{"id":1771,"date":"2017-02-21T10:50:46","date_gmt":"2017-02-21T08:50:46","guid":{"rendered":"https:\/\/www.fractioncollector.info\/?p=1771"},"modified":"2023-10-04T15:51:26","modified_gmt":"2023-10-04T13:51:26","slug":"isolamento-e-caracterizacao-de-compostos-alelopaticos","status":"publish","type":"post","link":"https:\/\/www.fractioncollector.info\/pt\/isolation-and-characterization-of-allelopathic-compounds\/","title":{"rendered":"Isolamento, purifica\u00e7\u00e3o e caracteriza\u00e7\u00e3o de compostos alelop\u00e1ticos"},"content":{"rendered":"

Isolamento e caracteriza\u00e7\u00e3o de compostos alelop\u00e1ticos por cromatografia em coluna e coletor de fra\u00e7\u00f5es LAMBDA OMNICOLL<\/span><\/strong><\/h1>\n<\/div><\/div><\/div><\/div><\/div>

Isolamento, elucida\u00e7\u00e3o estrutural e s\u00edntese qu\u00edmica de compostos alelop\u00e1ticos.<\/b> A identifica\u00e7\u00e3o de estruturas biol\u00f3gicas altamente potentes a partir de plantas, fungos e outros microrganismos \u00e9 um estudo extremamente trabalhoso e demorado. No entanto, essa identifica\u00e7\u00e3o representa um avan\u00e7o significativo. (utilizados como herbicidas naturais, medicamentos, antioxidantes, etc.)<\/i> Vale a pena o tempo e o esfor\u00e7o investidos.<\/p>\n

Um estudo de rotina sobre a an\u00e1lise estrutural de aleloqu\u00edmicos torna-se dif\u00edcil quando as estruturas n\u00e3o s\u00e3o identificadas no extrato bruto, mesmo ap\u00f3s v\u00e1rias etapas preliminares para realizar o fracionamento dos extratos brutos. (por macera\u00e7\u00e3o, extra\u00e7\u00e3o assistida por ultrassom ou micro-ondas, seguida de extra\u00e7\u00e3o aquosa bif\u00e1sica, etc.)<\/i>.<\/p>\n

O pesquisador ficar\u00e1 ent\u00e3o com um grande volume de solvente que pode conter uma mistura parcial de estruturas. (com ou sem atividades biol\u00f3gicas semelhantes)<\/i>. Atividade biol\u00f3gica<\/b> das estruturas podem ser identificadas por estudo e ensaios bioguiados<\/b>. Este grande volume de solvente deve ser dividido em fra\u00e7\u00f5es menores usando misturas de solventes com polaridades diferentes<\/b>. A coleta de fra\u00e7\u00f5es ajudar\u00e1 a isolar as mol\u00e9culas alelop\u00e1ticas mais ativas para a atividade biol\u00f3gica desejada\/alvo.<\/p>\n

Na maioria das vezes, o cromatografia em coluna l\u00edquida de gel de s\u00edlica<\/b> \u00e9 utilizado para o fracionamento dos extratos. No entanto, \u00e9 comum fracionar e coletar eluatos de cerca de 65 - 200 fra\u00e7\u00f5es<\/b>, a fim de alcan\u00e7ar o estrutura bioativa mais purificada em cada eluato<\/b>. A coleta manual de um grande n\u00famero de fra\u00e7\u00f5es \u00e9 a fase que consome mais tempo e esfor\u00e7o em um projeto de pesquisa geral, devido ao alto custo dos coletores de fra\u00e7\u00f5es espectrofotom\u00e9tricos dispon\u00edveis no mercado.<\/p>\n

Etapas adicionais de purifica\u00e7\u00e3o incluem Cromatografia em camada fina, ensaios bioativos, cromatografias preparativas em coluna <\/b>etc. e, finalmente, uma lista de ensaios espectrom\u00e9tricos<\/b> para as estruturas altamente ativas, a fim de elucidar e viabilizar sua s\u00edntese qu\u00edmica no futuro.<\/p>\n

O A coleta de 200 fra\u00e7\u00f5es ou mais pode ser facilmente automatizada.<\/b> da maneira mais vi\u00e1vel (se o adequado) coletor de fra\u00e7\u00f5es<\/a> \u00e9 escolhido!)<\/em>.<\/p>\n<\/div><\/div><\/div>

