What question did this study set out to answer?

Develop a rapid and efficient method for preparing iodine-131-labeled human growth hormone with high specific radioactivity while preserving its immunological properties.

October 1, 1963Biochemical JournalOpen Access

The Preparation of 131i-Labelled Human Growth Hormone of High Specific Radioactivity

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Authors

FGFC GreenwoodThe Honourable Society of Lincoln's Inn WHWM HunterBrigham Young University JGJ. GloverAmersham Hospital

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Implication

Laboratory study reveals high-yield preparation of iodine-131-labeled human growth hormone with intact immunoreactivity, indicating a reliable protocol for sensitive biological assays.

Key Points

Develop a rapid and efficient method for preparing iodine-131-labeled human growth hormone with high specific radioactivity while preserving its immunological properties.
Reacted 2 mCi of untreated, carrier-free iodine-131 iodide directly with 5 µg of human growth hormone protein.
Maintained low chemical substitution levels between 0.5 and 1.0 iodine atoms per hormone molecule.
Assessed radiochemical purity, degradation products, and immunological reactivity compared to unlabeled hormone and hormone substituted with iodine-127.
Achieved approximately 70% transfer of iodine-131 to protein, yielding a high specific radioactivity of 240–300 µCi/µg.
The labeled hormone contained no detectable degradation products and remained immunologically identical to the unlabeled hormone.
Demonstrated that excessive specific radioactivity or higher levels of chemical substitution with iodine-127 causes a loss of immunological reactivity.

Cite This Study

Greenwood et al. (1963) studied this question.

synapsesocial.com/papers/6a0dae1acecdf5fb20ba8ddc https://doi.org/10.1042/bj0890114

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October 1, 1963Biochemical JournalOpen Access

The Preparation of 131i-Labelled Human Growth Hormone of High Specific Radioactivity

View Full Paper

Ask AI

Bookmark

Authors

FGFC GreenwoodThe Honourable Society of Lincoln's Inn WHWM HunterBrigham Young University JGJ. GloverAmersham Hospital

Discussion

Member takes

Implication

Laboratory study reveals high-yield preparation of iodine-131-labeled human growth hormone with intact immunoreactivity, indicating a reliable protocol for sensitive biological assays.

Key Points

Develop a rapid and efficient method for preparing iodine-131-labeled human growth hormone with high specific radioactivity while preserving its immunological properties.
Reacted 2 mCi of untreated, carrier-free iodine-131 iodide directly with 5 µg of human growth hormone protein.
Maintained low chemical substitution levels between 0.5 and 1.0 iodine atoms per hormone molecule.
Assessed radiochemical purity, degradation products, and immunological reactivity compared to unlabeled hormone and hormone substituted with iodine-127.
Achieved approximately 70% transfer of iodine-131 to protein, yielding a high specific radioactivity of 240–300 µCi/µg.
The labeled hormone contained no detectable degradation products and remained immunologically identical to the unlabeled hormone.
Demonstrated that excessive specific radioactivity or higher levels of chemical substitution with iodine-127 causes a loss of immunological reactivity.

Cite This Study

Greenwood et al. (1963) studied this question.

synapsesocial.com/papers/6a0dae1acecdf5fb20ba8ddc https://doi.org/10.1042/bj0890114

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