15% del total de las plantas existentes en la tierra.
2. MUNDO MARINO: muy importante para la obtención de principios activos novedosos porque la flora y muchos animales marinos están aún sin estudiar. Hay muchas sustancias (antibióticos, antiparasitarios, insecticidas, etc.) que se han descubierto muy recientemente, por lo que se considera que la flora y la fauna marina representa una alternativa farmacológica muy importante.
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18/08/2009
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18/08/2009
3. MET METODOS ODOS BIOTECN BIOTECNOLOGIC OLOGICOS: OS: Son métodos que consisten en la ob obte tenc nció ión n de fá fárm rmac acos os po porr cu cult ltiv ivo o de cé célu lula las s y te tejijido dos s vege geta talles o ani nima male les s, o me med dian ante te la ac acc ció ión n de cie iert rto os microorganismos.
Los s te tejijido dos s ve vege geta tale les s pu pued eden en a. CUL CULTI TIVO VO DE TE TEJI JIDO DOS: S: Lo vitro ro , lo que resulta beneficioso en la obtención cultivarse in vit específica de ciertos fármacos, si logra cultivarse el tejido que específicamente lo produce. De células y tejidos animales se obtienen principalmente hormonas, y de las células vegetales algunos alcaloides y aminoácidos.
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18/08/2009
b. METODOS MICROBIOLOGICOS: se usan hongos y bacterias; éstos sintetizan el principio activo, lo liberan al medio del cual se ex extra trae e po post ster erio iorm rmen ente te.. Lo Los s mi micr croo oorg rgan anis ismo mos s pu pued eden en producir los principios activos espontáneamente o pueden ser inducidos por técnicas de ingeniería genética. Se ha han n ob obte teni nido do ex exit itos osam amen ente te proteínas, vacunas, entre otros.
anti an tibi biót ótic icos os,,
alca al calo loid ides es,,
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18/08/2009
PROCEDENCIA DE LAS DROGAS VEGETALES.
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18/08/2009
PROCEDENCIA DE LAS PLANTAS MEDICINALES. PROCEDENCIA MEDICINALES. Las drogas vegetales pueden ser SILVESTRES o CULTIVADAS. Todas las plantas según su origen pueden clasificarse en:
1. ESPECIES AUTOCTONAS. Originarias de una zona, región o país determinado. 2. ESPECIES ALOCTONAS. Que son propias de otras zonas, regiones o países. Las alóctonas a su vez pueden ser: Plantas proc proceden edentes tes de 2.1. ESPECIES ACLIMA ACLIMATA TADAS. DAS. Plantas otros otr os lu lugar gares es que han sid sido o ad adapt aptada adas s a un una a reg región ión par partic ticul ular ar.. Pueden ser silvestres o cultivadas.
2.2. ESPE ESPECIES CIES EXOT EXOTICAS ICAS.. Plantas procedentes de otra zona geográfica que no crecen en una región determinada (salvo en condiciones especiales, como en un invernade invernadero). ro).
FLORA SILVESTRE COMO FUENTE DE DROGAS. Antiguamente todas las drogas vegetales eran silvestres, pero actualmente se prefieren las plantas cultivadas. El uso de plantas silvestres presenta multitud de inconvenientes: inconvenientes: 1. Baja producción.
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18/08/2009
FLORA SILVESTRE COMO FUENTE DE DROGA. El uso de plantas silvestres se recomienda cuando: 1. La población natural es abundante y de fácil acceso 2. La recolección es barata. 3. El cultivo es imposible 4. La demanda es muy baja.
FLORA CULTIVADA COMO FUENTE DE DROGAS: Actualmente casi todas las drogas se obtienen de plantas cultivadas, ya que permite la obtención ilimitada de droga y porque permite mejorar la calidad de la droga. La mejora puede deberse: a). A la posibilidad de recolectar las especies o variedades que poseen los caracteres deseados. b). Al mejor desarrollo de las plantas, debido al control del cultivo
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18/08/2009
VENTAJAS DEL CULTIVO DE DROGAS : a). Materia prima abundante, homogénea y de alta calidad. b). Co b). Cont ntro roll de va vari riab able les s qu que e pu pued eden en af afec ecta tarr al pr proc oces eso o de produc pro ducció ción, n, com como o las con condi dicio cione nes s cli climat matoló ológic gicas, as, nu nutri trient entes es,, plagas, tipo de suelo, riego, etc. c).Obtención de vegetales en igual estado de desarrollo.
DESVENTAJAS DEL CULTIVO DE DROGAS: a). Las plantas cultivadas son más frágiles que las espontáneas porque estas últimas se adaptan al entorno, pero las cultivadas puede que no tengan esa capacidad. b). Mayor vulnerabilidad al ataque de plagas. c). Hay que contar con periodos de descanso del suelo.
