The AAS is pleased to announce the winners of this year’s prize competitions and offer congratulations to all honorees. Please join us at the Awards Ceremony during the AAS 2026 Annual Conference in V...

Alt: Minority Report Dont Think Of Them Aas Human GIF

What happens right before a massive star explodes violently in a supernova explosion? A recent study predicts an influx of pre-explosion observations will arise after the Vera C. Rubin Observatory tur...

ALT: Minority Report Dont Think Of Them Aas Human GIF

Here at the AAS Secretariat, we are thrilled by the success of the AAS 2026 Annual Conference in Vancouver, Canada. More than 3,900 attendees joined us from March 12 to 15, on a program that included nearly 600 organized panels, workshops and roundtables; 72 poster presentations; 4 pre-conference workshops; 77 exhibitor booths; 24 film screenings; […]

Amino acids (AAs) are considered as the building blocks of life. Unlike nonessential AAs, the human body cannot synthesize essential AAs and should be supplied in food or dietary supplements. The aim of the work is simultaneous HPLC-UV determination of 10 structurally related AAs without pre- or postderivatization in powdered dietary supplements (PDSs). This was challenging, especially because PDS has no standardized procedures for its quality control. HPLC-UV chromatograms of the 10 AAs were recorded using a gradient elution of the mobile phase on a CLC-C18 column at 225 nm. The elution started with 100% of phosphate buffer (pH 7.4, 10 mM) for 10 min; then, the concentration of acetonitrile increased linearly to reach 50% for another 15 min at room temperature. Good separation was achieved within a 25 min run time without pre- or postderivatization. The method was carefully validated according to the ICH guidelines over the linearity range of 100–200, 50–200, 20–150, 50–400, 20–250, 75–175, 50–250, 50–250, 50–300, and 5–100 μg/mL for l-lysine, l-threonine, l-histidine, l-valine, l-methionine, l-isoleucine, l-leucine, l-tyrosine, l-phenylalanine, and l-tryptophan, respectively, with mean recoveries ranges between 98.91 and 100.77. The method was found to be precise, and the relative standard deviation (RSD) was found to be between 0.28 and 1.92 with recoveries between 97.91 and 101.11. The method was found to be robust that resists deliberate changes in pH, flow rate, and mobile-phase percentages. It was successfully applied for the analysis of PDSs. The proposed method could be very useful for the quality control of the 10 structurally related AAs during their synthesis and for testing raw materials and pharmaceutical preparations.

Call for Pre-Conference Workshops (NEW 2025) The AAS 2025 Annual Conference Program Committee seeks proposal submissions for pre-conference workshops. The goal of pre-conference workshops is to provid...

Astrobites reports on the use of Johannes Kepler’s pre-telescope sunspot drawings to re-examine irregular solar activity in the 17th century.