Overview
ISO 20688-1:2020 - Biotechnology - Nucleic acid synthesis - Part 1: Requirements for the production and quality control of synthesized oligonucleotides - specifies minimum requirements for the production and quality control of synthetic oligonucleotides (single‑stranded DNA or RNA, nominally up to 250 bases). The standard defines common quality attributes (identity, purity, quantity, molar mass, melting temperature) and describes common analytical approaches and documentation practices to evaluate those attributes. It is intended for producers and users to improve quality management, ensure traceability and support fit‑for‑purpose selection of oligonucleotides.
Key technical topics and requirements
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Scope & definitions
- Applies to chemically synthesized DNA and RNA oligonucleotides (approximately 10–250 bases).
- Includes definitions for terms such as purity, reference material (RM) and certified reference material (CRM).
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Design and selection
- Guidance to choose oligonucleotides fit for purpose (e.g., PCR primers, microarray probes, NGS capture probes) and use of graded quality levels (e.g., genomic vs antisense grade).
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Quality management
- Producers must document processes for order receipt, production and quality control, implement a quality management system, document control and personnel training, and maintain safety controls.
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Production process requirements
- Covers synthesis, purification, drying and formulation, plus process checklists and resource/equipment control.
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Quality control (QC) processes
- Validation/verification of analytical methods.
- Identity verification (sequence confirmation).
- Purity assessment (e.g., HPLC or capillary electrophoresis with area normalization; OD260 measurement guidance).
- Quantity reporting (concentration and mass).
- Molar mass / base length calculations and melting temperature (Tm) assessment.
- Requirements for reporting and corrective action verification.
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Additional RNA requirements
- Supplementary controls specific to synthetic oligoribonucleotides.
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Informative annexes
- Process checklist, equipment list, molar mass calculations, mass analysis verification examples, CRM measurement accuracy examples, and Tm calculation methods.
Practical applications and users
Who uses ISO 20688-1:
- Oligonucleotide manufacturers and custom synthesis service providers - implement consistent production and QC.
- Quality control and analytical laboratories - standardize testing methods (HPLC, CE, mass spectrometry).
- Biotech and pharmaceutical developers - specify required grades for primers, probes, therapeutics and starting materials.
- Regulatory and compliance teams - align production practices with regional regulations and GMP when oligos are used as investigational drugs.
- Research labs and core facilities - improve procurement specifications and reproducibility for PCR, NGS, microarray and gene synthesis workflows.
Related standards
- Part of the ISO 20688 series prepared by ISO/TC 276 (Biotechnology). Users should consult other parts of the series and applicable regional regulations or GMP guidance when oligonucleotides are used in regulated therapeutics or clinical applications.
Keywords: ISO 20688-1, synthesized oligonucleotides, oligonucleotide quality control, HPLC, capillary electrophoresis, mass spectrometry, purity, identity, Tm, GMP, synthetic RNA.