How do Nucleic Acid Analysis work?
Two measurement principles dominate. Absorbance analysis uses a 1 mm or 0.5 mm pathlength in a microvolume cell and reads at 260 nm, where nucleic acids absorb strongly, then scales the result to a standard 10 mm path. A260 of 1.0 corresponds to about 50 µg/mL double-stranded DNA, 33 µg/mL single-stranded DNA and 40 µg/mL RNA, and ratios at 260/280 and 260/230 indicate protein or salt contamination. Fluorescence methods use dyes that bind specifically to double-stranded DNA or to total RNA, so signal comes only from the target, which makes them more tolerant of protein, salts and free nucleotides. Capillary electrophoresis separates fragments in a sieving polymer and reports sizes in base pairs together with molarity. Automated workstations combine measurement with pipetting so samples can be diluted to a target concentration.
Which Nucleic Acid Analysis variants are available?
- Microvolume UV-Vis Nucleic Acid Analyzer — A spectrophotometer that measures 1 to 2 µL samples at 260, 280 and 230 nm on a pedestal, reporting concentration and purity ratios in seconds.
- Fluorescence Nucleic Acid Quantification System — A fluorometer that uses dyes specific for double-stranded DNA or RNA to quantify as little as a few picograms in 1 to 20 µL samples.
- Automated Capillary Electrophoresis Nucleic Acid Analyzer — An instrument that injects samples into sieving-polymer filled capillaries and reports fragment sizes, molarity and integrity values for each sample.
- Fluorescence Microplate Reader for Nucleic Acid Quantification — A plate reader that quantifies DNA or RNA in 96 or 384 wells with dye chemistry, giving high throughput and low sample use.
- Automated Nucleic Acid Quantification and Normalization Workstation — A robotic platform that measures concentration and then dilutes each sample to a target value, producing normalised plates ready for qPCR or sequencing.
How do I choose the right variant?
Choose the method by how much selectivity you need. Absorbance is fast, inexpensive and sufficient for routine plasmid or PCR checks, but it cannot distinguish DNA from RNA and is affected by protein, phenol and salts. Fluorescence dyes are selective for double-stranded DNA or RNA and need as little as a few picograms, which suits sequencing libraries and low-yield samples. Capillary electrophoresis adds size and integrity information that no spectrophotometer provides, which matters for library insert size and RNA integrity. Throughput then decides between single-tube devices, microplate readers and automated workstations that combine measurement with normalisation. Check the minimum sample volume, detection limit, linear range, required standards and the export format your data system accepts.
Where are Nucleic Acid Analysis used?
Nucleic Acid Analysis are specified in next-generation sequencing library quality control, template quantification before qPCR, plasmid and oligonucleotide quality checks, RNA integrity and purity assessment and normalisation of samples for screening panels.
Which standards and certifications apply?
Work with Nucleic Acid Analysis is commonly governed by ISO 20395, ISO 13485 manufacturing, MIQE guidelines, CLSI MM06-A2, IEC 61010-1 and IVDR (EU) 2017/746. Instrument certifications such as CE marking are confirmed per configuration and never assumed.
What are the key considerations before purchase?
Blank the instrument with the same buffer as the sample, because buffer absorbance differs and elution buffers containing guanidine or EDTA give misleading ratios. Keep the measurement pedestal clean and wipe it between samples to avoid carryover, and check microvolume accuracy with a reference standard periodically. Fluorescent assays need fresh standards and protection of dye reagents from light, and dye-based concentration depends on assay chemistry, so do not compare results from different kits. For fragment analysis, follow the vendor's sample and ladder preparation closely, since ionic strength affects injection. Store eluted nucleic acids cold, avoid repeated freeze-thaw, and record concentration, ratios and method with every sample.
