I am a high school senior and decided to do a project on the essential amino acid composition of varying vegan protein mixtures. I have run into a problem concerning protein purification. One of the vegan protein powder mixtures I have chosen contains 1% fat (it does not really specify on the label but I assume it comes from the hemp seed protein; here is the link to the nutritional label: https://tinyurl.com/4fkymstf). My method of analysis is ion exchange chromatography and then light absorbance as seen here: https://tinyurl.com/4n3ukwa2. Can I just ignore the fat and continue to hydrolyze the proteins in 6.0 M HCl or does it actually matter? If it does matter I am going to cry because my only method of extraction is solubility-based (rice protein and hemp seed protein are insoluble in water compared to pea protein so I would have to do some alkaline solution BS to make them all soluble and then extract any residue left over from the alkaline additive which makes me sad). Note that I already found a way to extract the sodium on the label.
TLDR: For ion exchange chromatography in regards to amino acid analysis will a small amount of fat contaminant skew results to a significant degree/do I need a 100% pure protein sample?