Fractionation, isolation and chemical characterization of skin test active components of histoplasmin
- 1 January 1969
- journal article
- Published by Oxford University Press (OUP) in Medical Mycology
- Vol. 7 (1) , 1-11
- https://doi.org/10.1080/00362177085190021
Abstract
Evidence presented in this paper indicates that crude histoplasmins may be fractionated by Sephadex G-25 chromatography, resulting in quantitative yield of skin test active material. Data obtained from fractionations of four separate histoplasmin lots indicates that the procedure is applicable in varying degrees of efficiency to histoplasmins of varying degrees of skin test potency. Colorimetric estimation of protein, carbohydrate and electrophoretic data suggest that the skin test active component may be a protein-carbohydrate complex. Other data indicate that the skin test active complex is either grossly contaminated with inert materials of approximately similar molecular weight or consists of a major component complexed with a protein moiety. It has been possible to dehydrate the skin test active component to a powdered state. The powder is easily re-dissolved in sterile non-pyrogenic distilled water or physiological saline and apparently retains its skin test activity. The principal contributions of these investigations have been: (1) Isolation of the skin test active component from crude histoplasmins. (2) Development of rapid and relatively simple methods applicable to large scale fractionation and isolation of the skin test active component from crude histoplasmin. (3) Suggestion that the skin test active principle is in fact a protein-carbohydrate complex, and (4) Indications that dehydrated skin test active material may be quantitated in terms of dose weight. La evidencia presentada en este papel indica, que los Histoplasmina cruda pueden ser fracctionados cromatográficamente por medio de Sephadex G 25, dando resultado a un rendimiento cuantitativo de material activo para pruebas dermatologicas. Datos obtenidos del fraccionamiento de cuatro lotes separados de Histoplasma indican que el procedimiento es aplicable en diferentes grados de eficacia a Histoplasma, de diversos grados de potencia usados en la prueba dermatológica. Valoración colorimétrica de proteinas, hidratos de carbono y electroforéticos sugieren, que el componente activo de la prueba dermatológica puede ser un complejo proteina-hidrato de carbono. Otros datos indican que el complejo activo de la prueba dermatológica está toscamento contaminado con material inerte de peso molecular aproximado, o está compuesto de un componente principal complejo que contiene una mitad proteica. Ha sido posible deshidratar el componente activo de la prueba dermatológica al estado de polvo. El polvo es facilmente redisuelto en agua destilada esteril libre de pirógenos, o en solución salina fisiológica; y aparentemente retiene su actividad en la prueba dermatológica. Las contribuciones principales de estas investigaciones han sido:Keywords
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