Study of carbohydrate, bioactive compounds, antioxidants, vitamin C, and mineral content at the ripening stage of grapes, rambutan, and pineapple.
Level 5 - mechanism / opinion, no new human data
Level 5 by design analogy; in vitro laboratory food composition analysis with no human subjects.
PubMed 40418555 · doi:10.14715/cmb/2025.71.5.4
What was done
Researchers measured carbohydrate fractions (glucose, fructose, sucrose), total soluble solids (TSS), carotenoids, flavonoids, total phenolics, total antioxidant capacity, pH, and macro- and micro-minerals in grapes, rambutan, and pineapple across ripening stages. The first experiment analyzed 50 rambutan fruits, 5 pineapple fruits, and 5 grape bunches. A second experiment evaluated biochemical shifts across the ripening process.
What was found
The abstract reports no absolute quantitative values, providing only relative comparisons. In Experiment 1, rambutan had the highest sucrose, fructose, TSS, flavonoids, calcium, manganese, iron, and zinc. Pineapple had the highest vitamin C, fiber, and phosphorus. Total phenolics and antioxidants were higher in pineapple and rambutan than in grapes. Potassium was higher in grapes and pineapple than in rambutan. In Experiment 2 across ripening, glucose, sucrose, vitamin C, and moisture decreased, while fructose, TSS, pH, biomass, and total antioxidant capacity increased.
Why it matters
Understanding the biochemical profile and ripening dynamics of different fruits helps map their specific nutritional strengths, such as identifying rambutan as a richer source of flavonoids and pineapple as a primary source of vitamin C and phenolics.
Limits
This is a bench-level laboratory study with no human physiological or clinical outcome data. The abstract completely omits numerical measurements, variance, and statistical significance testing. The physical sample size was small (5 pineapple fruits and 5 grape bunches), and cultivar, soil, and geographical variables were not described in the abstract.
Cited by
- partial As fruit ripens and becomes overripe, its sugar content increases while its vitamin C content decreases.