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

. 2020 May 28;25(11):2522. doi: 10.3390/molecules25112522

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

© 2020 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

Classification plots of the handheld spectrometer for adulterant concentration levels ((A), optical glass, and (B) commercial low density polyethylene (LDPE) plastic bag) using the entire dataset and single mixture combinations ((C), optical glass, and (D), commercial LDPE plastic bag) using the data of samples containing single adulterants and pure whey protein powder. U = urea, G = glycine, T = taurine, M = melamine. Spectral pre-processing: Savitzky-Golay smoothing and multiplicative scatter correction (MSC).