Tanzania grants patent for orange peel wine preservative after tests cut browning 74%

Researchers at the University of Dar es Salaam have received patent approval in Tanzania for a wine-preservation technology made from orange peels, a laboratory-stage innovation that the university says reduced browning in treated wine by about 74% over 28 days.

The approval, announced by the University of Dar es Salaam on October 23, covers an invention described as a natural antibrowning agent from crude orange peel extract for wine production. According to the university, Tanzania’s Business Registrations and Licensing Agency, known as BRELA, informed the institution on September 15 that the registrar had decided to grant the patent. The application was filed in the name of the University of Dar es Salaam under number TZ/P/2026/000219.

The work was developed through a collaboration involving researchers from the Dar es Salaam University College of Education, which is part of the University of Dar es Salaam, and the Muhimbili University of Health and Allied Sciences through its Institute of Traditional Medicine. The inventors named in the patent application are Martine Kabezi, Lucas Paul Luchemba, James Zacharia Tano Zacharia and Michael Qwarse Xwatsal.

According to the university, the research focused on a long-standing problem in wine storage and marketing: browning caused by oxidation. As wine is stored, oxidative reactions can change its color and affect its visual appeal. Producers often rely on sulfites and other additives to manage those changes, and that has created interest in alternatives that could preserve color while using natural raw materials.

The Dar es Salaam team said orange peels, which are commonly discarded after consumption or food processing, contain antioxidant compounds including polyphenols, flavonoids and ascorbic acid. The researchers used those compounds to develop an extract intended to slow the reactions that lead to browning.

The university said the process begins with collecting orange peels, then drying and grinding them. The antioxidant compounds are extracted with an ethanol-water solvent system, after which the material is filtered, concentrated and dried before being prepared for use in wine production.

In laboratory testing, the university said, the extract performed better than ascorbic acid at the same concentration and came close to the effectiveness of sulfur dioxide, a widely used preservative in wine. Patent documents cited by the university indicate that a concentration of about 20 milligrams per liter provided significant browning inhibition while maintaining acceptable sensory quality under the tested conditions.

Lucas Luchemba said the researchers set out to examine whether local materials that are often treated as waste could be turned into useful products. In comments released by the university, he said the laboratory findings suggest orange peel extract could help address browning in wine. Martine Kabezi said the results were encouraging but also stressed that further development will be needed to determine how the technology can be used beyond the laboratory.

That caution is important because the patent approval does not mean the product is commercially ready. The university itself said the wider impact of the invention will depend on further development, production feasibility and the ability to translate the laboratory findings into practical applications. The announcement did not present industrial-scale trial data, shelf-life studies under commercial conditions, or details on manufacturing costs, regulatory steps or adoption by wineries.

Even so, the development could draw attention in the beverage sector because it points to two issues producers are watching closely: waste valorization and new preservation tools. If later testing supports the early findings, the extract could offer a way to turn a citrus byproduct into a functional ingredient for wine and possibly other fermented drinks where oxidation and color stability matter. For wineries and other beverage makers, the interest would not only be in whether the extract works, but also whether it can be produced consistently, at scale and at a cost that makes sense in real production.

The university framed the patent as an example of circular-economy thinking. Orange peels are usually thrown away, but the research suggests they may have value as a source of compounds that can be recovered and used. That could create a link between food-processing waste streams and beverage preservation, while also supporting efforts to reduce waste.

For Tanzania, the announcement carries an additional message about local research capacity and industrial application. The university said the invention shows how locally available materials can be used in scientific work aimed at practical problems. Nelson Boniface, the University of Dar es Salaam’s deputy vice chancellor for research, said the patent approval reflects the value of investing in research that responds to real-world challenges and the importance of protecting intellectual property so discoveries can move toward practical use.

The patent also gives the university a formal basis for technology transfer or commercialization discussions if the research progresses. Universities and research institutes often use patent protection to secure ownership before seeking partners to test, scale or license an invention. In this case, that next stage appears to remain ahead. The university said the approval is an important step in safeguarding the invention and recognizing the research behind it, but not proof that the product is ready for the market.

The announcement comes at a time when producers across food and beverage industries are looking more closely at natural additives, byproduct reuse and supply-chain efficiency. The Dar es Salaam team’s work fits into that broader trend, though its commercial relevance will depend on evidence that the extract can deliver reliable results outside controlled laboratory conditions.

For now, the main verified advance is the patent approval itself and the reported laboratory result showing reduced browning over 28 days. Whether orange peel extract becomes a viable tool for wineries or other beverage manufacturers will depend on future validation, production methods and industry uptake.