Highlights

• Gardenia fruit residues were transformed into a multifunctional extract containing both pectin polysaccharides and natural pigments. 

• The extract forms stable gels under controlled conditions. 

• Unlike purified pectin alone, the extract provides both texture and natural color simultaneously. 

• The material shows promising rheological properties for structured foods and 3D printing applications. 

• The study demonstrates a sustainable way to valorize plant-processing byproducts into high-value food ingredients. 

Summary

Gardenia fruit is traditionally valued for its natural pigments, particularly crocin, which provides bright yellow-orange coloration. However, large amounts of polysaccharide-rich residues remain after pigment extraction. Instead of discarding these residues, this study explores how they can be transformed into functional food materials. 

The researchers developed an extraction approach that preserves both pectin polysaccharides and natural pigments within a single composite extract. Pectin is a plant-derived polysaccharide commonly used as a gelling agent in foods such as jams and jellies. By retaining both structural polysaccharides and coloring compounds, the resulting Gardenia extract demonstrates dual functionality: it can form gels and provide natural color simultaneously. 

Comprehensive physicochemical characterization showed that the extract contains high-methoxyl pectin with desirable gelation properties. Rheological analysis indicated stable viscoelastic behavior under specific sugar and pH conditions, meaning the material behaves predictably during processing. Importantly, the extract exhibited sufficient structural integrity and printability for potential use in 3D food printing applications. 

This dual-function system differs from traditional purified pectin products, which require separate color additives. By integrating texture and color into a single natural extract, the approach simplifies formulation and enhances sustainability. It also provides a practical pathway for valorizing plant-processing residues, turning what would otherwise be waste into a multifunctional ingredient. 

The study highlights how structural characterization and functional testing can guide the development of innovative food materials from natural sources. Beyond Gardenia, this strategy may inspire similar valorization approaches for other plant-derived resources, supporting more sustainable and efficient food systems. 

Reference

L. Zheng, S. Gong, X. Wang, T. Zhou, M. Zhang, N. Li, and J.-L. Wu, “Preparation and characterization of pectin polysaccharides-containing Gardenia extract with dual functionality in food gel formation and coloring for 3D printing application,” International Journal of Biological Macromolecules, vol. 344, p. 150528, 2026, doi: 10.1016/j.ijbiomac.2026.150528.