Spectrophotometric Determination of Residual Δ<sup>4</sup>-3-Ketosteroids in Bulk Δ<sup>1,4</sup>-3-Ketosteroids.  Differential Rates of Thiosemicarbazone Formation

Forist, Arlington A.

doi:10.1021/ac60149a002

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1962

1983

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Cited by 8 publications

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“…The highly active glucocorticoid and anti-inflammatory 1,4-3-ketosteroids are synthesized from A4-3-ketosteroids and, therefore, the residual A4-3-ketosteroids must be determined. Forist (4) described an excellent spectrophotometric method for residual A4-3-ketosteroids which involved a two-hour reaction with thiosemicarbazide.…”

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confidence: 99%

Polarographic Monitoring of Differential Reaction Rates. Determination of Δ⁴-3-Ketosteroids in the Presence of Δ^1,4-3-Ketosteroids.

Krivis¹,

Supp²

1963

Anal. Chem.

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confidence: 99%

Polarographic Monitoring of Differential Reaction Rates. Determination of Δ⁴-3-Ketosteroids in the Presence of Δ^1,4-3-Ketosteroids.

Krivis¹,

Supp²

1963

Anal. Chem.

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Spectrophotometric methods for monitoring the microbial transformation of steroids. II. Absorbance ratio spectrophotometric determination of per cent conversion of 9α‐fluoro‐16α‐hydroxyhydrocortisone to 9α‐fluoro‐16α‐hydroxyprednisolone

Ivashkiv

1971

Biotech & Bioengineering

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SummaryA process method has been developed for estimating rapidly the conversion of 9a-fluoro-16a-hydroxyhydrocortisone to 9~-fluoro-l6a-hydroxyprednisolone in fermentation broths. This allows frequent analyses of samples during the fermentation cycle. The absorbance ratio determination of conversion of the steroids is based on the measurement of the absorbance of aqueous steroid borate complexes at 241.5 mp and 271 mp.

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Analytical Applications of Ultraviolet, Visible, and Near-Infrared Absorption Spectrophotometry

White¹

1962

Progress in Infrared Spectroscopy

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Spectrophotometric Determination of Residual Δ⁴-3-Ketosteroids in Bulk Δ^1,4-3-Ketosteroids. Differential Rates of Thiosemicarbazone Formation

Cited by 8 publications

References 15 publications

Polarographic Monitoring of Differential Reaction Rates. Determination of Δ⁴-3-Ketosteroids in the Presence of Δ^1,4-3-Ketosteroids.

Polarographic Monitoring of Differential Reaction Rates. Determination of Δ⁴-3-Ketosteroids in the Presence of Δ^1,4-3-Ketosteroids.

Spectrophotometric methods for monitoring the microbial transformation of steroids. II. Absorbance ratio spectrophotometric determination of per cent conversion of 9α‐fluoro‐16α‐hydroxyhydrocortisone to 9α‐fluoro‐16α‐hydroxyprednisolone

Analytical Applications of Ultraviolet, Visible, and Near-Infrared Absorption Spectrophotometry

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Spectrophotometric Determination of Residual Δ4-3-Ketosteroids in Bulk Δ1,4-3-Ketosteroids. Differential Rates of Thiosemicarbazone Formation

Cited by 8 publications

References 15 publications

Polarographic Monitoring of Differential Reaction Rates. Determination of Δ4-3-Ketosteroids in the Presence of Δ1,4-3-Ketosteroids.

Polarographic Monitoring of Differential Reaction Rates. Determination of Δ4-3-Ketosteroids in the Presence of Δ1,4-3-Ketosteroids.

Spectrophotometric methods for monitoring the microbial transformation of steroids. II. Absorbance ratio spectrophotometric determination of per cent conversion of 9α‐fluoro‐16α‐hydroxyhydrocortisone to 9α‐fluoro‐16α‐hydroxyprednisolone

Analytical Applications of Ultraviolet, Visible, and Near-Infrared Absorption Spectrophotometry

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Spectrophotometric Determination of Residual Δ⁴-3-Ketosteroids in Bulk Δ^1,4-3-Ketosteroids. Differential Rates of Thiosemicarbazone Formation

Polarographic Monitoring of Differential Reaction Rates. Determination of Δ⁴-3-Ketosteroids in the Presence of Δ^1,4-3-Ketosteroids.

Polarographic Monitoring of Differential Reaction Rates. Determination of Δ⁴-3-Ketosteroids in the Presence of Δ^1,4-3-Ketosteroids.