Difference between revisions of "DIY NanoDrop"

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Prototype of LED-Photosensor Version<br>
 
[[File:DIYNanoDrop.jpg|440px]]
 
  
  
  
To start simple, two approaches are tested, one using an LED and a photo sensor. The second, more advanced, using a DIY spectrometer.<br>
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To start simple, two approaches are tested, one based on the DVD spectrometer by PublicLab and one using an LED and a photo sensor.<br>
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== LED-Spectrometer ==
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More advanced version based on a DIY spectrometer using a DVD-R optical diffraction
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grating and a USB webcam as described by PublicLab. Use the excellent online software workbench to analyse data - http://spectralworkbench.org/ . <br>
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[[File:NanoDropConceptSpectrometer2.png|420px]]
  
 
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[[File:DIY_NanoDropConceptLED.png|420px]]
 
[[File:DIY_NanoDropConceptLED.png|420px]]
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Prototype of LED-Photosensor Version<br>
 +
[[File:DIYNanoDrop.jpg|440px]]
  
 
High performance LEDs can replace expensive light source and filters for excitation.
 
High performance LEDs can replace expensive light source and filters for excitation.
  
== LED-Spectrometer ==
+
 
More advanced version based on a DIY spectrometer using a DVD-R optical diffraction
 
grating and a USB webcam as described by PublicLab. Use the excellent online software workbench to analyse data - http://spectralworkbench.org/ . <br>
 
  
 
== Resources ==
 
== Resources ==
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<br>
 
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[[File:NanoDropConceptSpectrometer2.png|420px]]
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Revision as of 15:27, 14 October 2014

DIY NanoDrop.jpg

Attempt to build DIY Microvolume Spectrophotometers or Fluorospectrometers to quantitate micro-volumes of sample. The NanoDrop products are very popular in scientific labs. The measurement principle of holding a drop between two points - the light source and the sensor - allows to measure samples as small as 0.5µL up to 2µL micro volume without a cuvette. The simple basic principle should be perfect for DIY lab equipment. Let's try.

Possible applications:

- Turbidity measurement
- Spectral data and purity analysis
- Measure nucleic acid, protein and colorimetric assays
- Microvolume fluorescence measurements




To start simple, two approaches are tested, one based on the DVD spectrometer by PublicLab and one using an LED and a photo sensor.

LED-Spectrometer

More advanced version based on a DIY spectrometer using a DVD-R optical diffraction grating and a USB webcam as described by PublicLab. Use the excellent online software workbench to analyse data - http://spectralworkbench.org/ .

NanoDropConceptSpectrometer2.png


LED-Photosensor

A flat head LED and a flat head photo diode are put together, a drop of liquid in between - this is it. Maybe add a screw to set the distance between the light source and the sensor. A small arduino can measure the light sensor and send the data to the computer via USB.

DIY NanoDropConceptLED.png

Prototype of LED-Photosensor Version
DIYNanoDrop.jpg

High performance LEDs can replace expensive light source and filters for excitation.


Resources

The very first prototype:

DIY NanoDropProto1.jpg




Now the NanoDrop principle seems to be patented (patent US6628382 and US6809826). However there are many similar products on the market under the term of "Microvolume Spectrophotometers"...? Doesn't matter anyways if you just build one for your own use.

DIY NanoDropPatent1.pngDIY NanoDropPatent2.png

DIY NanoDropTechnicalDrawing1.png


Links

http://www.google.com/patents/US6628382
http://www.google.com/patents/US6809826
http://www.google.com/search?q=Microvolume+Spectrophotometers&source=lnms&tbm=isch