Covid-19 and smart beta: A case study on the role of sectors.

We investigate the role of sectors on the performance of smart beta products during the COVID-19 crisis. Cross-sectional differences in excess returns (versus a market capitalized portfolio) are driven by strong exposures to COVID-19-related industry rotation, rather than to long-term structural causes.

Separation of small peptides by electrochromatography on silica-based reversed phases and hydrophobic anion exchange phases.

Peptide separations are regarded as a promising application of capillary electrochromatography (CEC) and, at the same time, a suitable model to elucidate its mixed separation mechanism when charged analytes are involved. In this paper, studies on the separation of small peptides (2-4 amino acids) on a Spherisorb octadecyl silane (ODS) phase at acidic pH and on a strong anion exchange (SAX)/C18 mixed mode phase at weakly basic pH are reported. For the ODS phase a comparison of CEC, capillary zone electrophoresis (CZE) and high-performance liquid chromatography (HPLC) under identical buffer/eluent conditions is presented.