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Effects of green tea contents on the quality and antioxidant properties of textured vegetable protein by extrusion-cooking

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Abstract

The aim of this study was to evaluate the effects of green tea contents (0, 5, 10, and 15%) on texturization and antioxidant properties of textured vegetable protein (TVP) by using a twin-screw extruder. Extrusion conditions were fixed at 140 °C barrel temperature, 50% moisture content, 100 g/min feed rate, and 200 rpm screw speed. The integrity index, hardness, and cutting strength of TVP significantly (P < 0.05) increased with the increase in green tea levels, while cohesiveness, springiness, water holding capacity, and nitrogen solubility index (NSI) significantly (P < 0.05) decreased. Increasing the amount of green tea resulted in better DPPH radical scavenging activity, higher total phenolic, total flavonoid, catechins, and caffeine contents. The (−)-epigallocatechin gallate, (−)-epicatechin, (−)-epigallocatechin, and (−)-epicatechin gallate contents of TVP significantly (P < 0.05) decreased, compared to that of raw materials. The incorporation of green tea in TVP can negatively affect expansion and NSI while positively affect texturization and antioxidant properties.

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Acknowledgements

This research was supported by Basic Science Research Program through the National Research Foundation (NRF) funded by the Ministry of Education, Science and Technology (2016H1C1A1035974).

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Correspondence to Gihyung Ryu.

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Ma, X., Ryu, G. Effects of green tea contents on the quality and antioxidant properties of textured vegetable protein by extrusion-cooking. Food Sci Biotechnol 28, 67–74 (2019). https://doi.org/10.1007/s10068-018-0437-7

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  • DOI: https://doi.org/10.1007/s10068-018-0437-7

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