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bliss-vitamin-c-peptide Sigma AQUA Peptides: Precision Quantitation in Proteomics

When researchers require precise and reliable protein quantitation, sigma AQUA peptides offer a powerful solution. Developed in collaboration with the Protein Quantitation Consortium, AQUA™ peptides are specifically designed for accurate, efficient mass spectrometric quantitation of proteins. This methodology allows scientists to determine the absolute amount of a target protein within a sample, moving beyond relative expression levels to provide concrete quantitative data essential for biomarker discovery and validation.

The core principle behind AQUA peptides lies in their use as internal standards. These peptides are chemically synthesized and incorporate stable isotope-labeled amino acids, giving them a slightly increased molecular weight compared to their native counterpartsStable Isotope Labeling Strategies. Because AQUA peptides are chemically indistinguishable from the native peptides they are designed to quantify, they behave identically during sample preparation and mass spectrometry analysisColumn: SunShell RP-AQUA2.6 µm, 100 x 1.0 mm. Mobile phase: A) 0.1 % trifluoroacetic acid (TFA) in water. B) 0.08 % trifluoroacetic acid (TFA) in .... However, their distinct mass allows for clear differentiation and precise measurement.Peptides inducing an immune response against copepods ... This strategy enables the absolute quantification of not only specific protein expression but also specific amino acid modifications, providing a deeper understanding of biological processes.Developed in collaboration with the Protein Quantitation Consortium,Sigma's AQUA Peptidesenable accurate, efficient mass spectrometric quantitation of protein ...

The AQUA Peptide Strategy for Absolute Quantification

The AQUA peptide strategy is a cornerstone of targeted proteomics, enabling researchers to move from biomarker discovery to validation with confidencePeptides. By spiking a known quantity of a stable isotope-labeled AQUA peptide into a biological sample, scientists can establish a calibration curve.Sample preparation for mass spectrometry When the sample is analyzed by mass spectrometry, the ratio of the native peptide signal to the AQUA peptide signal directly correlates to the absolute amount of the target protein present. This method is analogous to quantitative PCR (qPCR) for nucleic acids, offering a similar level of precision for protein analysis.Custom AQUA Peptides; Products, Next higher product group, peptide service ; Period, Status, 2005-04-26 sales start ; Organisation, Sigma-Aldrich Corporation ( ...

This approach is particularly valuable for studies involving protein biomarkers. The ability to accurately measure protein levels facilitates focused research as scientists progress through different stages of investigation. For example, Custom AQUA peptides can be synthesized with challenging sequences or unusual post-translational modifications, expanding the scope of quantitative proteomics. These custom peptides are often available in small, convenient package sizes, such as 5 x 1 nmol, to facilitate sample preparation and ensure appropriate quantities for experimental needs.

Applications and Advantages of AQUA Peptides

The utility of sigma AQUA peptides extends across various research fields. In proteomics, they are instrumental for quantitative mass spectrometric studies, allowing for the precise measurement of protein biomarkers and their modifications. This is crucial for understanding disease mechanisms, monitoring treatment responses, and developing diagnostic tools. The Protein-AQUA strategy, for instance, facilitates focused, quantitative studies of specific protein expression and amino acid modifications.

Furthermore, the synthesis of AQUA peptides allows for the introduction of specific amino acid modifications, such as phosphorylation or ubiquitination.Custom AQUA Peptides; Products, Next higher product group, peptide service ; Period, Status, 2005-04-26 sales start ; Organisation, Sigma-Aldrich Corporation ( ... This capability is vital for studying the regulation of protein function and signaling pathways. By quantifying these modified peptides, researchers can gain critical insights into cellular processes that are otherwise difficult to assess. The development of custom AQUA peptides by companies like Sigma-Aldrich has further enhanced the accessibility of this powerful technology, enabling researchers to tailor peptide standards to their specific experimental requirements.

Considerations for Using AQUA Peptides

While AQUA peptides offer significant advantages, there are practical considerations for their use. The synthesis of these labeled peptides can be more expensive than unlabeled peptides, but this cost is often justified by the high accuracy and quantitative power they provide. Researchers must ensure they select or synthesize the correct AQUA peptide that precisely corresponds to the target peptide sequence in their protein of interest.AQUA Peptides | Cell Signaling Technology

It is also important to note that while AQUA peptides are a well-established technology, specific products may be discontinued. In such cases, contacting technical service for assistance or exploring custom synthesis options is advisable. The availability of resources like custom AQUA peptide synthesis services ensures that researchers can continue to leverage this essential tool for their quantitative proteomics needs. The partnership programs and collaborations surrounding AQUA peptides highlight the ongoing commitment to advancing quantitative mass spectrometry in biological research.