Semi-Automated Line Immunoassay Strip Processor

What is the Semi-Automated Line Immunoassay Strip Processor?

This instrument automates reagent dispensing, rocking and washing for line immunoassay strips while the operator handles sample addition and transfer between trays. It suits laboratories with low to moderate volumes that want better consistency than fully manual processing at modest cost.

Overview

Strips are placed in a trough or tray, sample dilution is added by the operator or by the instrument depending on the configuration, and the processor then performs timed aspiration and dispensing of wash buffer, conjugate and substrate with continuous or intermittent rocking. Temperature can be controlled by a heated platform or left ambient, and the program steps are defined per kit. Capacity is usually six to twenty-four strips, and the instrument reduces the variability that comes from manual pipetting and timing while leaving the operator responsible for correct strip identification and for moving strips to the reader. Maintenance focuses on tubing, dispensing accuracy and trough cleanliness, and each run should be recorded with the protocol and reagent lots used.

How does it work?

Immunoblotting starts with proteins that are either separated by polyacrylamide gel electrophoresis and transferred to a membrane, or applied directly as discrete lines on a strip. The membrane is blocked to prevent non-specific binding, then incubated with diluted patient sample so that antibodies in the sample bind to their target antigens. After washing, an enzyme- or fluorophore-labelled anti-human antibody is added, and a substrate produces a visible, luminescent or fluorescent signal proportional to the bound antibody. Strips are read by eye, by a scanning densitometer or by a charge-coupled device camera, and each band is scored as absent, weak, moderate or strong, or quantified as an intensity ratio against a control band. Interpretation criteria for confirmatory assays are set by the manufacturer and by national guidance, and the pattern of reactive bands, not a single band, determines the reported result.

What are the key features?

• Timed aspiration and dispensing of wash, conjugate and substrate
• Continuous or intermittent rocking during incubation
• Heated platform option for temperature-controlled steps
• Capacity of six to twenty-four strips per run
• Reduced variability compared with manual pipetting and timing
• Program storage for different kit protocols

What are the technical specifications?

A typical semi-automated line immunoassay strip processor configuration offers strip capacity of 6–24 strips per run, rocking of Intermittent or continuous, 10–60 rpm, dispensing accuracy of ±5 % at 1 mL, temperature of Ambient or heated platform to 45 °C, reagent bottles of 4–6 positions with level detection and programs of Up to 20 stored protocols. Values are indicative of the product class; the exact figures for each configuration are confirmed on the quotation and the calibration documents supplied with the instrument.

Which applications is it used for?

The Semi-Automated Line Immunoassay Strip Processor is used in low-volume line immunoassay testing, autoimmune disease confirmation, infectious disease blot confirmation in clinics and veterinary immunoblot assays. Across the wider Immunoblot Systems class, laboratories also deploy it for HIV and hepatitis confirmatory testing, autoimmune antibody profile testing and lyme disease and syphilis confirmation.

Which standards and certifications apply?

Relevant standards and methods include ISO 15189, CLSI M53, CLSI EP05, CLSI EP17, WHO HIV testing strategy, IEC 61010-1 and IEC 61010-2-101. Certification candidates for this model are CE, ISO 13485 manufacturing and NMPA class II registration; each is to be confirmed for the specific configuration before shipment, and certificates are supplied only where they have been issued.

Work on a clean bench with gloves, since membranes are easily contaminated, and use only the buffers and dilutions specified in the kit, because salt concentration and pH change binding and washing efficiency. Keep incubation temperatures and times consistent, as band intensity varies with both, and avoid letting strips dry out between steps. Verify performance at installation with the kit's positive and negative controls and with a proficiency panel if available, and repeat the check with each new reagent lot. Clean the scanner or imaging optics regularly, keep the light source stable for fluorescence and luminescence work, and store images together with the patient identifier for the retention period required by local rules.

How do I select the right Semi-Automated Line Immunoassay Strip Processor?

Choose this variant when volume is below about thirty strips per week and full automation is not justified, but manual timing has caused inconsistent results. In the RFQ confirm the strip format accepted, whether sample dilution is dispensed automatically, the rocking range, and whether a heated platform is required by your kit protocols.

How does it compare with other Immunoblot Systems variants?

Decide first whether the laboratory processes strips manually or needs automated incubation and washing, because the processing step dominates hands-on time and reproducibility. Then choose the reading method: visual reading suits low volumes and is accepted for many line immunoassays, densitometry provides objective band intensity, and camera-based imaging supports chemiluminescence and multiplex fluorescence. Check that the instrument accepts the strip and membrane formats of your kits, that the software applies the manufacturer interpretation criteria, and that images and results are archived in a retrievable format. Confirm assay registration in your market, and the availability of controls, conjugates and substrates, since these consumables are kit specific and may have short shelf lives.