Development↦Biobanking↦Handling of Biological Material↦Sample Processing
Was betrifft es? Warum ist das wichtig?
Sample processing is the sample-workflow step where collected Biological Material (BM) undergoes additional handling.
The aim is to:
- Preserve properties of interest by preparing BM for long-term storage (e.g. tissue preservation with FFPE)
- Extract BM of interest (e.g. blood serum from whole blood through centrifugation)
- Prepare for multiple downstream analysis by aliquoting collected MB (e.g. aliquot a batch of serum sample into small separate vials)
Standard procedures for BM processing ensure that:
- BM is of high quality (e.g. cells remain viable, protein degradation is prevented, RNA remains stable)
- BM aliquots are comparable (e.g. standard thickness of tissue slicing, centrifugation speed and temperature)
- Analytical results obtained from BM aliquots or different research sites are comparable
Mehr
BM processing procedures can be based on:
- Internationally accepted standards, such as ISO 20387 (e.g. internationally validated procedures for the preservation of tissue DNA and RNA). In order to make analytical results comparable:
- Research sites must comply with given standards
- Newly established processing methods must be validated
- A study applicable laboratory manual describing techniques for BM processing. Methods should include validated study specific processing procedures required for the downstream analysis. A reference to the laboratory manual should be made in the study protocol
Was muss ich befolgen?
Define sample processing procedures. Based on criteria needed for downstream analysis define the:
- Timing regarding maximal acceptable delay between BM collection and processing
- Required number of samples including volume and/or concentration (e.g. an analysis might require a minimum of viable cells)
- Type of BM (e.g. liquid or tissue sample)
- BM extract of interest (e.g. plasma, buffy coat, viable or PBMC from whole blood)
- Needed material and sample storage containers. Include special requirements needed for expected long term storage (e.g. centrifuge, temperature bath, vial type, special coatings, additives, cryopreservation solution, back-up samples)
- Special labelling requirements (e.g. coding, freezer stable stickers)
Create standardised forms to document:
- Performed BM processing steps
- Occurrence of non-conformities (e.g. BM exposure to sub-optimal temperature or conditions, centrifugation was performed at room temperature and not as required 4°C)
Mehr
Define processing steps in a SOP and/or WI, and ensure staff is properly trained.
In the event BM do not meet acceptance criteria for downstream analysis, a process or reference should be included on how to manage these events (e.g. sample destruction, documentation or report of non-conformity)
Wo kann ich Hilfe anfordern?
Your local Research Support Centre↧ can assist you with experienced staff regarding this topic
Basel, Departement Klinische Forschung (DKF), dkf.unibas.ch
Lugano, Clinical Trials Unit (CTU-EOC), ctueoc.ch
Bern, Department of Clinical Research (DCR), dcr.unibe.ch
Geneva, Clinical Research Center (CRC), crc.hug.ch
Lausanne, Clinical Research Center (CRC), chuv.ch
St. Gallen, Clinical Trials Unit (CTU), h-och.ch
Zürich, Clinical Trials Center (CTC), usz.ch
The Swiss Biobanking Platform (SBP) can provide you with support on this topic.
SBP Documents
SOPs, Forms and Templates – see in particular
- Biological Material SOP
References
ISO 20387:2018 Biotechnology - Biobanking (access liable to cost)- General Requirements for Biobanking – see in particular section
- 7.6 Preparation and preservation of biological material
- Specifications for pre-examination processes for frozen tissue
- Part 1: Isolated RNA (ISO 20184-1:2018)
- Part 2: Isolated proteins (ISO 20184-2:2018)
- Part 3: Isolated DNA (ISO 20184-3:2021)
- Specifications for pre-examinations processes for formalin-fixed and paraffin-embedded (FFPE) tissue
- Part 1: Isolated RNA (ISO 20166-1:2018)
- Part 2: Isolated proteins (ISO 20166-2:2018)
- Part 3: Isolated DNA (ISO 20166-3:2018)
- Part 4: In situ detection techniques (ISO 20166-4:2021)
- Specifications for pre-examinations processes for venous whole blood
- Part 1: Isolated cellular RNA (ISO 20186-1:2019)
- Part 2: Isolated genomic DNA (ISO 20186-2:2019)
- Part 3: Isolated circulating cell free DNA from plasma (ISO 20186-3:2019)
- Specifications for pre-examinations processes in metabolomics
- Urine, venous blood serum and plasma (ISO 23118:2021)