Detection of bacterial endotoxins using the PYROSTAR™ ES-F/Plate LAL assay
Perform the PYROSTAR ES-F/Plate LAL test your way— BMG LABTECH readers support both turbidimetric and nephelometric evaluation for maximum flexibility.
The world’s first and only laser-based microplate nephelometer was developed to meet high-throughput demands for fast compound solubility screens. The NEPHELOstar® Plus detects insoluble particles in liquid samples by measuring forward scattered light and can be used for turbidity measurements, drug solubility screening, protein binding kinetics, microbial growth, and petroleum process control.

The NEPHELOstar Plus is a microplate nephelometer with a high-intensity laser diode. It can be up to thirty times more sensitive than traditional transmission optical density readers that measure the reduction in direct light passing through a sample well. Thanks to its speed, flexibility, and performance, the NEPHELOstar Plus allows more applications to be adapted to microplate-based laser nephelometry than ever before.
The NEPHELOstar Plus is for research use only.

BMG LABTECH microplate readers are built to be robust and reliable. No calibration of optical components is required. Recommended maintenance includes plate carrier offset adjustments, cleaning optical components, software/firmware updates, and routine performance checks.
BMG LABTECH offers flexible maintenance plans to ensure long-term performance. Costs depend on the chosen plan. Contact us using the service contract form.
Yes, comprehensive technical support and training services are available to assist users in maximizing the instrument’s capabilities. Contact us to find out more.
You can find detailed product information, specifications, and available configurations on the NEPHELOstar Plus product page. For purchase options, quotes, or personalized recommendations, please send a sales request directly.
Reader manuals are included with every instrument. If you no longer have your manual, please use our manual request form to obtain a copy.
The software is included with every reader and can be installed on as many computers as needed. You can find it on a USB stick (or CD for older models) included with the manual. If you’ve misplaced the USB stick or CD, we can provide a download link. Contact our software support.
Yes. NEPHELOstar Plus software from version V3.00 R3 is fully compatible with Windows 11. To ensure smooth operation on Windows 11, or if you need help with installation or have compatibility questions, please contact our software support.
Costs vary depending on the chosen configuration. Contact us for a personalized quote.
Yes, we provide comprehensive How-To Notes that explain common detection parameters, how they influence your results, and practical tips for optimizing measurements. You can find these resources on our How-To notes page.
Delivery times depend on model availability, configuration and your location. For accurate lead times, please send a general request on the contact page directly.
Perform the PYROSTAR ES-F/Plate LAL test your way— BMG LABTECH readers support both turbidimetric and nephelometric evaluation for maximum flexibility.
Nephelometric turbidity units (NTUs) refer to the concentration of particles to describe the quality of water. Read how the NEPHELOstar® Plus microplate nephelometer determines NTUs in low sample volume.
Laser nephelometry was used for the rapid determination of the solubility of potential antimycotic drug compounds and for the measurement of fungal growth in the microplate format.
An alternative method to test Rheumatoid Factors by microplate nephelometry provides an inexpensive assay that can be used in medium- to high-throughput labs. Read more here!
Laser nephelometry is a reliable and sensitive technique to monitor microbial growth. Check out its good correlation with absorbance turbidity measurements in this AppNote!
Tired of performing solubility tests for your compound libraries? Nephelometry offers a rapid, reliable and low-cost method for kinetic solubility screenings in high-throughput!
Nephelometry (light scattering)
Endpoint and kinetic
Up to 384-well plates
Robot compatible
Self-monitoring laser diode
Wavelength 635±10 nm
Stability <0.2% deviation
Lifetime 20,000 hours
Output: 1 mW
Selectable beam width: 1.5 to 3.5 mm
Selectable intensity 0-100%
Scattering angle: detects up to 80° full cone angle
Side window photodiode detector
Photodiode
Wavelength 635±10 nm
Depending on particle size and liquid properties
Silica detection (particle size 0.5 to 10 µm) 800 nM
Dynamic Range: 5 decades
Maximum count rate (2,000,000 Relative Nephelometry Units (RNUs) per second)
Depend on assay conditions and liquid surface stability
Shortest times possible: 16 s (96), 47 s (384)
Linear, orbital, and double-orbital with user-definable time and speed
System to inject an atmosphere or to pull a vacuum into the reader
+4 °C above ambient up to 45 °C
The upper heating plate of the incubation chamber operates at 0.5 °C more than the lower plate. This prevents condensation build-up on the lid or sealer
Multi-user Reader Control and MARS Data Analysis Software included
FDA 21 CFR Part 11 compliant
Width: 44 cm, depth: 48 cm, height: 32 cm; weight: 25 kg
Up to 2 built-in reagent injectors
Injection at measurement position (6 to 384-well)
Individual injection volumes for each well (3 to 500 µL)
Variable injection speed up to 420 µL/s
Up to four injection events per well
Reagent back flushing
Microplate incubator and shaker
Actively regulates O2 and CO2 0.1-20%
Magazines for up to 50 plates - continuous loading feature
Please contact your local representative for upgrades including options such as detection modes, reagent injectors, etc