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1.
J Chromatogr Sci ; 50(8): 666-72, 2012 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-22595260

RESUMO

This paper describes the determination of fatty acid composition of coffee, citrus and rum distillery wastes using reversed-phase high-performance liquid chromatography (RP-HPLC). Lipid extracts of the waste samples are derivatized with phenacyl bromide and their phenacyl esters are separated on a C8 reversed-phase column by using continuous gradient elution with water and acetonitrile. The presence of saturated and unsaturated fatty acids in quantifiable amounts in the examined wastes, as well as the high percentage recoveries, are clear indications that these wastes have potential value as inexpensive sources of lipids. The HPLC procedures described here could be adopted for further analysis of materials of this nature.


Assuntos
Acetofenonas/química , Agricultura , Cromatografia Líquida de Alta Pressão/instrumentação , Cromatografia Líquida de Alta Pressão/métodos , Ácidos Graxos/análise , Resíduos Industriais/análise , Bebidas Alcoólicas , Citrus , Café , Jamaica
2.
J Chromatogr Sci ; 47(8): 674-80, 2009 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-19772744

RESUMO

Jamaican agro-industries generate large quantities of wastes, which are either discarded or under-utilized. In order to evaluate the possible utilization of these wastes, it is necessary that the profiles of the major biochemical groups be developed. This paper describes the determination of the amino acid composition of coffee, citrus, and rum distillery wastes using a reversed-phase high-performance liquid chromatography method. Acid hydrolysates of the wastes are derivatized with phenylisothiocyanate. They are analyzed as their phenylthiocarbamyl derivatives and determined quantitatively using norleucine as the internal standard. The presence of all the 17 amino acids investigated, nine of which include those essential for animal nutrition, are observed in the samples investigated, suggesting a high quality of protein with implications in the formulation of animal feeds.


Assuntos
Agricultura , Aminoácidos/análise , Aminoácidos/química , Cromatografia Líquida de Alta Pressão/métodos , Resíduos Industriais/análise , Isotiocianatos/química , Jamaica
3.
West Indian med. j ; 56(6): 487-490, Dec. 2007. tab
Artigo em Inglês | LILACS | ID: lil-507260

RESUMO

Mixed lymphocyte responses assays were conducted at 25.0 and 250.0 microg/mL of the crude ethanolic extract of Boehmeria jamaicensis Urb (coded as BJE) using peripheral lymphocytes obtained from individuals suffering from the common cold after four days of infection and from healthy individuals (without the common cold infection). At a concentration of 25 ug/mL, gamma interferon (IFN-gamma) was increased by 24.03 fold and interleukin 4 (IL-4) by 1.71 fold for the cells obtained from individuals with the common cold (Group A). The extract suppressed IFN-gamma by 8.3% while IL-4 was stimulated by 9.90 fold from peripheral lymphocytes obtained from healthy individuals (Group B). Gamma interferon was suppressed at 250 microg/mL while IL-4 was elevated by 1.86 fold for cells obtained from individuals suffering from the common cold (Group A). In conclusion, BJE could have implications for the treatment of the common cold.


Ensayos de reacci¨®n linfocitaria mixta fueron realizados a 25.0 y 250.0 ¦Ìg/mL de extracto etan¨®lico crudo de Boehmeria jamaicensis Urb (codificado como BJE), usando linfocitos perif¨¦ricos obtenidos de individuos con catarro com¨²n luego de cuatro d¨ªas de infecci¨®n, y de individuos sanos (sin la infecci¨®n del catarro com¨²n). Se hall¨® que el interfer¨®n-gamma (IFN-¦Ã) aument¨® en 24.03 veces, y la interleucina 4 (IL-4) en 1.71 veces para las c¨¦lulas obtenidas de individuos con catarro com¨²n, a 25¦Ìg/mL. El extracto inhibi¨® IFN-¦Ã en un 8.3 % en tanto que el IL-4 fue estimulado en 9.90 veces a partirde los linfocitos perif¨¦ricos obtenidos de individuos sanos. El gamma-interfer¨®n fue inhibido a 250 ¦Ìg/mL, mientras que la IL-4 se elev¨® en 1.86 veces para las c¨¦lulas obtenidas de individuos que sufren de catarro com¨²n.


Assuntos
Humanos , Boehmeria , Fitoterapia/métodos , Interferon gama/imunologia , /imunologia , Resfriado Comum/imunologia , Resfriado Comum/terapia , Sinusite/imunologia , Sinusite/terapia , Sinusite/microbiologia
4.
West Indian Med J ; 56(6): 487-90, 2007 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-18646490

RESUMO

Mixed lymphocyte responses assays were conducted at 25.0 and 250.0 microg/mL of the crude ethanolic extract of Boehmeria jamaicensis Urb (coded as BJE) using peripheral lymphocytes obtained from individuals suffering from the common cold after four days of infection and from healthy individuals (without the common cold infection). At a concentration of 25 ug/mL, gamma interferon (IFN-gamma) was increased by 24.03 fold and interleukin 4 (IL-4) by 1.71 fold for the cells obtained from individuals with the common cold (Group A). The extract suppressed IFN-gamma by 8.3% while IL-4 was stimulated by 9.90 fold from peripheral lymphocytes obtained from healthy individuals (Group B). Gamma interferon was suppressed at 250 microg/mL while IL-4 was elevated by 1.86 fold for cells obtained from individuals suffering from the common cold (Group A). In conclusion, BJE could have implications for the treatment of the common cold.


Assuntos
Infecções Bacterianas/imunologia , Infecções Bacterianas/terapia , Boehmeria , Resfriado Comum/imunologia , Resfriado Comum/terapia , Interferon gama/imunologia , Interleucina-4/imunologia , Fitoterapia/métodos , Sinusite/imunologia , Sinusite/terapia , Infecções Bacterianas/complicações , Humanos , Sinusite/microbiologia
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