What kind of cuvette can be used during spectrophotometry?
Plastic. Plastic cuvettes are often used in fast spectroscopic assays, where high speed is more important than high accuracy. Plastic cuvettes with a usable wavelength range of 380–780 nm (the visible spectrum) may be disposed of after use, preventing contamination from re-use.
Are cuvettes disposable?
Disposable cuvettes are ideal for analysis of DNA, RNA and proteins, replacing expensive fragile quartz cuvettes. They eliminate the tedious chore of cleaning quartz cuvettes and eliminate cross-contamination risk.
How does a wet cuvette affect absorbance?
On a spectrophotometer which measures how much light is absorbed, it is safe to say that less light will reach the sample in a dirty cuvette. Therefore, the machine will interpret this as more light being absorbed. So, in other words, if the cuvette is dirty, the readings will be off.
Why is plastic cuvette not suitable for UV?
Generally plastic cuvettes strongly absorb UV, which is why they cannot be used in spectroscopy in the UV range. Readings with UV light are generally done with quartz cuvettes, which show little UV absorbance. They are expensive, however, and certainly not disposable.
Can cuvettes used for visible spectrophotometry be made of plastic?
While cuvettes can be made of various materials, plastic cuvettes have the advantage of being less expensive and disposable and are often used in fast spectroscopic assays. Plastic cuvettes are used in the visible range for colorimetric assays and the UV range for DNA, RNA, and protein analysis.
Which is the most sensitive detector for spectrophotometer?
Photomultipliers
Photomultipliers have high sensitivity for UV and visible radiation and have fast response times. However, they are susceptible to damage when exposed to high intensity light. Photomultiplier tube is inherently more sensitive than the photo tube.
Can plastic cuvettes be reused?
Do not wipe with paper tissues as they are abrasive and may leave fibre residue and brightening agents on the optical windows. Tap out any air bubbles caught in the solution in the cuvette prior to taking an absorbance reading. It is not recommended to wash and reuse plastic disposable cuvettes.
What happen to cuvette if it is stored wet?
If the cuvettes are stored wet , they may dry with sample material on the measuring surfaces, which will effect subsequent measurements. DO NOT clean your cuvettes in a ultrasonic cleaning bath. The high frequencies used in these baths will damage or even shatter your cuvettes.
What is the proper way to handle a cuvette for use in a spectrophotometer?
Handling of cuvettes
- Handle the cuvettes carefully to avoid breakage.
- Avoid contact with clear sides of cuvettes with any hard surface (to avoid scratches).
- While filling the cuvettes, avoid spillage of the solution on the outer side of the cuvettes.
Why ordinary Pyrex or glass cells are not suitable for UV spectrophotometry?
Because glass will absorb all the UV energy below 280nm. One has to use quartz instead to be able to work until 210nm. You can use glass if working with colored substances but not if you need to work in lower than 280 nm range.
Why reusing of disposable cuvette is not recommended?
Watch out for scratches or small etches on plastic cuvettes, these can affect your absorbance readings. Glass and plastic cuvettes are suitable for use in the visible wavelength range. Quartz cuvettes should be used for measurements in the UV range. It is not recommended to wash and reuse plastic disposable cuvettes.