Urea Detection
Urea Detection - Related Videos
08:44
Denaturing Urea Polyacrylamide Gel Electrophoresis (Urea PAGE)
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Cited by 104 •
2009
Denaturing urea polyacrylamide gel electrophoresis is used to separate single-stranded DNA or RNA up to a limit of 500 nucleotides. Urea in combination with heat denatures samples and unstructured single strands migrate within the gel matrix according to their molecular weight.
07:52
Removal of Branched and Cyclic Compounds by Urea Adduction for Uk'37 Paleothermometry
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2023
Source: Laboratory of Jeff Salacup - University of Massachusetts Amherst As mentioned in previous videos, the product of an organic solvent extraction, a total lipid extract (TLE), is often a complex mixture of hundreds, if not thousands, of different compounds. The researcher is often only interested in a handful of compounds. In the case of our two organic paleothermometers (Uk'37 and MBT/CBT), the interest is in only 6 compounds (2 alkenones and 4 isoprenoidal glycerol dialkyl glycerol...
01:23
Urea Cycle
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2025
The urea cycle describes how liver cells convert ammonia to urea. Ammonia is a toxic waste product of protein catabolism. Land animals must convert ammonia into the less toxic urea which can be safely eliminated by the kidneys through urine. Marine animals excrete ammonia directly, and the surrounding water dilutes the ammonia to safe levels. There are five basic steps in the urea cycle: the conversion of ammonia (NH3) to carbamoyl phosphate the introduction of ornithine in the...
05:34
Denaturing Urea Polyacrylamide Gel Electrophoresis for RNA Analysis: A Technique to Separate Fluorescently Labeled Phosphorylated RNA Oligonucleotides from their Non-Phosphorylated Equivalents
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2025
In this video, we demonstrate a denaturing polyacrylamide gel electrophoresis for the separation of phosphorylated RNA species from their non-phosphorylated counterparts. The RNA species are fluorescently labeled for laser detection on the gel.
11:49
Synthesis of Soft Polysiloxane-urea Elastomers for Intraocular Lens Application
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Cited by 8 •
2019
This study describes synthetic routes for aminopropyl-terminated polydimethylsiloxanes and polydimethyl-methyl-phenyl-siloxane-block copolymers and for soft polysiloxane-based urea (PSU) elastomers. It presents the application of PSUs as accommodating an intraocular lens. An evaluation method for in vitro cytotoxicity is also described.
FAQs
The central reaction is urease-catalyzed hydrolysis: urea is converted into ammonia and carbon dioxide. That chemical change can alter the local pH or generate a measurable signal for a coupled sensor. The reaction therefore links molecular recognition of urea to signal transduction, allowing concentration to be inferred after calibration.
These approaches monitor different consequences of the same enzymatic reaction. pH-sensitive systems track acidity changes, colorimetric systems measure a visible color response, optical systems evaluate changes in light-related signals, and electrochemical systems measure an electrical response. The chosen format affects sensor design, equipment requirements, response behavior, and suitability for compact or automated monitoring.
Performance depends on selectivity, sensitivity, response time, calibration, and reliable operation in complex samples. Selectivity helps distinguish urea-related signals from sample effects, while sensitivity determines how clearly concentration changes can be resolved. Calibration connects the measured response with urea concentration, and response time indicates how quickly the system can support monitoring or process decisions.
A typical workflow places the sample in contact with a urease-containing sensing system, allows hydrolysis to produce ammonia and carbon dioxide, and records the resulting pH-sensitive, colorimetric, optical, or electrochemical response. Calibration is then used to relate that signal to concentration. The exact measurement arrangement depends on the sensor design and sample type.
Urea detection supports several monitoring settings, including biological fluids, agricultural products, water, and industrial streams. Its applications include automated wastewater analysis, fertilizer management, process control, environmental monitoring, and clinical monitoring of kidney function. These settings require the measurement system to remain useful across different sample compositions and operational demands.
Engineering applications translate the chemical response into practical devices and monitoring systems. Design efforts emphasize compact biosensors, automated analysis, calibration, selectivity, sensitivity, and dependable operation in complex samples. These priorities support point-of-use analytical technologies as well as larger-scale environmental, agricultural, industrial, and clinical monitoring workflows.