Process Optimisation and Quality Evaluation of a Vitamin D₃-Fortified, Monk Fruit– Sweetened Fermented Milk Beverage Containing Shatavari and Ashwagandha
This study successfully optimized and developed a sensorially acceptable, vitamin D₃-fortified fermented milk beverage sweetened with monk fruit and enriched with Shatavari and Ashwagandha, demonstrating that complete sucrose replacement yields a product with superior antioxidant activity, viscosity, and antibacterial properties compared to non-herbal controls.
Original paper licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). This is an AI-generated explanation of the paper below. It is not written by the authors. For technical accuracy, refer to the original paper. Read full disclaimer
Imagine a glass of yogurt-based drink, a traditional Indian beverage known as lassi, but transformed into a modern health tool. This drink is not just about taste; it is a vehicle for delivering essential nutrients and plant-based medicines that our bodies need but often lack. In many parts of the world, people struggle to get enough vitamin D, a nutrient crucial for bone health and immune function, because very few foods naturally contain it. At the same time, there is a growing desire to reduce sugar in our diets while still enjoying sweet, comforting foods. Scientists are working to solve these problems by mixing specific medicinal plants, known as Shatavari and Ashwagandha, into fermented milk. These plants have been used for centuries in traditional medicine to support the body, but adding them to a drink is tricky. They can make the liquid bitter, change its color, or make it feel gritty in the mouth. The challenge is to find the perfect balance where the drink remains smooth and tasty, delivers the medicine effectively, and replaces regular sugar with a natural, low-calorie alternative without losing its appeal.
A team of researchers at Kamdhenu University in India set out to solve this exact puzzle. They wanted to create a fermented milk beverage that was fortified with vitamin D, sweetened with a monk fruit-based sweetener instead of sugar, and enriched with powders from Shatavari and Ashwagandha roots. The goal was to see if they could make a product that people would actually want to drink while getting significant health benefits. The process began by testing different amounts of the two plant powders and sugar to find the "sweet spot" where the drink looked good, felt smooth, and tasted balanced. They used a methodical approach to test every combination, from very low amounts of ingredients to very high amounts, asking a group of trained tasters to rate the drinks on everything from color to overall enjoyment.
The researchers discovered that the perfect recipe was not about using the maximum amount of ingredients, but rather finding a precise middle ground. They found that adding 0.35 percent Shatavari and 0.35 percent Ashwagandha, along with 12.5 percent sugar, created the most enjoyable drink. At this level, the bitterness of the herbs was masked just enough by the sweetness, and the texture remained smooth rather than grainy. Once this ideal formula was established, the team replaced the sugar entirely with a commercial monk fruit sweetener, which is designed to taste like sugar but without the calories. They tested different concentrations of this sweetener to see how it affected the drink. The results showed that using 12.5 percent of the monk fruit sweetener produced a beverage that was even more popular with tasters than the sugar version, scoring an impressive 8.94 out of 9 on a scale of enjoyment.
Beyond taste, the scientists measured what was actually happening inside the drink. They found that the herbal version was thicker and more viscous than a plain fermented milk drink, likely because the plant powders added structure to the liquid. The drink was also packed with antioxidants, a measure of its ability to fight harmful molecules in the body. The herbal version showed more than double the antioxidant activity of the plain control drink. Furthermore, the researchers tested the drink's ability to stop the growth of harmful bacteria in a laboratory setting. The herbal drink was significantly better at inhibiting bacteria like Staphylococcus aureus and Salmonella than the plain version, suggesting that the combination of herbs and fermentation created a powerful protective effect.
Crucially, the team confirmed that the drink successfully delivered the vitamin D they had added. They measured the final product and found that a 100-milliliter serving contained nearly 12 micrograms of vitamin D, which is about 80 percent of the daily recommended amount for an adult. This means a single small cup could provide a substantial portion of the vitamin a person needs. The fermentation process, which turns milk into yogurt, took slightly longer when the herbs were added, but the beneficial bacteria responsible for the fermentation still thrived, reaching high numbers in both the sugar-sweetened and monk fruit-sweetened versions. The study concludes that it is entirely possible to create a delicious, vitamin-fortified drink that uses natural sweeteners and medicinal herbs, offering a viable path toward a healthier dairy product that people can enjoy every day.
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