Chemical Stability
Chemical Stability - Related Videos
01:53
RNA Stability
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2019
Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
03:18
Nuclear Stability
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2020
Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters. To hold positively charged protons together in the...
08:00
Chemical Synthesis of Porous Barium Titanate Thin Film and Thermal Stabilization of Ferroelectric Phase by Porosity-Induced Strain
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Cited by 9 •
2018
Here, we present a protocol for the synthesis of porous barium titanate (BaTiO3) thin film by a surfactant-assisted sol-gel method, in which self-assembled amphipathic surfactant micelles are used as an organic template.
13:10
Stability of Floating Vessels
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2023
Source: Alexander S Rattner and Kevin Rao Li Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, University Park, PA The objective of this experiment is to demonstrate the phenomenon of stability of floating vessels - the ability to self-right when rolled over to the side by some external force. Careful design of hull shapes and internal mass distribution enables seagoing vessels to be stable with low drafts (submerged depth of hull), improving vessel...
01:28
Stability
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2024
The time response of a linear time-invariant (LTI) system can be divided into transient and steady-state responses. The transient response represents the system's initial reaction to a change in input and diminishes to zero over time. In contrast, the steady-state response is the behavior that persists after the transient effects have faded. The stability of an LTI system is determined by the roots of its characteristic equation, known as poles. A system is stable if it produces a bounded...
FAQs
These degradation pathways alter drug molecules through different environmental triggers. Hydrolysis is associated with reactions involving moisture, oxidation reflects susceptibility to oxidative conditions, and photolysis results from light exposure. Because each pathway can change the active ingredient or create impurities, stability evaluations examine them separately to identify which conditions most threaten product quality.
Each condition can influence the rate or extent of drug degradation. Changes in pH may promote particular reactions, while higher temperature, light exposure, or moisture can accelerate temperature-, photolysis-, or humidity-related changes. Comparing these variables helps reveal vulnerable conditions and supports scientifically justified storage requirements for a formulation.
Degradation can modify the molecular structure of an active ingredient, reducing the amount of material available to produce the intended pharmacological effect. It may also generate impurities that affect product quality. Monitoring both potency and impurity formation therefore provides a broader assessment than examining molecular change alone, supporting consistent medicines throughout their intended use.
A stability study examines how a substance or formulation changes over time under specified conditions. Evaluations may compare pH, temperature, light exposure, humidity, and formulation conditions while tracking molecular structure, potency, quality, and impurities. The resulting evidence helps characterize degradation behavior and establish how long the product can remain suitable for use.
Stability findings identify environmental exposures that could compromise a medicine, including light, moisture, temperature, or formulation-related conditions. Pharmaceutical developers can use this information when selecting packaging and defining storage requirements. These decisions help limit degradation during the product’s intended period of use and preserve consistent quality for patients.
In pharmacology, stability evidence supports several stages of medicine development and oversight. It contributes to shelf-life determination, packaging selection, storage guidance, and quality-control decisions. By showing whether active ingredients remain effective and whether impurities emerge under relevant conditions, these studies also support patient safety and the consistency of pharmaceutical products.