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PEAQ-DSC

Gold standard protein stability analysis for research applications

The PEAQ-DSC system, a MicroCal technology, provides highly sensitive, easy-to-use microcalorimetry that helps reduce the time and cost associated with stability testing and comparability analysis. The PEAQ-DSC is a manual instrument with a cleaning device, which can be upgraded to an automated version upon request.

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Overview

The high-sensitivity MicroCal PEAQ-DSC system features automated data analysis to support the generation of high-integrity thermal stability data and deliver compliance with regulatory requirements, whilst allowing easy integration into existing data handling and transfer systems.

Unattended operation of the instrument after sample loading frees operator time. This complete system requires no additional accessories, reagents or consumables.

The PEAQ-DSC Automated, with an autosampler, is also available.

Features

  • Gold standard stability-indicating technique requiring minimal assay development

  • Direct and label-free quantification of biomolecular native-state stability in solution 

  • Measurement of very tight binding constants, up to 1020 M-1

  • Manual system with pipette and cleaning device

  • Powerful MicroCal PEAQ-DSC software minimizes typical data analysis time

Data and software

Data generated by the MicroCal PEAQ-DSC provides critical guidance for biopharmaceutical development in protein engineering, (pre)formulation development, process development, manufacturing change control and biosimilarity and biocomparability studies. 

The integrated software streamlines workflows, facilitates non-subjective data analysis, performance qualification and compliance with 21 CFR Part 11 and Annex 11 regulations, all delivering high integrity data and driving productivity in biopharmaceutical research.

Powerful MicroCal PEAQ-DSC software minimizes typical data analysis time and includes:

  • PEAQ-Compliance: The system is available with Malvern Access Controller (MAC) to limit access to user-defined SOPs and data analysis features. Data can be displayed using the Report Generator with user details and the ability to sign using electronic signatures to facilitate the integration of the workflow into your company’s quality system and aid compliance with 21 CFR Part 11 and Annex 11 regulations. This is provided as an optional accessory
  • PEAQ-Performance: Automatically detects and validates system readiness for optimal performance
  • PEAQ-Smart (including PEAQ-Finder): For SOP-based operation and data analysis.  Provides new algorithms to detect even subtle peaks and shoulders, facilitating the automatic, non-subjective identification of multiple transitions, such as those seen in multi-domain proteins
  • PEAQ-Compare: For the quantitative comparison of DSC traces for comparability studies, ideal for batch-to-batch and biosimilarity studies
  • Network-ready: email updates sent during the analysis to keep you informed of assay progress

What is DSC?

Differential Scanning Calorimetry (DSC) is a powerful analytical tool for characterizing the thermal stability of proteins and other biomolecules. The technique measures the enthalpy (ΔH) and temperature (Tm) of thermally-induced structural transitions of molecules in solution. This information provides valuable insights into factors that stabilize or destabilize proteins, nucleic acids, micellar complexes and other macromolecular systems. 

The data are used to predict shelf-life of biomolecular products including biopharmaceuticals, to enable batch-to-batch and biosimilar versus innovator molecule comparisons, to develop purification strategies, to characterize and evaluate protein constructs, and to rank the affinities of ligands to their protein targets in small molecule drug discovery programs.

Data analysis and measured/derived parameters are described in greater detail on the Differential Scanning Calorimetry technology page.

How it works

Functional structures formed by proteins and other macromolecules often undergo temperature-induced conformational changes, such as unfolding. These changes result in the absorption of heat as a result of the redistribution of non-covalent bonds within the molecule. Differential Scanning Calorimeters measure this heat uptake very precisely.

The thermal core of the PEAQ-DSC system contains a sample cell (containing the sample of interest) and a reference cell (containing a matched buffer solution), both of which are housed within an insulating jacket. These two cells are always maintained at the same temperature, and during a measurement, they are heated at a constant scan rate. 

As the molecule within the sample cell unfolds, heat is absorbed, creating a temperature difference (ΔT) between the sample cell and the reference cell. This results in a thermal gradient across the Peltier units, creating a proportional voltage, which is in turn converted to power to form a feedback loop to the Peltier units, in order to return ΔT to zero.

Since protein unfolding is an endothermic event, it is observed as a positive displacement in the thermogram. The midpoint of this protein ‘melting’ transition is the Tm, and the area under the curve is the enthalpy (ΔH) of the unfolding process.

Applications

MicroCal PEAQ-DSC instruments provide value to a wide range of applications, some of which are outlined below.

Protein Characterization 

MicroCal PEAQ-DSC is a fundamental tool for characterizing proteins. Key questions such as below can all be answered in simple DSC experiments.

  • Is my protein folded?
  • In what conditions is my protein stable?
  • Is the protein multi domain?
  • Does my protein bind a ligand or cofactor?

Webinar: The Power of Heat: Digging Deeper with Differential Scanning Calorimetry to Study Key Protein Characteristics 

Webinar: Value of DSC in characterization and optimization of protein stability as compared to other thermal stability assays

Liposomes

Liposomes are used as model membrane systems and as potential drug delivery systems. ‘Structure Activity Relationships’ (SAR) of membrane components and drug uptake into a liposomes can be investigated monitoring shifts in the phase transition temperatures and enthalpies measured by DSC. Indeed, any material that forms micelles or other macromolecular structures can be studied using the technique.