SIEMBRA O REPRODUCCION DE LAS DROGAS VEGETALES Las pl Las plan anta tas s pu pued eden en re repr prod oduc ucir irse se a pa part rtir ir de semillas o por medios vegetativos.
a). A PARTIR DE SEMILLAS: Muchas plantas se reproducen por semillas. Aquí, resulta importante:
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18/08/2009
Como mo ej ejem empl plos os de b). PO b). POR R ME MEDI DIOS OS VE VEGE GET TATI TIVO VOS: S: Co propagación vegetativa pueden mencionarse los siguientes:
1. Por el desarrollo de bulbos, tubérculos o rizomas. rizomas . 2. Por división. división. Se separan porciones de raíz con su correspondiente parte aérea y se replantan. 3. Por estolones. estolones . rama larga y delgada emitida en la base de un tallo o de un rizoma y que da lugar a raíces
4. Por esquejes . Tallos cortados de la planta entera, que adquieren la capacidad de echar raíces. 5. Por acodos Consiste en inducir a una rama con
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18/08/2009
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18/08/2009
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18/08/2009
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18/08/2009
RECOLECCION DE LAS DROGAS VEGETALES • Las drogas pueden ser reco re cole lecta ctada das s a pa part rtir ir de pl plan anta tas s silvestres o cultivadas. • Pu Pued ede e re real aliz izar arse se po porr pe pers rson onal al nativo, eventual e inexperto, o por trabajadores especiali especializados. zados. • Puede realizarse en forma manual o mecánica. • La ép époc oca a en qu que e se re reco cole lect cta a cada droga es impo importan rtante, te, pues puesto to que la cantidad y la naturaleza de los principios acti tiv vos no son constantes a lo largo del año
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18/08/2009
Las semillas cuando estén bien secas y comiencen a caer espontá esp ontánea neamente mente.. Si pro proced ceden en de frut frutos os muci mucilag laginos inosos, os, deben lavarse.
Las gomas, resinas y látex, deben recolectarse siempre en tiempo seco.
Las plantas con aceites esenciales deben recolectarse en la madrugada, recién salido el sol.
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18/08/2009
PROCESOS DE ACONDICIONAMIENTO ACONDICIONAMIENTO POST POST--COSECHA COSECHA DE LAS PLANTAS MEDICINALES PARA SU CONSERVACION. Estas etapas se realizan en una planta de procesamiento del material vegetal; esta debe permitir desarrollar el siguiente flujo de trabajo:
1. Corte o rebanado. 2. Lavado. 3. Desinfección y desinfestación. 4. Estabilización. 5. Secado. 6. Molido. 7. Almacenamiento.
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18/08/2009
3. De Desi sinf nfec ecci ción ón y de desin sinfe fest stac ació ión: n: Consiste en la elimi el imina naci ción ón de mi micr croo oorg rgan anis ismo mos s e inse insect ctos os,, ha hast sta a los los niveles establecidos por las normas.
• Tr Tratamien atamiento to con CO2 a presión. • Irradi Irradiación ación con rayo rayos s gamma. gamma. • Tr Tratamien atamiento to con óxido óxido de etileno. etileno.
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18/08/2009
6. PROCESO DE SECADO. Quita la humedad para asegurar una buena conservación, y el mantenimiento de la actividad y calidad de las drogas. El secado previene la acción de las enzimas, de las bacterias, los hongos y otros posibles cambios (oxidación). Fija los constituyentes, facilita el molido y reduce el peso; transforma la droga en un material de fácil comercio, transporte y almacenaje. El éxito del secado depende de dos principios fundamentales: el control de la temperatura, y el flujo de aire. El proceso de secado puede ser NATURAL (al sol o a la sombra), o ARTIFICIAL, ten tenie iendo ndo es este te ul ulti timo mo la ve vent ntaja aja de qu que e pe permi rmite te de dete tene nerr inmediatamente la actividad enzimática interna de las plantas.
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SECADO NA SECADO NATURAL. TURAL. Ut Util il Si se cue cuent nta a con con condi dici cione ones s climát climátic icas as adecuadas, baja humedad relativa y temperaturas elevadas; el secado natural requiere poco gasto y es sencillo de realizar. Es conveniente disponer las plantas en capas delgadas sobre catres o bandejas enrejilladas que se exponen al aire libre durante algunos días, teniendo la precaución de removerlas frecuentemente y de mantenerlas cubiertas o protegidas con alguna techumbre, durante el día para evitar la acci ac ción ón di direc recta ta del sol y, du dura rant nte e la no noche che par para a ev evit itar ar que el ro rocí cío o ennegrezca el producto. El tiempo de secado dependerá de las condiciones climáticas y de la naturaleza del material a secar.
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18/08/2009
De los métodos de secado artificial, el más utilizado es el que utiliza la aplicación de una corriente de aire caliente seco. seco . Al de dese seca carr un una a pl plan anta ta hú húme meda da co con n ai aire re ca calilien ente te,, el ai aire re qu que e aplicamos aporta el calor para la evaporación de la humedad y actúa como transporte para eliminar el vapor de agua que se forma en la cercanía de la superficie de evaporación.
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18/08/2009
b. SECADOR DE CABINA. Ese sen nci cia alm lme ente co con nsi sist ste e en una ca cab bina aisl slad ada a pro rov vist sta a interiormente de un ventilador para circular aire a través de un calentador; el aire caliente sale por una rejilla de láminas ajustables y es diri dirigido gido,, bien bien,, hori horizont zontalme almente nte entre bandejas bandejas carg cargadas adas de hierba, o bien, verticalmente a través de las bandejas perforadas y el producto.
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18/08/2009
d. SECADOR DE CINTA TRANSPORTADORA. TRANSPORTADORA. Es también un túnel de desecación pero el producto húmedo es conducido a través de una cinta transportadora que sustituye a las vagonetas.
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18/08/2009
8. ALMACENAMIENTO DE LAS DROGAS. Las condiciones de almacenamiento de las drogas dependen de cada especie y de la parte de la planta de que se trate, pero hay condiciones generales de almacenamiento:
ALMACE MACENAR NAR EN LUGA LUGAR R FRES FRESCO. CO. La te • AL tempe mpera ratu tura ra es un fac facto torr importante en la conservación de las drogas, ya que el calor produce