Propolis is often viewed merely as a secondary by-product of stingless bee apiculture, yet its biochemical complexity positions it as a prime candidate for agrifood waste valorization. A new original research article published in Terra Alimentaria 2026, Vol. 1 (1) investigates the food chemistry and functional health properties of methanolic propolis extracts from four Indonesian Trigona stingless bee species. The study provides a robust biochemical foundation for upcycling these resinous matrices into high-value functional food ingredients.
The Entomological Impact on Food Chemistry
The biochemical composition of propolis is highly heterogeneous, heavily influenced by its botanical origins and the unique digestive and metabolic interactions of the specific bee species producing it. To understand these variations, researchers sourced raw propolis from four distinct species (Trigona clypearis, T. drescheri, T. sarawakensis, and T. terminata) cultivated in Yogyakarta, Indonesia.
Using Ultra High-Performance Liquid Chromatography-High Resolution Mass Spectrometry (UHPLC-HRMS), the research team mapped the complex phytochemical profiles of the methanolic extracts. The analysis confirmed that the entomological origin fundamentally dictates the metabolic profile:
- Distinct Signatures: Chemometric analysis, including Principal Component Analysis (PCA), demonstrated that T. clypearis and T. terminata possess highly divergent and distinct phytochemical compositions, occupying isolated spatial coordinates in the dataset.
- Primary Markers: Variable Importance in Projection (VIP) identified four dominant metabolites driving the differences across the species: 2,6-dimethyl-γ-pyrone, 5-OxoETE, 1,3,7-trihydroxy-6-methoxy-4,5-diisoprenylxanthone, and ethyl oleate.
- T. clypearis was notably enriched in specific functional metabolites, particularly ethyl oleate, betaine, and glycitein.
In Vitro Bioactivity: Targeting Colorectal Carcinoma
To evaluate the functional efficacy of these extracts, the researchers conducted an MTT cytotoxicity assay against the WiDr colorectal carcinoma cell line. The results revealed a direct correlation between phytochemical diversity and functional health properties:
- T. clypearis: Exhibited the highest bioactivity, demonstrating a strong capacity to suppress cancer cell viability with an IC50 value of 230.8 μg/mL. This pronounced cytotoxicity is directly attributable to its rich biochemical profile, particularly the synergistic presence of betaine (a critical osmotic regulator and tumor suppressor) and glycitein (a potent isoflavone known to block angiogenic pathways).
- T. drescheri and T. terminata: Both demonstrated significant bioactive suppression of cellular viability, yielding IC50 values of 290.7 μg/mL and 388.8 μg/mL, respectively.
- T. sarawakensis: Exhibited an IC50 > 1,000 μg/mL, indicating a lack of meaningful functional activity. This diminished biological efficacy strictly correlated with its narrower chemical matrix, which contained only four dominant high-concentration metabolites compared to the seven found in the highly bioactive species.
Implications for Agrifood Valorization
The successful recovery and extraction of propolis from Trigona nests illustrate a highly viable pathway for agrifood waste valorization. The study proves that the metabolic processing by specific stingless bees determines both the phytochemical yield and the subsequent functional quality of the propolis.
While raw propolis contains high levels of inactive components like beeswax and plant tissue, the purified methanolic extracts of T. clypearis, T. drescheri, and T. terminata yield a pure matrix of bioactive resin with measurable in vitro cytotoxicity. These findings validate the targeted upcycling of specific Trigona by-products, providing a strong biochemical basis for their future integration as high-value, bioactive ingredients in sustainable functional foods.
View more of this here: Arrijal, N. Z., Hermawansyah, A., Febriansyah, R., Alam, L. P. M., Dewanti, F. M. F., Hayati, S. N., & Rizal, W. A. (2026). Metabolite Profiling and Bioactive Characterization of Stingless Bee Propolis Extracts: Implications for Functional Food Valorization. Terra Alimentaria, 1(1), e2026003. https://journals.nusaxis.com/terra/article/view/260001
