Spectroscopic methods for quantifying peptides/proteins with or without Tryptophan or Tyrosine content

I have several peptides (20-50 amino acids long) which I want to quantify the solubility/concentration in a solvent at certain temperature and pH.


These peptides may or may not contain Tryptophan or Tyrosine (aromatic residues) in them.
What's the preferred quantification method for it?


I came to UV-Vis method (e.g. [**NanoDrop**](https://www.thermofisher.com/jp/en/home/industrial/spectroscopy-elemental-isotope-analysis/molecular-spectroscopy/ultraviolet-visible-visible-spectrophotometry-uv-vis-vis/uv-vis-vis-instruments/nanodrop-microvolume-spectrophotometers/nanodrop-protein-quantification.html)) and Fluorescence method (e.g. **[Qubit](https://www.thermofisher.com/order/catalog/product/Q33211)**).
Do those methods strictly require the presence of Tryptophan or Tyrosine?


