Overview

Utilising the successful pE-300 Series platform, the pE-340fura is a bespoke LED Illuminator for Fura-2 ratiometric calcium imaging, which also supports everyday fluorescence microscopy in a compact and affordable package.  

As a result of our collaboration with the University of Strathclyde, we are excited to be launching the pE-340fura in September 2017.

Utilising the successful pE-300 Series platform, the pE-340fura is a bespoke LED Illuminator for Fura-2 ratiometric calcium imaging, which also supports everyday fluorescence microscopy in a compact and affordable package.  

The 340nm and 380nm LED illumination system provides the optimum excitation wavelengths for Fura-2-based calcium imaging allowing high-precision, stable, high-throughput imaging with video-rate time resolution. 

340nm Excitation 380nm Excitation

The images above show a field of cardiac myocytes (heart cells).  The cells were loaded with Fura-2 using standard conditions (i.e. incubation with 2 micromolar Fura-2 acetoxymethyl ester for 30 minutes, followed by an additional 30 minutes for de-esterification.

Images were obtained by Martin Bootman and Katja Rietdorf, School of Life, Health and Chemical Sciences, The Open University, UK.

Until recently, the response time of illumination systems for Fura-2 imaging have been limited to milliseconds due to mechanical switching of the wavelengths in arc lamp and monochromator systems.  However, the new pE-340fura can be controlled via convenient BNC TTL connections for precise illumination control in as little as 20 microseconds.

Spontaneous Ca2+ events are induced in Mg2+-free HBS. (A) Representative trace from a single hippocampal neuron of Mg2+-free induced Ca2+ events imaged at 0.5 Hz and (B) representative trace from two hippocampal neurons of Mg2+-free induced Ca2+ events imaged at 24.39 Hz.

TINNING, P. W., FRANSSEN, A. J. P.M., HRIDI, S. U., BUSHELL, T. J. and MCCONNELL, G. (2017), A 340/380 nm light-emitting diode illuminator for Fura-2 AM ratiometric Ca2+ imaging of live cells with better than 5 nM precision. Journal of Microscopy. doi:10.1111/jmi.12616

 

Using the new pE-340fura LED Illumination System, less Fura-2 dye can be loaded into the cells whilst still maintaining the same measured calcium concentration and good signal-to-noise ratio.  The reduction in required dye not only improves cell-viability due to reduced dye toxicity, but also results in a cost reduction per experiment.

Comparison of Ca2+ increases obtained from the application of trypsin (100 nM) to tsA-201 cells loaded with different concentrations of Fura-2 AM.

TINNING, P. W., FRANSSEN, A. J. P.M., HRIDI, S. U., BUSHELL, T. J. and MCCONNELL, G. (2017), A 340/380 nm light-emitting diode illuminator for Fura-2 AM ratiometric Ca2+ imaging of live cells with better than 5 nM precision. Journal of Microscopy. doi:10.1111/jmi.12616

 

Work by Sandrine Prost et al., from the University of Edinburgh, has shown that with independent wavelength controllable LED sources, signal-to-noise is dramatically improved over bulb systems and even over some available white wide spectrum LED sources.

High levels of autofluorescence and fast photobleaching of specific fluorescence when illuminating Qdots with Metal Halide.  

Prost S et al (2016) Choice of Illumination System & Fluorophore for Multiplex Immunofluorescence on FFPE Tissue Sections. PLoS ONE 11(9): e0162419. doi:10.1371/journal.pone.0162419

 

There are two pE-340fura configuration options:

Direct-fit for connecting to a microscopes – by selecting from a range of microscope adaptors  which covers all current and most older models.  A simple once only adjustment will allow optimisation to the optical path of the microscope.

Liquid Light Guide with a fixed 3mm diameter, liquid light guide.  An optional pE-340fura Universal Collimator can be specified in conjunction with a microscope adaptor if required, containing optics optimised to transmit the 340nm.

 

The pE-340fura offers:-

Power requirements
100-240V a.c. 50/60Hz, 1.4A


Power consumption

Standby Max 2W
1 band (white) at 100% intensity Max 24W
2 bands (340 + white) at 100% intensity Max 30W
3 bands (All) at 100% intensity 36W


Dimensions
pE-340fura Light Source: 77mm(w) x 186mm(d) x 162mm(h) - Weight 1.40kg
pE-340fura Control Pod: 88mm(w) x 125mm(d) x 37mm(h) - Weight 0.32kg
pE-340fura Power Supply: 167mm(w) x 67m(d) x 35mm(h) – Weight 0.62kg

pE-Universal Collimator: 44mm(w) x 86mm(d) x 44mm(h) – Weight 0.17kg

 

Environment & Safety
LED products are more sustainable and energy efficient than conventional illuminators. CoolLED's products have the following benefits:

  • Mercury-free
  • Energy Efficient: 80% less power
  • Long lifetime (25,000 operating hours)
  • No bulb replacements
  • Reduced risk of eye damage
  • Quiet operation
  • No special disposal regulations or issues

 

Warranty
System = 24 months extendable by free product registration.
LEDs = 36 months (NB 340nm LED warranted for 3000 hours accumulated use)

Control pod for operation and access to settings and usage history.

Manual:
Manual control for instant on/off and intensity control in 1% steps from 0 – 100%
Individual bands can be selected/deselected and controlled independently as desired

 

Remote:
Via global and individual channel TTL for on/off control of selected channels using a BNC connection on the light source.
Triggering speed <20us at full power

 

Connectivity:
Remote via USB (B type) for imaging software control (see Imaging Software)

 

Sequence Runner:
Single TTL input to step through user defined sequence. 
Triggering speed <20us at full power

Direct-fit to a microscope
Specify from CoolLED’s range of epi-fluorescent or transmitted port microscope adaptors

Liquid Light-Guide
3m long, 3mm diameter UV liquid light-guide.

pE-340-FR-D-YYY-ZZ: pE-340fura Illumination System.  Direct Fit.  Includes Light Source, exchangeable microscope adaptor (YYY) to customer-specified microscope, remote manual control pod, set of three excitation filter holders (25mm dia.)  and power supply (ZZ). 
pE-340-FR-L-ZZ: pE-340fura Illumination System.  For use with 3mm Liquid Light Guide.  Includes Light Source, remote manual control pod, set of three excitation filter holders (25mm dia.), and power supply (ZZ). 
pE-1910 3m long, 3mm diameter UV liquid light guide for use with pE-340fura 
pE-340-FR-COLL-YYY pE-340fura Universal Collimator for use with a single liquid light guide. Includes Microscope Adaptor (YYY) to customer-specified microscope

To specify microscope code (YYY) see Adaptors
To specify power cable (ZZ):  10 = Australia, 20 = Europe, 30 = UK, 40 = USA

CoolLED pE-340fura Leaflet

CoolLED pE-340fura Declaration of Conformity

pE-340-FR-COLL-YYY:   pE-340fura Universal Collimator for use with a single liquid light guide. Includes customer specified microscope adaptor (YYY)

 

To specify microscope code (YYY) see Adaptors