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Home Coffee News

Singaporean researchers concoct probiotic coffee and tea drinks

by Ethan Miller
January 12, 2021
in Coffee News
Reading Time: 3 mins read
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National University of Singapore (NUS) researchers have created new probiotic coffee and tea drinks that are packed with gut-friendly live probiotics.

Supervised by Associate Professor Liu Shao Quan from NUS Food Science and Technology, the two doctoral students who worked on these two new beverages assert that their drinks have a great taste and can be stored chilled or at room temperature for more than 14 weeks without compromising on their probiotic viability.

Traditional probiotic carriers like yoghurts and cultured milks are dairy-based products. NSU researchers say the rise in veganism, along with common health issues like lactose intolerance, high cholesterol, and allergies to dairy proteins, have stimulated the trend in non-dairy probiotic food and beverages.

“Coffee and tea are two of the most popular drinks around the world and are both plant-based infusions. As such, they act as a perfect vehicle for carrying and delivering probiotics to consumers,” explains Assoc Prof Liu.

“Most commercially available probiotic coffee and tea drinks are unfermented. Our team has created a new range of these beverages using the fermentation process as it produces healthy compounds that improve nutrient digestibility while retaining the health benefits associated with coffee and tea.”

Doctoral student Alcine Chan created a new probiotic coffee by adding specially selected nutrients to brewed coffee, followed by carefully chosen probiotics. The coffee mixture is left to ferment for a day and is placed in the refrigerator following probiotic fermentation. After this process, the chilled probiotic coffee is ready to drink. Sugar and milk can be added before consumption if desired.

“The formulation is tricky, especially relating to the type and amount of nutrients added, and the probiotic combination. Not every type of probiotics can grow in coffee brews. Adding too few nutrients will not enable probiotic growth while adding too many nutrients will give an unpleasant taste,” Alcine says.

She concocted several prototypes of the probiotic coffee, and the flavour varies between each one, but all retain the distinctive coffee taste.

“Some of the probiotic coffees give better-balanced acidity, some give better mouthfeels, some have deeper smoky flavours, and some can retain the coffee flavour better after long-term storage,” Alcine says.

The caffeine content is retained, so people who consume coffee for caffeine can still get their fix. The probiotic coffee also kept the chlorogenic acid content, which has been linked to a lot of the health benefits of coffee.

To create the probiotic tea, Wang Rui, another doctoral student from NUS Food Science and Technology, added nutrients into a tea infusion, followed by a careful selection of specific probiotics. The tea mixture is left to ferment for two days, after which it is ready to drink. Any kind of brewed tea can be used in this process, and throughout the fermentation process, the original flavour of the tea is largely retained, with fruity and floral notes introduced.

“The probiotic tea tastes like fruit tea with a little bit acidity, and a similar mouthfeel to the original tea. Drinkers can add sweeteners and milk, or cream, based on their preferences,” Rui says.

Each serving of probiotic tea and probiotic coffee contains at least one billion units of live probiotics. This the daily amount recommended by the International Scientific Association for Probiotics and Prebiotics.

Both doctoral students are refining their recipes to enhance the taste and flavour of the two beverages. The NUS team has also filed a patent for the probiotic coffee recipe and hopes to collaborate with industry partners to commercialise the drink.

Tags: additivesAsiaHealthprobioticsresearchscienceSingapore

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