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- W2004376465 abstract "A simple technique for the condensation of cellular 5-hydroxytryptamine (5-HT) with formaldehyde gas is described. The technique, which is especially suited for quantitative cytofluormetric studies, involves the generation of formaldehyde gas from dry paraformaldehyde in a closed reaction vessel with the addition of a measured quantity of water. The fluorescence yield of 5-HT was tested at various humidities. Optimal results were obtained with the addition of 100 mg water to a 1000 ml reaction vessel containing 6 g of dry paraformaldehyde. A major advantage of the method if the fact that the humidity during the reaction can be precisely controlled. The fluorescence yield of 5-HT, tested over a 50 day period showed excellent reproducibility. The stoichiometry of the reaction was tested by comparison of cytofluormetic data with that obtained by analysing the 5-HT content of pooled mast cells with an independent biochemical method. A highly satisfactory correlation (r = 0.96) was obtained within the range of 0.1 to 4 pg of 5-HT per cell. The limit of sensitivity of the cytofluorometric method was found to be of the order of 10(-13) g, and was determined by the fluorescence blank of the mast cells. This contributes to between 10 and 30 per cent of the total fluorescence emission from mast cells containing about 0.2 pg of 5-HT." @default.
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- W2004376465 date "1977-01-01" @default.
- W2004376465 modified "2023-10-18" @default.
- W2004376465 title "Cytofluorometric quantitation of 5-hydroxytryptamine in mast cells: an improved technique for the formaldehyde condensation reaction." @default.
- W2004376465 doi "https://doi.org/10.1177/25.1.556750" @default.
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