February 09, 2026 | Carbohydrate Polymers |
This study conducted by Southwest University, China investigated the potential use of rambutan seed starch as a novel material for 3D food printing applications. Conventional starches often have limited processing flexibility and inconsistent gelation behavior, which restricts their use in precision food printing. Since starch structure varies depending on botanical source, identifying alternative starch sources with suitable functional properties is important for developing high-performance food inks.
The researchers extracted and characterized starch from three rambutan seed varieties (BR-4, BR-5, and BR-7) and evaluated their structural, rheological, and printing properties. The starches exhibited small spherical granules, moderate amylose content, rapid gelation at room temperature, and high levels of slowly digestible starch. All starch gels met the IDDSI Level 5 standard for texture-modified foods.
Among the tested varieties, BR-7 showed the best performance. Its higher amylose content and abundant short-chain amylopectin enabled the formation of a dense gel network with rapid gelation, strong gel strength, high printing accuracy, and increased digestion resistance. The gelation time of BR-7 was substantially faster than that of pea starch.
The findings demonstrate that rambutan seed starch, an underutilized tropical fruit by-product, has strong potential as a functional ingredient for precision 3D food printing and texture-modified food development.
