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Another perspective to explain green tea cream: Utilizing engineered catechin-caffeine complex.

Gang Zhang1, Yanyan Cao1, Sifan Mei1

  • 1Department of Tea Science, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou, China.

Food Research International (Ottawa, Ont.)
|July 15, 2022
PubMed
Summary

Green tea cream formation involves complex interactions between catechins (CATs) and caffeine (CAF). Understanding these molecular interactions, including hydrogen bonds and pi-stacking, is key to preventing undesirable precipitates and improving tea flavor.

Keywords:
CaffeineCatechinComplexationGreen tea creamMolecular interaction

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Area of Science:

  • Food Chemistry
  • Biochemistry
  • Materials Science

Background:

  • Green tea cream, a precipitate in cooled green tea, negatively impacts flavor.
  • Understanding the complexation between green tea catechins (CATs) and caffeine (CAF) is crucial for explaining this phenomenon.

Purpose of the Study:

  • To elucidate the mechanism of green tea cream formation.
  • To characterize the complexation between four types of catechins and caffeine.
  • To differentiate the roles of ester and non-ester catechins in precipitate formation.

Main Methods:

  • Dynamic light scattering (DLS)
  • High-performance liquid chromatography (HPLC)
  • Scanning electron microscopy (SEM)
  • Fourier-transform infrared spectroscopy (FTIR)
  • UV-visible absorption spectroscopy
  • X-ray diffraction (XRD)

Main Results:

  • Catechins and caffeine influence each other's microenvironment in aqueous solutions.
  • Guanidine hydrochloride (GH) was found to weaken these interactions in both solution and precipitate phases.
  • The 1:1 complex structure between epigallocatechin (EGC) and caffeine (CAF) was confirmed.
  • XRD analysis identified hydrogen bonds, CH…π, and π…π interactions as key forces in catechin-caffeine complexes.

Conclusions:

  • The study provides a detailed molecular perspective on green tea cream formation.
  • Identified interactions offer insights into controlling precipitate formation and enhancing green tea quality.
  • This research contributes to a deeper understanding of polyphenol-caffeine interactions in food systems.