\"\"<\/a>

Isolamento e purifica\u00e7\u00e3o de compostos alelop\u00e1ticos utilizando cromatografia em coluna de s\u00edlica gel, fra\u00e7\u00f5es coletadas ao longo do tempo por um coletor de fra\u00e7\u00f5es OMNICOLL e cromatografia em camada fina (CCF). Os compostos purificados podem ser caracterizados por meio de estudos espectrosc\u00f3picos de UV, IR, LC-MS e RMN.<\/p><\/div><\/p>\n<\/div><\/div><\/div><\/div>

Fracionamento do extrato bruto<\/h2>\n

Inicialmente, os extratos brutos s\u00e3o separados em v\u00e1rias fra\u00e7\u00f5es discretas contendo compostos de polaridades ou tamanhos moleculares semelhantes por meio de cromatografia em coluna<\/b>. Nessa separa\u00e7\u00e3o cromatogr\u00e1fica, aproximadamente Foram coletadas 65 fra\u00e7\u00f5es de 20 mL cada.<\/b> (com base no tempo) pelo coletor de fra\u00e7\u00f5es<\/b> \u00d4NICO.<\/p>\n<\/div><\/div><\/div><\/div>

Cromatografia em camada fina (CCF)<\/h2>\n

Uma al\u00edquota de todas as fra\u00e7\u00f5es coletadas foi aplicada em placas de cromatografia em camada fina (CCF) de s\u00edlica gel ativada (20 x 20 cm). As fra\u00e7\u00f5es foram agrupadas com base em padr\u00e3o de manchas e valores de Rf<\/b> na placa de TLC. As fra\u00e7\u00f5es agrupadas foram numeradas (Fr.1 - Fr.8).<\/p>\n<\/div><\/div><\/div><\/div>

Cromatografia preparativa em coluna TLC ou HPLC<\/h2>\n

As fra\u00e7\u00f5es (Fr.1 - Fr.8) podem ser purificadas posteriormente por cromatografia preparativa em coluna TLC e\/ou HPLC<\/b>. A HPLC preparativa ajudar\u00e1 a isolar um composto espec\u00edfico com maior precis\u00e3o.<\/p>\n<\/div><\/div><\/div><\/div>

Caracteriza\u00e7\u00e3o dos compostos alelop\u00e1ticos<\/h2>\n

As fra\u00e7\u00f5es puras isoladas s\u00e3o ent\u00e3o utilizadas para a determina\u00e7\u00e3o da estrutura e tamb\u00e9m para verificar mais uma vez a atividade biol\u00f3gica.<\/p>\n

A caracteriza\u00e7\u00e3o dos compostos alelop\u00e1ticos puros \u00e9 feita por alta resolu\u00e7\u00e3o. IR, MS, 1<\/sup>M\u00e3o 13<\/sup>RMN de 13C <\/b>espectros.<\/p>\n

Os espectros de infravermelho s\u00e3o usados para identificar os grupos funcionais da fra\u00e7\u00e3o pura isolada. A LC-MS fornece a massa molecular, seja emp\u00edrica ou exata (HRMS), e os espectros de RMN revelam os ambientes de carbono e hidrog\u00eanio. A an\u00e1lise por LC-MS auxilia na compara\u00e7\u00e3o dos padr\u00f5es de massa.<\/p>\n<\/div><\/div><\/div><\/div><\/div>","protected":false},"excerpt":{"rendered":"

Isolation and characterization of allelopathic compounds by column chromatography and fraction collector LAMBDA OMNICOLL Isolation, structural elucidation and chemical synthesis of allelopathic compounds from plants, fungi, and other microorganisms are a very labor-exhausting and time-consuming studies. However, the identification of highly potent biological structures (used as natural herbicides, medicaments, antioxidants, etc.) is worth the time […]<\/p>\n","protected":false},"author":2,"featured_media":1789,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"ai_generated_summary":"","footnotes":""},"categories":[132,4],"tags":[135,134,6,136,133],"class_list":["post-1771","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-post-name","category-omnicoll","tag-allelopathic-compounds","tag-chemical-synthesis","tag-fraction-collector","tag-liquid-column-chromatography","tag-structural-elucidation","post-with-thumbnail","post-with-thumbnail-icon"],"yoast_head":"\nIsolation, purification and characterization of allelopathic compounds – LAMBDA OMNICOLL | LAMBDA Laboratory Instruments<\/title>\n<meta name=\"description\" content=\"Isolation of allelopathic compounds with silica gel column 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