Qma Cartridge
Qma Cartridge - Related Videos
03:31
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0 Views •
2025
This video demonstrates a protocol for detecting serum-specific immunoglobulin E using a microfluidic cartridge-based chemiluminescence system. Serum IgEs interact with distinct allergens immobilized in the reaction zone of the cartridge, which are subsequently detected with peroxidase-conjugated anti-IgE antibodies and a chemiluminescent substrate, allowing simultaneous detection of multiple allergen-specific IgEs.
08:04
Use of a Filter Cartridge for Filtration of Water Samples and Extraction of Environmental DNA
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Cited by 133 •
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10:39
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04:33
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This video describes the extraction of circulating microRNA from plasma samples of colorectal cancer patients using organic extraction followed by glass-fiber column enrichment. miRNAs are stable in biological fluids such as serum and plasma, which renders them ideal circulating biomarkers for cancer diagnosis, prognosis, and treatment decision-making and monitoring. This method will help identify new circulating biomarkers capable of predicting clinical outcomes in patients.
08:45
Duplex Digital PCR for Simultaneous Quantification of Dual Genetic Markers
0 Views •
2025
In this video, we demonstrate the duplex digital PCR (ddPCR) technique — a modification of the traditional PCR technique that is useful in detecting two different genetic markers simultaneously. A single PCR reaction is partitioned into nanoliter-sized emulsified droplets that are independently amplified, and the detection of differently colored fluorescence amplification signals from the fraction of droplets is used to compute the initial concentration of the target sequences.
FAQs
Retention arises from electrostatic attraction between the sorbent’s permanently charged quaternary ammonium groups and anionic compounds in the loaded sample. Because those groups remain charged, the cartridge can capture negatively charged species while the sample moves through the bed. This charge-based interaction is the central chemical basis for separating target anions from other sample components.
Elution depends on weakening the interaction between retained anions and the sorbent. Adjusting solvent composition or ionic strength changes the chemical environment enough to release the captured compounds. This step is important because it converts selective retention into a recoverable fraction, allowing the analytes to be collected in a form suitable for subsequent chromatographic or spectrometric measurement.
A component’s charge relative to the sorbent’s fixed charge largely determines its behavior during loading and washing. Negatively charged compounds experience attraction and can remain on the cartridge, whereas neutral or positively charged components do not receive the same retention and are washed away. This contrast enables matrix cleanup without requiring every sample constituent to be individually identified.
A basic workflow begins by passing the chemical sample through the cartridge so anionic analytes contact the charged sorbent. Neutral and positively charged material is removed during the wash, and a change in solvent composition or ionic strength then elutes the retained fraction. Collecting that fraction prepares the target compounds for downstream analysis.
QMA Cartridge sample preparation is useful when complex environmental, biological, or pharmaceutical samples contain negatively charged analytes alongside interfering matrix components. The cartridge can isolate the anionic fraction and reduce unwanted material before measurement. In these settings, cleanup helps analytical methods focus on the compounds of interest rather than the full chemical complexity of the original sample.
Placed before chromatography or spectrometry, the cartridge can improve measurement quality by reducing interfering substances. It may also concentrate retained analytes into the eluted fraction, making them easier to assess. The resulting sample preparation supports chemical measurements, particularly when the original environmental, biological, or pharmaceutical matrix contains substantial complexity.