Commercially available solid (powder) reference samples of:
cholesterol (Sigma), melanine from
Sepia officinalis (Sigma), mannan from
Saccharomycs cerevisiae (Sigma),
DNA from salmon testes (Sigma),
RNA from torula yeast (Sigma), galactoseamine (Merck), N-acetyl galactoseamine (Merck), soy phospholipids (Merck), as well as building blocks of DNA and RNA, i.e.,
uracil (Merck), thymine (Koch),
adenine (CHR),
guanine (Sigma), and
cytosine (Sigma) were all analyzed at room temperature, without further purification, and after gentle homogenization in a mortar.
Lysogeny Broth (LB) was prepared by adding 10 g/L of Tryptone (Fluka Analytics), 1 g/L of
select yeast extract (Sigma life science), 8 g/L of
NaCl (≥99.5% purity, Sigma-Aldrich Chemie GmbH), 0.3 g/L of CaCl
2 (97% purity, Fluka Analytics), 1 g/L
Dextrose (Biotechnology grade, Amresco) and 2 mg/L Streptomycin (Fluka Chemie GmbH) in ultra-pure water.
The virus dilution buffer (i.e phosphate buffered saline, PBS) was prepared by adding 0.78 g/L NaH
2PO
4 2H
2O (≥98.0% purity, Sigma-Aldrich Chemie GmbH, Steinheim, Germany) and 0.58 g
NaCl (≥99.5% purity, Sigma-Aldrich Chemie GmbH, Steinheim, Germany) in ultra-pure water. The pH was equilibrated to seven using
NaOH (≥99% purity, Carl Roth GmbH, Karlsruhe, Germany) and
HCl (ACS reagent grade, Sigma-Aldrich, Buchs, Switzerland).
Shchukarev A., Backman E., Watts S., Salentinig S., Urban C.F, & Ramstedt M. (2021). Applying Cryo-X-ray Photoelectron Spectroscopy to Study the Surface Chemical Composition of Fungi and Viruses. Frontiers in Chemistry, 9, 666853.