Chemical imaging of protein hydrogels undergoing alkaline dissolution by CARS microscopy

Binqian Xu, Xiao Dong Chen, Ruben Mercadé-Prieto

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Hydrogels swell, shrink and degrade depending on the solution they are in contact which, strongly affecting their performance. The minimum information needed to validate many published simulations would be the spatial quantification of the solute material with time. In this study we develop a simple methodology to quantify the protein content in heat induced protein hydrogels using a commercial Coherent anti-Stokes Raman Spectroscopy (CARS) microscope. The system is used to quantify the whey protein isolate (WPI) concentration in hydrogels undergoing dissolution at alkaline pH. Quantitative measurements were performed in hydrogels up to depths of ∼600 µm, with an average accuracy of ∼1 wt%. Results show that the protein concentration within the swollen layer is constant with time, confirming the existence of steady state conditions during dissolution. The methodology presented can easily be implemented to other biopolymer hydrogels and foods.

Original languageEnglish
Pages (from-to)16-21
Number of pages6
JournalFood Chemistry
Volume252
DOIs
Publication statusPublished - Jun 30 2018
Externally publishedYes

Fingerprint

Raman spectroscopy
Hydrogels
Raman Spectrum Analysis
hydrocolloids
Microscopy
microscopy
Microscopic examination
Dissolution
image analysis
Imaging techniques
Proteins
proteins
Biopolymers
whey protein isolate
biopolymers
microscopes
Contacts (fluid mechanics)
solutes
Microscopes
Hot Temperature

Keywords

  • CARS
  • Hydrogels
  • Microscopy
  • Protein quantification
  • Swelling

ASJC Scopus subject areas

  • Analytical Chemistry
  • Food Science

Cite this

Chemical imaging of protein hydrogels undergoing alkaline dissolution by CARS microscopy. / Xu, Binqian; Chen, Xiao Dong; Mercadé-Prieto, Ruben.

In: Food Chemistry, Vol. 252, 30.06.2018, p. 16-21.

Research output: Contribution to journalArticle

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