26 下列那一個胺基酸不會吸收波長為280 nm的紫外光，因此對蛋白質的莫耳吸光係數（molar extinction coefficient）貢獻很小？
苯丙胺酸（phenylalanine） 天冬醯胺（asparagine）
酪胺酸（tyrosine） 色胺酸（tryptophan）

answer is asparagus!!!!! heheheheh
http://www.bio.cmu.edu/courses/03231/LecF04/Lec04/lec04.html


Spectral properties of amino acids Trp, Tyr, and Phe contain conjugated aromatic rings. Consequently, they absorb light in the ultraviolet range (UV). The extinction coefficients (or molar absorption coefficients) of these three amino acids are:

Amino acid
Extinction Coefficient e (lmax)
Trp

5,050 M-1cm-1 (280 nm)
Tyr

1,440 M-1cm-1 (274 nm)
Phe

220 M-1cm-1 (257 nm)

this question is actually asking the other way around:

memo these 3: with aromatic ring:

Phe, tyr, trp