JASCO | Magnets and Cryostats
· MCD CD Option
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[CD] Circular Dichroism
[CD]Magnetic CD and Cryostats
→ Placing a sample in a magnetic field allows for magnetic circular dichroism (MCD) measurements to be obtained. In protein molecules, MCD can be used as a probe to monitor a chromophore’s local environment. Chromophores with large magnetic moments arising from either rotational symmetries (aromatics, porphyrins), unpaired spins (metal complexes), or both (hemes) are sensitive to electronic perturbations and therefore provide information regarding the molecule’s electronic state. The MCD signal intensity is proportional to the magnetic field strength, which can be applied using either permanent magnets, electromagnets or super-conducting magnets.
· Permanent magnets with field strengths up to 1.6 tesla at ambient temperature
· Electromagnets with field strengths up to 1.5 tesla
· Superconducting magnets with field strengths of 8 tesla
1. MCD-581 | Electromagnet
Measure magnetic hysteresis and MCD spectra in a continuously variable field from -1.5 to 1.5 tesla. This magnet has a pole gap of 15 mm and a pole diameter of 21 mm. A regulated DC power supply unit is used to control the magnetic field strength.
The magnet requires cooling water ( minimum of 5 L/min ) usually provided by a circulator system. Sample temperature can be maintained with an optional water-jacketed cell holder, which accommodates 10 mm cells. included. Optionally low-temperature cryostats ( CRYS-582 and CRYL-583 ) are also available.
2. PM-491 | Permanent Magnet
Measure MCD spectra in a fixed magnetic field of + or -1.6 tesla, according to the orientation. With a weight of only 5.9 kg, this accessory can easily be placed in and out of the standard sample compartment.
The magnetic field is easily reversed by turning the magnet 180º. This magnet accommodates 5 mm path length rectangular cells as standard. Optional holders are available for cells with 1 mm or 2 mm path lengths.
3. CRYS-582 | Liquid Nitrogen Cryostat for Liquid Samples
This cryostat is for solid samples up to 10 mm in diameter and has a temperature range from ambient down to -180ºC
4. CRYS-583 | Liquid Nitrogen Cryostat for Liquid Samples
For liquid samples, this cryostat has a temperature range from ambient down to -150ºC. Rectangular cells with path lengths up to 5 mm can be used.
*Note : For both cryostat, temperature control is achieved with the TC-22HK2 Temperature Controller and a vacuum pump is necessary for adequate insulation of the sample holder unit and the liquid nitrogen vessel ( 2L capacity )
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