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Displaying 1-5 of 8 results for Tag: AminoPac PA10

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AU152: An Improved Gradient Method for the AAA-Direct™ Separation of Amino Acids and Carbohydrates in Complex Sample Matrices

Instrument Type: IC

In this Application Update, we combine into a single method individual improvements made to the standard AAA-Direct gradient program. These individual improvements are now in the AAA-Direct manual. This update shows that such combined changes to the AAA-Direct method improve the performance of our previously published method. This new method successfully determines amino acids in yeast extract-peptone-dextrose yeast culture medium (YPD Broth), and Dulbecco’s modified Eagle’s (with F-12), M199, L-15 (Leibovitz), and McCoy’s 5A media for mammalian cell culture.

TN55: Screening of Sample Matrices and Individual Matrix Ingredients for Suitability in AAA-Direct

Instrument Type: IC

In this technical note, we describe a procedure to screen sample matrices for their effect on peak area, peak height, and retention time. We demonstrate this procedure by testing ethanol for possible interferences in AAA-Direct. However, the method described here can also be used to evaluate any matrix component analyzed by chromatography with electrochemical detection. In this technical note, we use the term test sample (TS) to describe the specific test compound evaluated for possible interferences.

TN50: Determination of the Amino Acid Content of Peptides by AAA-Direct

Instrument Type: IC

This Technical Note describes the peptide hydrolysis procedures that lead to successful determinations of amino acid composition using AAA-Direct. Results for the amino analysis of two peptides, Melanocyte Stimulating Hormone (MSH) and Luteinizing Hormone-Releasing Hormone (LH-RH), using both hydrochloric acid and methanesulfonic acid (MSA) as hydrolyzing reagents are presented to demonstrate the performance of this method.

AN130: Identification of a Hydroxylysine-ContainingPeptide Using AAA-Direct

Instrument Type: HPLC (Biocompatible)

This application note shows that AAA-Direct can be used to determine peptides with lysine hydroxylation. All common amino acids, including hydroxylysine (Hyl), were separated by AAA-Direct, and the presence or absence of Hyl in the fractions confirmed peak identities. The techniques described in this application note show several ways that peptides can be evaluated for identity and purity, how peptides can be desalted, and how much desalting is needed for successful AAADirect amino acid analysis.

AN163: Determination of Protein Concentrations Using AAA-Direct.

Instrument Type: HPLC (Biocompatible)

In this application note, we describe a method to determine total protein using AAA-Direct. We used this method to participate in an Association of Biomolecular Resource Facilities (ABRF) Amino Acid Analysis Research Group collaborative study that compared total protein determinations using AAA to dye-binding assays. We found that concentrations of all five protein solutions determined by AAA-Direct were equivalent to the determinations made by participants that used either pre- or postcolumn derivatization methods.