# Increasing quality stability of jasmine tea beverage by encapsulation from protein-polysaccharide nanocomplexes

## TL;DR

This study shows that adding WPI-β-CD improves the stability and quality of jasmine tea beverages during storage.

## Contribution

The novel use of WPI-β-CD nanocomplexes to enhance tea beverage stability is demonstrated.

## Key findings

- Tea beverages are more stable under neutral and acidic conditions than under alkaline conditions.
- WPI-β-CD addition delayed tea polyphenol degradation by 6.41% after 150 days of storage.
- Higher storage temperatures reduced the stability of tea beverages.

## Abstract

As widely consumed beverage, the stability is crucial to the quality and shelf life of tea beverage. In this study, whey protein isolate (WPI)-beta-cyclodextrin (β-CD) was added to investigate its effect on the stability of jasmine tea beverage by pH, thermal and storage stability. The results showed tea beverages under neutral and acidic conditions are more stable than those under alkaline conditions, and have higher antioxidant activity and total phenol retention rate. The storage stability experiments (25 °C for 30 d, and 4 °C for 150 d) showed the higher the storage temperature, the less stable the tea beverages were. WPI-β-CD addition was beneficial to delaying the degradation of tea polyphenols in the tea beverages, delayed by 6.41% after 150 d of storage. This study provides a theoretical basis for the development of new tea beverage products and the wide application of EGCG.