Application Notes
 This section contains various aplpication notes related to PTI equipment. All application notes are in downloadable PDF format.
This study shows that the liquid and crystalline states of cholesterol can be distinguished by Raman using the ProVector solution from PTI. This preliminary study illustrates the power of the ProVector system as an important tool for biomedical research. Studies are underway to more specifically isolate these liquid state transitions and to elucidate their dependency on acyl chain length. The study shows how the robust nature of the Raman spectral changes of CE will provide a strong basis for analyzing this lipid in disease states.
The PTI VectorMaster series offers the ability to analyze organic liquids and solvents including alcohols in aqueous solution at low concentrations. The new high resolution model, The ProVector HR provides coverage from 150-2000 cm-1 with clear well-resolved peaks even for important C-Cl bonds such as those in chloroform and methylene chloride. The spectral differences between various grades of gasoline allow for quick identification.
Polyethyene terephthalate (PET) is widely used in plastics packaging with major applications that include plastic films used to manufacture water and soft drink bottles and microwave cake pans and containers. Crystallinity is introduced into PET both by the melting and shape-cooling process and during deformation to create products. In turn, the deformability of PET during the manufacturing process and the capacity to maintain product shape after reheating, as in the microwave applications, depends heavily on percent crystallinity of the PET material. The major methods to used analyze crystallinity, differential scanning calorimetry (i.e., heat of melting) or density, are slow off line methods. This application paper presents data to show how dispersive Raman can be used to rapidly obtain quantitative data on PET crystallinity for use in on-line applications.
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