Pectin is a natural gelling ingredient widely used in foods such as jams, desserts, and pharmaceutical products. Most commercial pectin comes from citrus peels and apple pomace, which limits supply diversity. Gardenia fruit, widely cultivated in Asia, generates large amounts of residue after industrial processing, but this material is often underused.
In this study, researchers extracted pectin from Gardenia residue using citric acid, a milder and more environmentally friendly alternative to common industrial acids. The extracted pectin had a very large molecular size (about 1,659 kDa) and a chemical profile that supports strong gel formation.
To test real-world usability, the team prepared gels and evaluated their texture and stability under different conditions. They found the pectin performed best in high-sugar, acidic settings typical of food processing. Importantly, they demonstrated practical use by applying the gel as an edible “ink” for 3D food printing, producing detailed, stable shapes.
These results suggest Gardenia residue could become a new sustainable source of pectin, supporting both waste reduction and future food manufacturing applications such as customized textures and personalized nutrition.
Reference
X. Wang et al., “Characterization and gelling properties of pectin extracted from Gardenia fruit,” Food Hydrocolloids, vol. 163, art. no. 111055, Jan. 2025, doi: 10.1016/j.foodhyd.2025.111055
