Article Per Year (5 Year)
p-Index From 2021 - 2026
1.203
P-Index
This Author published in this journals
All Journal VALENSI Cerdika: Jurnal Ilmiah Indonesia Bulletin of Chemical Reaction Engineering & Catalysis Jurnal Sains Materi Indonesia
Siti Nurbayti
Program Studi Kimia Fakultas Sains dan Teknologi Universitas Islam Negeri Syarif Hidayatullah Jakarta
Humanities Chemical Engineering, Chemistry & Bioengineering Chemistry Economics, Econometrics & Finance Education Engineering Health Professions Industrial & Manufacturing Engineering Materials Science & Nanotechnology Public Health Social Sciences

Published : 6 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 2 Documents
Search
Journal : valensi

 1 
Comparison of Maceration and Soxhletation Methods on the Antioxidant Activity of the Bouea macrophylla Griff Plant Rudiana, Tarso; Nurbayti, Siti; Ashari, Tiara Hadi; Zhorif, Sherina Arestia; Suryani, Nani
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 9, No. 2, November 2023
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v9i2.35239

Abstract

The impact of extraction methods on the potency of plant extracts is crucial. Bouea macrophylla Griff., a tropical fruit plant rich in phenolic and flavonoid compounds, exhibits strong antioxidant activity. This study aimed to evaluate the effect of maceration and soxhletation extraction techniques on B. macrophylla plants on antioxidant activity in vitro using the method of inhibiting DPPH radical compounds. Ethyl acetate and ethanol solvents were utilized to macerate and soxhlet all parts of the plant. Subsequently, each extract was subjected to quantitative analysis for antioxidant activity, total phenolic, and flavonoid content through UV-Vis spectrophotometry. Quantitative analysis revealed substantial antioxidant activity and notable levels of total phenolic and flavonoid content across all plant parts. The result indicated that although both maceration and soxhletation showed a significant impact on yield (p=0.009) and total flavonoids (p=0.038), significant differences in antioxidant activity (p=0.409) or total phenolics (p=0.874) within the plant extracts of B. macrophylla were not observed at a significance level of 5%.
Natural Zeolite as Mo and MoP Catalysts Support for Catalytic Deoxygenation of Jatropha Oil Aziz, Isalmi; Farhan, Muhammad; Saridewi, Nanda; Azizah, Yulyani Nur; Muawanah, Anna; Nurbayti, Siti; Dwiatmoko, Adid Adep; Adhani, Lisa
Jurnal Kimia Valensi Jurnal Kimia VALENSI, Volume 11, No. 1, May 2025
Publisher : Department of Chemistry, Faculty of Science and Technology Syarif Hidayatullah Jakarta State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v11i1.45272

Abstract

Non-edible oil, such as Jatropha oil, is an interesting feedstock for the development of renewable diesel (green diesel). Catalytic deoxygenation using natural zeolite-supported Mo-based catalysts is a promising process for the conversion of Jatropha oil to green diesel. Mo and MoP catalysts supported on natural zeolite were synthesized by wet impregnation at a concentration of 5% (w/w). The catalysts were characterized by XRD, XRF, SAA and NH3-TPD. The catalysts were successfully synthesized with the appearance of Mo and MoP peaks on the catalyst diffractogram. XRF results also showed that Mo and P were present in the catalyst. Metal impregnation decreased the surface area and pore volume of the catalyst, but increased the average pore diameter. The NH3-TPD profile of the catalyst showed that the weak acid sites of both catalysts were larger than the strong acid sites. Based on the activity test of catalytic deoxygenation of Jatropha oil, the MoP/HZ catalyst produced a higher conversion (67%) and liquid product yield (79%) than Mo/HZ. This is associated with a larger pore diameter, so that the distribution of reactants on the catalyst surface is more optimal. However, the highest green diesel selectivity of 82% is produced by the Mo/HZ catalyst. The Mo/HZ catalyst is more oriented towards the HDO reaction, whereas the MoP/HZ catalyst is more oriented towards the DCO/DCO2 reaction.
Co-Authors adawiah adawiah, adawiah Agustino Zulys Amelia, Fanny Amellia Amellia Anna Muawanah Ashari, Tiara Hadi Bale, Uly Fitria Dede Sukandar Dwiatmoko, Adid Adep Fadhilla, Rizka Isalmi Aziz Lisa Adhani Mala, Farhah Syahidatul Misri Gozan Muhammad Farhan Muryanto Nanda Saridewi, Nanda Nani Suryani Ramadhan, Fitri Nur Tamamala, Ananda Farhan Tarso Rudiana, Tarso Taryono, Taryono Tulhusna, Latifah Yanni Sudiyani Yasir, Hilmi Naufal Yulyani Nur Azizah Zhorif, Sherina Arestia