Webinar: Good practice for studying the stability of liposomes, their use as model systems and in drug delivery

Application note: Using DSC to characterize thermotropic phase transitions in lipid bilayer membranes: The basics of liposome sample preparation and DSC studies 

Specification

General

Technology Differential Scanning Calorimetry
Measurement type
Temperature midpoint (TM)
Enthalpy (ΔH)
Heat capacity change (ΔCp)

Cell

Cell Capillary
Cell material Tantalum
Cell volume 130 μL

Sample

Sample volume 250 µL (manual filling)
Typical sample concentration 0.01 mg/mL – 10 mg/mL 1
Sample throughput ≤ 6 samples analyzed/8h

System

Noise 0.05 μCal/°C 2
Baseline repeatability 1 μCal/°C 2
Response time 5 s2
Repeatability <0.2 µCal/°C 3
Reproducibility <0.08°C St. Dev. TM and <2% RSD on ΔH 4
System reproducibility <0.1°C St. Dev. TM and <5% RSD on ΔH 4
Multiple feedback modes Yes (passive, high gain and low gain)
Temperature range 2 - 130 °C 2,5
Maximum scan rate 240 °C/h
Reverse scanning Yes
Pressure perturbation calorimetry (PPC) N/A - manual cleaning device with guided workflows
Cleaning solvents Water and detergent (Contrad 90) used as standard

Software

21 CFR part 11 Yes, with PEAQ-Compliance software option
Network ready Yes, with email alert capability

Operating environment

Operating temperature (°C) +10 °C to +28 °C
Storage temperature -20 °C to +50 °C
Humidity 10% to 70%, non-condensing (10% to 90% for storage)
Ingress Protection (IP) rating IP21
Power 100-240 V A/C, 50/60 Hz, 70 W (cell), PC as supplied
Certification CE (EN61010-1), EMC (EN61326-2-1, EN61326-1, FCC, ICES, VCCI), ISO9001:2008

Weight and dimensions

Dimensions (W, D, H) 20 cm × 44 cm × 19 cm
Weight 8.2 kg

Notes

1 Sample dependent
2 Typical results for ribonuclease (RNase) in 50 mM KAc buffer at pH 5.5, at 60 °C/h with high feedback
3 Rescans of a stable buffer
4 Using ribonuclease (RNase)
5 Range may be extended down to -10 °C upon request

User manuals

Software downloads

25 October 2021

2.21

Malvern Access Configurator (MAC) software
  • Security and maintenance release. See SUN for details.
2.21

26 June 2018

2.20

Malvern Access Configurator (MAC) software
  • Searching and exporting the audit history
2.20

05 September 2017

2.10

Malvern Access Configurator (MAC) software
  • Initial release
2.10

05 July 2023

1.64

Maintenance release

1.64

09 September 2022

1.63

Maintenance release

1.63

13 December 2021

1.62

Maintenance release

1.62

02 August 2021

1.61

Maintenance release

1.61

10 May 2021

1.60

Maintenance release

1.60

16 September 2020

1.53

Maintenance release

1.53

20 March 2020

1.52

Maintenance release

1.52

22 August 2019

1.51

Maintenance release

1.51

25 June 2019

1.50

Maintenance release

1.50

08 January 2019

1.40

Maintenance release

1.40

01 February 2018

1.30

Maintenance release

1.30

13 October 2017

1.22

Maintenance release

13 February 2018

1.21

Maintenance release

1.21

04 July 2017

1.20

Initial release of MicroCal PEAQ-DSC software

1.20

Unleash the full potential of your Malvern Panalytical solution

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Unmatched uptime and performance


Malvern Panalytical instruments are built to last and good maintenance and care ensure continued peak performance for many years to come.

Service Agreements build this into your schedule and budget, based on preventive maintenance and remote support. Different levels include repair visits, response times and parts coverage as needed. OQ services, training and application consultancy can be added as well.

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Service Agreements
Find out more about our service agreement options tailored for you
Learn more >>

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Advanced analysis and actionable insights


  • Basic User Training: Master the art of optimal PEAQ-DSC usage and determine whether your measurements, sample preparation, and data are accurate and reliable – all while uncovering invaluable maintenance tips and tricks.  Find your online or offline classroom training course.
  • Customized Application Training: A training journey personalized to your application needs, covering aspects from sample taking and method development to data and results interpretation. Our application scientists share in-depth theory and best practices to make sure you’re getting the most out of your PEAQ-DSC measurements and instruments.
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Easy start and streamlined routine operations


  • Setting up for success: Our PEAQ-DSC onboarding starts with our expert support engineers on-site. A comprehensive warranty and a starter training program are complimentary, so you can get straight to your important analyses.
  • Software and Manuals: Easily find manuals and our latest software versions online to benefit from new features and to stay up to date.
  • Webinars and App Notes: Access a comprehensive catalog of resources, such as recorded webinars, white papers, and app notes to support your analytical journey. 
  • Parts and Consumables - MyStoreOur online store makes access to your parts, consumables, accessories, and software convenient and efficient. Check availability and pricing, self-service quotes and order on card or account, 24/7. 
  • Support Portal: Our professional service team is ready to assist you – fast-track your service request on  Malvern Panalytical My Customer Support Portal or view your system details and service history at a glance.
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Want to speak to a service expert or find the services that are just right for you?


Reach out to our experts and evaluate your services needs and business risks by answering a few questions around the usage of your Malvern Panalytical instrument.


Contact Service Team

*Please note that the exact details of our services and their availability are determined by a variety of customer-specific factors, such as product type, product configuration, or location.

The Gold Standard for structural stability analysis

The Gold Standard for structural stability analysis

Powerful characterization tools for characterization of the thermal stability of proteins and other biomolecules in biopharmaceutical development, manufacture and beyond. Simple to use, requires little assay development, and needs no labeling or immobilization.

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