Saliva Centrifugation
Saliva Centrifugation - Related Videos
06:58
Collection and Extraction of Saliva DNA for Next Generation Sequencing
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Cited by 45 •
2014
DNA extraction from saliva can provide a readily available source of high molecular weight DNA, with little to no degradation/fragmentation. This protocol provides optimized parameters for saliva collection/storage and DNA extraction to be of sufficient quality and quantity for downstream DNA assays with high quality requirements.
08:16
Saliva, Salivary Gland, and Hemolymph Collection from Ixodes scapularis Ticks
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Cited by 75 •
2012
The collection of infected tick hemolymph, salivary glands, and saliva is important to study how tick-borne pathogens cause disease. In this protocol we demonstrate how to collect hemolymph and salivary glands from feeding Ixodes scapularis nymphs. We also demonstrate saliva collection from female I. scapularis adults.
11:22
The α-test: Rapid Cell-free CD4 Enumeration Using Whole Saliva
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2012
A CD4 enumeration method, the α-test, is described which uses whole saliva to provide rapid and accurate CD4 counts. The α-test costs pennies and eliminates the need for technical training, costly reagents such as monoclonal antibodies, instrumentation, refrigeration, transport of samples, as well as collection and handling of blood.
05:40
Handheld Device for Saliva Pretreatment to Improve Cortisol Detection
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2026
This protocol describes a rapid saliva pretreatment method for improving cortisol detection. A handheld filtration device is used to remove mucins and other interfering substances while preserving the target analyte. The pretreated saliva exhibits improved capillary flow, thereby enabling more consistent and reproducible assay performance.
07:07
Working with Centrifuges
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2023
Source: Robert M. Rioux & Suprita Jharimune, Pennsylvania State University, University Park, PA Earth's gravitational force is capable of separating heterogeneous mixtures. However, many systems avert this type of separation owing to the length of time usually required in such cases. Centrifugation is one of the most powerful tools for the separation of heterogeneous mixtures1. It involves the application of centripetal force for sedimentation of the heavier phase, leading to separation of...
FAQs
Speed and duration determine how effectively particles sediment according to their size and density. Consistent settings help produce comparable clarified liquid and concentrated pellet fractions across samples. Standardization is important because variable centrifugation conditions can affect which cellular, microbial, or mucus-associated material enters the pellet and which soluble analytes remain available in the supernatant.
The two fractions concentrate different types of sample components. The pellet can contain sedimented cells, bacteria, mucus, and other dense particles, whereas the supernatant retains soluble proteins, nucleic acids, metabolites, and related analytes. Analyzing them separately allows investigators to associate biomarker, infectious-agent, genetic, or disease-associated findings with the fraction that contains them.
Temperature and handling conditions help preserve clinically relevant components during preparation. If these factors vary between samples, the resulting fractions may be less comparable or analyte preservation may be reduced. Establishing consistent handling and temperature conditions therefore supports reproducible medical analysis and helps researchers distinguish biological differences from variation introduced during sample processing.
A typical workflow begins with collecting and handling the saliva sample under standardized conditions, followed by centrifugation at defined speed, duration, and temperature settings. After rotation, the clarified liquid fraction and concentrated pellet are separated for downstream analysis. Keeping these preparation variables consistent makes results more reproducible across specimens and experiments.
Fraction selection depends on the type of target being investigated. Soluble proteins, nucleic acids, metabolites, and other soluble analytes are associated with the supernatant, while cells, bacteria, mucus, and other dense material are concentrated in the pellet. Researchers can therefore direct testing toward the fraction most relevant to the biomarker or agent under study.
This preparation method supports analysis of biomarkers, infectious agents, genetic material, and disease-associated changes in saliva. Separating sample components can improve the suitability of each fraction for downstream testing and monitoring. In medicine and biomedical research, standardized preparation helps investigators compare specimens reliably while examining clinically relevant signals in a noninvasive sample.