Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

View full-text article in PMC

. 2021 Jan 5;13(1):147. doi: 10.3390/cancers13010147

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

PMC Copyright notice

Characteristic MS/MS spectra of m/z 188.0707 in a biological sample (green) (a.1) and the L-Tryptophan standard at 3.73 min in ESI + (blue) (a.2) and m/z 203.0824 at 1.27 min in a biological sample (green) (b.1) and the L-Tryptophan standard in ESI− (blue) (b.2). MS/MS spectra revealed the characteristic fragmentation pattern of L-Tryptophan both in ESI+ and ESI−.

Characteristic MS/MS spectra of m/z 188.0707 in a biological sample (green) (a.1) and the L-Tryptophan standard at 3.73 min in ESI + (blue) (a.2) and m/z 203.0824 at 1.27 min in a biological sample (green) (b.1) and the L-Tryptophan standard in ESI− (blue) (b.2). MS/MS spectra revealed the characteristic fragmentation pattern of L-Tryptophan both in ESI+ and ESI−.