Tea polyphenols are pale yellow to brownish-yellow aqueous solutions, powdered solids, or crystals with a slight tea aroma. They have an astringent taste and are readily soluble in water, ethanol, and ethyl acetate, and slightly soluble in oils. They exhibit good heat and acid resistance, remaining highly stable within a pH range of 2–7. They are slightly hygroscopic, with aqueous solutions having a pH of 3–4. They readily oxidize and turn brown under alkaline conditions. Catechins account for approximately 60%–80% of the total tea polyphenols. In polyphenol extraction from green tea and its byproducts, the tea polyphenol content is greater than 95%, including 70%–80% catechins; 4%–10% flavonoids; 0.3%–0.5% gallic acid; 0.2%–0.5% amino acids; and 0.5%–1.0% total sugars. Chlorophyll is mainly composed of pheophytin, with a content of 0.01%–0.05%.

Natural Field Co., Ltd. is a technology-driven enterprise dedicated to the research, production, and sales of health-care raw materials, cosmetic ingredients, and plant extracts. Our product warehouse and quality control center are located in Caotang Industrial Park, Xi’an High-tech Zone, China. The company has obtained multiple certifications, including Kosher, ISO9001, HACCP, SC production license, and food export enterprise registration. Following a resource-sharing and win-win business model, Natural Field has established a 2,000-square-meter R&D center in Shanghai and collaborates with experienced doctors and professors from both domestic and international institutions to strengthen its technical capabilities. To better support our customers, we have also introduced a dedicated product operation service model, where each project is guided by a professional team including QA, QC, product engineers, and technical experts to ensure reliable quality and comprehensive service.