下面是MicroCal公司的VP-DSC的介绍
Features include:
Fixed-in-place cells for reproducible ultrasensitive performance with low maintenance
Active cell volume ~ 0.5 ml
Cells fabricated from Tantalum 61? which has excellent chemical resistance properties
Operating temperature range of ?0篊 to +130篊
Internal Peltier mechanism ?no external heating or cooling required
User selectable scan rates in the range of 0篊 to 90篊 per hour (upscan)
Unparalleled sensitivity and reproducibility (Figure 3)
User selectable response times for maximum performance
Allow studies of fast or slow transition processes
As little as 12.5 micrograms protein can be used to determine thermodynamic parameters
Self-contained pressurizing system (0-45 psi) for scanning solutions above their boiling point
PPC accessory permits volumetric studies of biopolymers in solution
Solid sample insert kit is available for the study of powders, crystals, and other solid samples
The VP-DSC is an ultrasensitive differential scanning microcalorimeter that uses a cell-feedback network (CFB) to differentially measure heat produced or absorbed between sample and reference cells. Cell design is similar to the VP-ITC (Figure 2).
The VP-DSC was the first calorimeter to feature user-selectable modes of operation: high gain, low gain, and passive. Passive mode is most sensitive and is used to scan broad transitions (e.g. proteins), and the high gain mode is recommended for sharp transitions (e.g. lipids)