For food preservatives
Although chemical preservatives are effective at preventing spoilage, they can negatively impact human health. Enzymes and microorganisms are the primary contributors to food decay and deterioration. Plant polyphenols are made up of multiple phenolic hydroxyl groups, which can bind to protein sites and metal ions, leading to the destruction of cell substructures and strong antibacterial effects. Natural preservatives like blueberry polyphenols, obtained through chemical analysis and separation techniques, are ideal for food processing and maintenance due to their inherent antibacterial qualities.
For food colorants
The use of synthetic pigments has been progressively restricted due to their varying levels of toxicity. Many countries have even banned the addition of synthetic pigments to food altogether. In contrast, using blueberry leaf juice to dye black rice has been a tradition since the Tang Dynasty, and continues in many regions today. Blueberry leaves contain an abundance of anthocyanin polyphenols, which have been shown to have medicinal and edible value, as well as health benefits. Anthocyanins are also a natural food colorant, providing yet another reason to use blueberry leaf juice as a dye.
For nutraceutical foods
Extensive and in-depth research conducted in recent years has established plant polyphenols as the seventh vital nutrient. Among the various sources of plant polyphenols, blueberry extract stands out due to its high content. Scientific studies have shown that polyphenols present in blueberry leaves possess remarkable antioxidant properties, aid in lowering blood sugar levels, promote better vision, and boost immunity. These proven efficacies, along with other influencing factors, contribute to blueberry leaf polyphenols' significant nutritional and health value. Leveraging modern preparation techniques, the composite natural active ingredient extracted from blueberry leaves can be processed into granules. To cater to diverse consumer preferences, different flavoring agents can be incorporated. When consumed, these granules can be conveniently brewed into a flavorful solution.
