Inoculating Needles/Loops

What Are Inoculating Loops and Needles?

Inoculating loops and needles are sterile single-use transfer instruments used to move microbial cultures between growth media in clinical and research microbiology. The loop — a circular or oval-tipped instrument — picks up a controlled film of specimen for streak-plate isolation or subculture. The needle — a straight-tipped instrument — is used for stab inoculation of deep-agar media for motility testing, gelatin liquefaction tests, and agar stab preservation. Disposable polystyrene devices eliminate the flaming and cooling steps required for metal loops, reducing open-flame risk and improving throughput. Choose calibrated 1µL or 10µL loops when standardised inoculum volume is required; choose non-calibrated loops for routine streak plates and subculture.

What you will find:

• Sterile Plastic Loops: During streak-plate isolation, smooth edges stop agar from being gouged.

• Disposable Needles: Sturdy precision tips for precise stabs for colony selection.

• For quantitative microbiological testing, calibrated loops guarantee precise volumetric transfer.

• Rigid Transfer Needles: Stable handling to lower the possibility of cross-contamination and splashing.

• Bulk supply for high-throughput diagnostic facilities at 100/Bag (10 Bags/Unit).

• Bulk Case of 500: Economical packaging to expedite your purchase procedure.

How to Choose Inoculating Loops and Needles

Loop vs. Needle
Loops are for surface inoculation — streak-plate isolation, subculture from a primary plate to broth, and transfer of colonial material for gram staining or susceptibility testing. Needles are for deep inoculations — pushing into soft agar (SIM medium, motility agar, gelatin) to test motility, gas production, or to make long-term agar stab storage cultures.


Calibrated vs. Non-Calibrated
Calibrated loops are precision-manufactured to transfer a fixed volume: 1µL (0.001mL) for urine culture quantitation per CLSI M35-A2, and 10µL (0.01mL) for water and food microbiology quantitative methods. Non-calibrated loops transfer variable volumes and are adequate for qualitative streak-plate isolation and subculture.


Smooth-Edge Design
Smooth-edge polystyrene loops have a rounded wire geometry that glides across the agar surface without gouging, maintaining clean streak lines for efficient colony isolation. Agar gouging — tearing of the agar surface — disrupts the streak pattern and reduces colony isolation efficiency.


Bulk Pack Options
MBP stocks loops in 100/bag (10 bags/unit = 1,000 loops) for clinical labs; cases of 500 available for economical purchasing. Select pack size based on daily usage volume to minimise per-loop cost.

Specifications Context

Disposable polystyrene inoculating loops at MBP have smooth, rounded loop edges produced by precision injection moulding. Calibrated loops are manufactured to ±5% accuracy on their stated volume. For urine culture, a 1µL loop on a standard blood or MacConkey agar plate converts colony count to CFU/mL by multiplying by 1,000 — the standard calculation per CLSI M35-A2 for UTI diagnosis. Bulk packaging: 100 loops per bag, 10 bags per unit (1,000 total); cases of 500 available. Used loops that have contacted blood or urine are biohazardous waste; dispose per facility policy.  MBP stocks all formats for clinical and research labs worldwide.

Ready to stop ghosting your incubator and get some real results? Ask the helpful staff at MBP for a quote right now.