Best Practice for Nucleic Acid Thermal Stability Measurements Using the Cary 3500 UV-Vis Spectrophotometer - Thermal melt (Tm) analysis using rapid, precise temperature-dependent UV-Vis absorbance measurements
UV-Vis spectrophotometers have been used widely for nucleic acid quantification and quality control (QC) utilizing the fact that nucleic acids have a maximum absorbance at 260 nm (1). The concentration of nucleic acids can be easily estimated using the absorbance at 260 nm and the established absorption coefficient. Often a background correction is also performed, for example collecting a baseline using a solution containing everything but the nucleic acid or by measuring the absorbance at a wavelength that nucleic acids do not absorb. Double stranded nucleic acids are bound by hydrogen bonds between the base pairs. The temperature at which double stranded nucleic acids denature to become single stranded depends on the: – sequence and length of the nucleic acid – the pH and buffer conditions – and any mismatches in base pairs between the two strands As such, the melting temperature is very useful analytical tool and can be studied by monitoring the absorbance at 260 nm as temperature is increased or decreased. As the temperature is increased, the hydrogen bonds between the strands are broken and the double stranded nucleic acid separates into two
Are Current Dissolved CO2 Measurement Technologies Good Enough?
November 15th 2024Download Part 2 of the DCO₂ White Paper Series and learn the shortcomings of current measurement technologies. As demonstrated in Part 1, Dissolved CO₂ is a Critical Process Parameter (CPP) in biopharma production processes. However, the sensors currently used to measure and monitor this CPP each have significant drawbacks.
Biopharma Downstream Critical Process Parameters (Nov 2024)
November 15th 2024Download our comprehensive white paper and gain valuable insights into the critical process parameters and advance sensor technologies that can revolutionize your Biopharma Downstream Process (DSP). Discover strategies and techniques to optimize efficiency, improve product quality, and ensure the safety and efficacy of your biopharmaceutical products.
White Paper: Measurement Challenges with Optical Dissolved Oxygen Sensors
November 15th 2024Are you missing sources of measurement error? Measurement of dissolved oxygen (DO) has long been known as a critical control parameter for optimizing cell growth in bioprocesses. Much has been written about different strategies for proper DO control. However, little information has been publicly available regarding optimization of the actual measurement accuracy and reducing common sources of process-related error. Our White Paper aims to divulge these details for the first time.
Cell Density Applications eBook
November 15th 2024Collect More Actionable Data and Optimize Yield with Real-Time Process Adjustments. Learn more how Viable Cell Density Monitoring works for your process in Hamilton’s eBook that features must-see examples of real applications using Hamilton viable cell density monitoring (Incyte) and total cell density monitoring (Dencytee).
