Physicochemical Analysis, Caffeine Quantification, and Sensory Profiling of Oenanthe javanica Tea

  • Emi Norzehan Mohamad Mahbob Faculty of Applied Sciences, Universiti Teknologi MARA, Perak Branch
  • Nurul Afiqah Ahmad Shahril Faculty of Applied Sciences, Universiti Teknologi MARA, Perak Branch
  • Nabila Amani Ahmad Naseri Faculty of Applied Sciences, Universiti Teknologi MARA, Perak Branch
  • Nur Izzah Nazlah Aznan Faculty of Applied Sciences, Universiti Teknologi MARA, Perak Branch
  • Nurliyana Atiqah Hamidi Faculty of Applied Sciences, Universiti Teknologi MARA, Perak Branch
  • Nurul Izzati Hamirrudin Faculty of Applied Sciences, Universiti Teknologi MARA, Perak Branch
  • Izzati Najihah Ahmad Razy Faculty of Applied Sciences, Universiti Teknologi MARA, Perak Branch
Keywords: Oenanthe javanica, herbal infusion, ATR-FTIR, caffeine, physicochemical analysis, sensory evaluation

Abstract

Herbal tea infusions have gained increasing attention due to their potential health-promoting and therapeutic properties. Oenanthe javanica has been recognised for its antioxidant and detoxifying attributes; however, its sensory and physicochemical characteristics remain insufficiently explored. This study aimed to determine caffeine concentrations across different formulations, evaluate key physicochemical properties, and assess consumer sensory acceptance. Leaf samples were analysed through moisture content determination, controlled brewing conditions (water volume, temperature, and storage), Fourier transform infrared spectroscopy (FTIR), spectrophotometric caffeine quantification, and sensory evaluation involving 30 panellists. Physicochemical analysis showed that dried O. javanica leaves exhibited slightly higher moisture content than Camellia sinensis (black tea). FTIR analysis confirmed the presence of key functional groups, including C–H, C=O, C=C, and C–N bonds, which contribute to its chemical profile. Caffeine quantification confirmed its presence in O. javanica, while black tea consistently exhibited the highest caffeine content, and the 1:1 blended formulation showed the lowest concentration due to dilution effects. The calibration model based on the Beer–Lambert law demonstrated strong linearity for caffeine quantification. In addition, brewing conditions and storage significantly influenced the physicochemical properties of the infusions, where lower solvent volumes produced more concentrated, acidic, and caffeine-rich extracts. Sensory evaluation revealed that pure O. javanica tea received lower overall hedonic acceptance compared with black tea, while the blended formulation showed improved acceptability. Overall, the findings provide new insights into the physicochemical and sensory characteristics of O. javanica, supporting its potential application as a functional ingredient in herbal tea product development.

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References

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Published
2026-08-29
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