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Ratih C F Ratumanan
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Proses Ekstraksi Antioksidan dari Daun Kalanchoe pinnata: Studi Pengaruh Ukuran Partikel dan Kinetika Maserasi Sabrianah Badaruddin; Alif Nur Laili Rachmah; Ratih C F Ratumanan; Hukubun, Ronald Darlly; Tamaratritania Citta Trisnantari
INSOLOGI: Jurnal Sains dan Teknologi Vol. 4 No. 4 (2025): Agustus 2025
Publisher : Yayasan Literasi Sains Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55123/insologi.v4i4.6183

Abstract

Kalanchoe pinnata leaves are rich in bioactive compounds, including flavonoids and phenolic constituents, which exhibit notable antioxidant properties. However, the efficiency of extraction processes is highly influenced by operational variables such as the type of physical pre-treatment and maceration duration. This study aims to evaluate the effect of three physical pre-treatment methods (manual grinding, chopping, and blending) and maceration periods ranging from 3 to 5 days on the antioxidant activity of K. pinnata leaf extracts using the DPPH radical scavenging assay. Results indicate that the grinding method combined with five days of maceration yields the highest antioxidant activity (95.04%), while blending leads to the lowest activity (81.78%), presumably due to heat-induced degradation of active compounds. Kinetic observations show that antioxidant activity tends to plateau on day five, particularly in ground samples. These findings highlight the critical influence of particle size reduction and solvent–solid contact time on mass transfer efficiency during extraction. This preliminary investigation provides a scientific basis for further research on the optimization of natural antioxidant extraction processes and the development of functional herbal formulations derived from K. pinnata leaves.
Geologi Daerah Lebaksiuh dan Sekitarnya, Kecamatan Jatigede, Kabupaten Sumedang, Propinsi Jawa Barat Ratih C F Ratumanan; Diana Porsisa; Sri Indriaty; Rimawanto Gultom; Ronald D Hukubun
INSOLOGI: Jurnal Sains dan Teknologi Vol. 4 No. 5 (2025): Oktober 2025
Publisher : Yayasan Literasi Sains Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55123/insologi.v4i5.6457

Abstract

Administratively, the research area is located within the Lebaksiuh Region and its surroundings, Jatigede District, Sumedang Regency, West Java Province. The method used in this study is geological mapping. The research area is divided into five geomorphological units: the Steep Intrusive Geomorphology Unit, the steep structural hill unit, Gently to moderately steep structural hills, the moderately structural hill unit, and denudational unit. Based on the stratigraphy units, the research area is subdivided into three rock units: the carbonate sandstone unit (Tobpk), the tuffaceous sandstone unit (Tpbp), and the intrusive unit (a). The geological structures developed in the study area include folds, joints, and faults. The geological history of the area shows that during the late oligocene–early miocene, the carbonate sandstone unit (Tobpk) was deposited in a bathyal depositional environment. Subsequently, unconformably, the sandstone unit (Tpbp) was deposited during the pliocene in a fluvial environment. The depositional process was later interrupted by tectonic activity during the pleistocene, characterized by compressional tectonics that formed a series of geology structure trending northwest–southeast. Tectonic activity also led to the formation of joints and faults in the study area, as well as volcanic activity that produced intrusions along zones of weakness. The geological resources and hazards identified in the research area include potential mineral resources and geotourism potential, particularly at the Cisempong Waterfall.
Co-Authors Alif Nur Laili Rachmah Badaruddin, Sabrianah Diana Porsisa Rimawanto Gultom Ronald Darlly Hukubun Sri Indriaty Trisnantari, Tamaratritania Citta