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All Journal ALCHEMY Jurnal Penelitian Kimia Jurnal Pendidikan Kimia FKIP Universitas Halu Oleo
Nurina Rizka Ramadhania
Universitas Negeri Surabaya
Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Environmental Science Materials Science & Nanotechnology

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Chemical Composition and Aromatherapy-Based Relaxation Potential of Selected Indonesian Herbal Essential Oils Nurina Rizka Ramadhania
ALCHEMY Jurnal Penelitian Kimia Vol 22, No 1 (2026): March
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.22.1.114348.60-73

Abstract

Aromatherapy, an alternative treatment approach, is gaining popularity in Indonesia due to its ability to provide psychological and physiological relaxation. The use of Indonesian herbal plants, especially Syzygium polyanthum (bay leaf), Camellia sinensis (green tea), Cymbopogon citratus (lemongrass), Lavandula angustifolia (lavender), and Citrus limon (lemon) in aromatherapy has long been recognized for its distinctive, refreshing aroma and diverse secondary metabolites. This scientific literature review is presented to reveal the relationships between the presence and diversity of chemical composition of selected Indonesian herbal plants and various influencing factors, such as plant origin and the extraction method used. The aroma-defining properties of eugenol, geraniol, linalool, citral, and limonene in essential oils, when combined, can synergistically trigger bioactivities, including antioxidant, antibacterial, anti-inflammatory, and relaxing effects. Scientifically, the relaxing effects of aromatherapy are produced through stimulation of the olfactory system, which connects to the limbic system in the brain, including the amygdala and hypothalamus, which are responsible for improving mood and enhancing emotional regulation. Based on this review, the metabolite profile of essential oils plays a role in determining their potential bioactivity, especially in selected herbal plants as sources of natural relaxation therapy.
Development of Guided Inquiry-Oriented Student Activity Sheets to Train Metacognitive Skills on the Material of Reaction Rate Meni Feronika Tainmeta; Harun Nasrudin; Nurina Rizka Ramadhania
Jurnal Pendidikan Kimia FKIP Universitas Halu Oleo Vol. 10 No. 3 (2025): December 2025
Publisher : Jurusan Pendidikan Kimia Universitas Halu Oleo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36709/jpkim.v10i3.204

Abstract

This study developed a guided inquiry-oriented student activity sheet to train metacognitive skills on reaction rate material. The background shows low metacognitive skills and students' difficulties in understanding the material. The method used was the Borg and Gall R&D model up to the product trial stage, with 30 students of grades XI-8 of Gedangan High School as subjects. The results showed that the developed student activity sheet was valid, practical, and effective. Content and construct validity were classified as very valid and valid, practicality was seen from student responses reaching 90.9%, and relevant activities were more than 91%. Effectiveness was seen from the increase in the N-Gain score (0.55–0.90) and the results of the paired sample t-test were significant (Sig. 0.000). The metacognitive inventory questionnaire also showed very good results. Thus, this activity sheet is suitable for training metacognitive skills in learning reaction rates.
Co-Authors Harun Nasrudin Meni Feronika Tainmeta