Laboratory electroporators: how can molecules be introduced efficiently into cells?

From bacterial transformation to primary cell engineering, electroporation is a physical method that opens, for the duration of a pulse, transient pores in the membrane. Electroporators precisely control voltage, pulse duration and number of pulses (square wave or exponential discharge) to maximise uptake of DNA/RNA, proteins or CRISPR complexes while preserving viability. Paired with sterile, compatible cuvettes and low-conductivity buffers, they deliver reproducible, non-viral transfections from microlitre volumes through to continuous-flow operation.

What different types of electroporator are there, and what are their applications?

There are two main families of electroporators. Exponential-decay discharge (capacitor discharge) models deliver a pulse whose amplitude falls over time. Rugged and easy to set (voltage, capacitance, sometimes resistance), they excel at bacterial transformation, yeasts and plant protoplasts. Square-wave systems maintain a constant amplitude for the programmed duration: more precise and highly programmable, they are favoured for demanding mammalian cells, where viability is critical. For scale-up, continuous-flow and microfluidic architectures enable large volumes and more closed GMP processes.

Essential to the workflow, sterile electroporation cuvettes (gap 1 mm, 2 mm or 4 mm) set the electric field (E=V/d) and the working volume (?10–400 µL). 1 mm targets high fields and low volumes—ideal for bacteria. 2 mm is the all-rounder. 4 mm suits fragile animal cells and larger volumes. Aluminium electrodes, a clear body for safe pipetting, sterility by irradiation: these single-use consumables limit contamination and arcing.

When choosing, consider: cell type and objective (efficiency vs viability), programmability (multiple pulses, ramps), buffer compatibility (low conductivity), arc detection, logging/traceability (up to 21 CFR Part 11), and safety options (lockable lid). The environmental footprint is driven mainly by disposable cuvettes; on the plus side, electroporation reduces reliance on viral vectors and overall energy use remains low.

Type	Principle	Applications
Exponential discharge	Decaying pulse (C–R)	Transformation of bacteria/yeast, protoplasts, screening
Square wave	Constant amplitude, set duration	Mammalian cells, CRISPR, sensitive primary cells
Flow electroporation	Continuous microfluidic channels	Large volume, GMP processes, bioproduction/therapies

In which applications is an electroporator used?

• Life sciences and molecular biology: bacterial transformation, cloning, libraries.
• Mammalian cells: non-viral transfection, CRISPR genome editing, producer cell lines.
• Biotech and pharma: strain engineering, CAR-T cells in development, delivery studies.
• Agri-food and fermentation: optimisation of industrial microorganisms and yeasts.
• Environment and microbiology: manipulation of difficult isolates, functional metagenomics.
• Cosmetics and chemistry: evaluation of active ingredients on cell models, vector-free formulation R&D.
• Plant science: protoplasts, varietal improvement and basic research.

The different types of electroporators and electroporation cuvettes available

Electroporation cuvette

Electroporators: frequently asked questions (FAQ)

How do I choose between square wave and exponential decay?
Exponential decay for bacteria/yeasts (simple and effective), square wave for animal cells (tighter control, better viability). Base your choice on the cell type and objective.

Which cuvette gap should I use (1, 2 or 4 mm)?
1 mm: high field, low volumes, bacteria. 2 mm: versatile (?40–200 µL). 4 mm: fragile cells/larger volumes (?200–400 µL). Adjust the voltage to the electrode gap.

How do I prevent arcing?
Use a low-conductivity buffer, remove salts and bubbles, wipe the outside of the cuvette, avoid overfilling and pre-chill for bacteria. Also check the cuvette’s integrity.

Are cuvettes reusable?
No—they are single-use to ensure sterility, gap geometry and to avoid electrode oxidation. Reusable flow chambers exist, but they are dedicated and validated.

Which safety/quality features should I prioritise?
Lid with interlock, arc detection, pulse monitoring, run log, predefined profiles, and 21 CFR Part 11 compliance in regulated environments.

Does electroporation damage cells?
A little, depending on field/pulse. Optimise voltage, duration, number of pulses and temperature, then allow a recovery phase. The efficiency/viability trade-off can be finely tuned.