PIKE Technologies, Inc

Articles

ATR–FT-IR Investigation of the Ocean Surface

November 10, 2016

Ocean microbiological activity of chemical species present in the sea surface microlayer was investigated using ATR-FTIR spectroscopy. We observe chemical differences before and during the peak of an induced phytoplankton bloom.

Simple Method for Monitoring Protein Secondary Structure during Thermal Unfolding and Aggregation

March 16, 2016

Protein secondary structure during thermal unfolding and aggregation is readily acquired using IR spectroscopy and a temperature-controlled Mid-IR transmission accessory.

Simple Method for Monitoring Protein Secondary Structure During Thermal Unfolding and Aggregation

February 01, 2016

As the temperature increases, significant changes in the myoglobin secondary structure are observed. Between 25 °C and 70 °C, the 1649 cm-1 peak height decreases and linewidth increases. These changes in the amide I band reflect increased protein structural disorder. A temperature increase from 70 °C to 75 °C causes a drop in the 1649 cm-1 band intensity. Simultaneously, two peaks grow in at 1683 and 1637 cm-1. These changes indicate conversion of random coil/α-helix to intermolecular β-sheet. Further conversion to β-sheet is observed as the temperature rises to 90 °C. The final β-sheet structure is an insoluble aggregate. This aggregation process is not reversed when the temperature is driven back to 25 °C.

Infrared Transmission Measurements of Diffuse Samples

November 03, 2015

An infrared transmission spectrum of lens tissue was collected and compared with a sample spectrum collected in the FT-IR sample compartment. Benefits of using an integrating sphere are discussed.

Infrared Transmission Measurements of Diffuse Samples

September 01, 2015

Measuring the transmission of diffuse samples such as paper or filled polymer films requires an integrating sphere to obtain accurate transmission values and useful chemical information, because the IR light is scattered as it passes through the sample. An integrating sphere serves as a collection device for the scattered light.

Expanded Spectral Range Germanium ATR Crystal

September 01, 2012

Experimental data show the crystal dimensions of an ATR-FT-IR sampling accessory influence the usable spectral range. An expanded range germanium crystal is introduced for the measurement of high refractive index samples.

Rapid Micro-Sampling by ATR/FT-IR

September 01, 2009

In ATR/FT-IR, magnified visual monitoring of a sample benefits many applications. For micro-sampling and defect analysis, viewing capabilities decrease overall measurement time by allowing the user to locate the desired sampling area quickly and enhance confidence in the collected data by assuring the sampling point. Visual changes in the sample also may be easily monitored during testing. As an example application, the ease of micro-sampling is shown through fiber analysis and the results are discussed.