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The conventional method of hygroscopicity determination proposed by Callahan and co-workers utilizes more sample and time, may not be precise in all the cases, and is a relatively broader classification system. The method of indicating degree of hygroscopicity as per European Pharmacopoeia considers equilibration of sample for 24 hours under single humidity condition and may not necessarily ensure equilibration in all the cases. Additionally, both these methods do not provide information on solid state changes occurring within the sample during the course of experiment. This research work envisages an efficient throughput method for hygroscopicity determination, and validates it with active and inactive pharmaceutical ingredients using sorption analysis. Further, this method has been performed under optimal equilibration conditions, in a throughput manner (consuming less sample and time), with additional information on solid state changes occurring within the experimental conditions. This throughput method would be a valuable tool for hygroscopicity assessment of new chemical entities, during drug development in particular, and across all pharmaceutical materials in general.
Pharmaceutical Development, Aurigene Discovery Technologies Limited , Bollaram Road, Miyapur, Hyderabad, Andhra Pradesh , India.
This article was published in the following journal.
Name: Pharmaceutical development and technology
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Physiologically inactive substances that can be converted to active enzymes.
An enzyme that catalyzes the conversion of phosphorylated, inactive glycogen synthase D to active dephosphoglycogen synthase I. EC 188.8.131.52.
A naturally occurring glucocorticoid. It has been used in replacement therapy for adrenal insufficiency and as an anti-inflammatory agent. Cortisone itself is inactive. It is converted in the liver to the active metabolite HYDROCORTISONE. (From Martindale, The Extra Pharmacopoeia, 30th ed, p726)
The predominant milk-clotting enzyme from the true stomach or abomasum of the suckling calf. It is secreted as an inactive precursor called prorennin and converted in the acid environment of the stomach to the active enzyme. EC 184.108.40.206.
Drugs that are pharmacologically inactive but when exposed to ultraviolet radiation or sunlight are converted to their active metabolite to produce a beneficial reaction affecting the diseased tissue. These compounds can be administered topically or systemically and have been used therapeutically to treat psoriasis and various types of neoplasms.
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