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All Journal SPIN: Jurnal Kimia & Pendidikan Kimia CHEDS: Journal of Chemistry, Education, and Science Jurnal Masyarakat Indonesia Jurnal Mosfet
Resti Ayu Ningrum
Akademi Komunitas Industri Manufaktur Bantaeng
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Energy Materials Science & Nanotechnology

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Efektifitas Promosi Berbasis WhatsApp Dalam Pemasaran Minuman Honeymon Pratiwi Putri Lestari; Putri Rizky; Dedi Simanjuntak; Zainal; Sukmawati; Rika Silvany; Resti Ayu Ningrum
Jurnal Masyarakat Indonesia (Jumas) Vol. 5 No. 01 (2026): Jurnal Masyarakat Indonesia (Jumas)
Publisher : Cattleya Darmaya Fortuna

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54209/jumas.v5i01.361

Abstract

By utilizing existing social media, it is possible to promote and see consumer enthusiasm for the products being sold. In promoting the product, the business owner can create their own advertisements by making videos showing the process of producing Honeymon drinks, starting from the packaging process, sticker application, and the handover process from the Honeymon drink owner to cafes and sales stalls in several locations in Binjai City. They also provide articles about the health benefits of consuming Honeymoon drinks. Sales using social media can assess customer satisfaction through testimonials sent by consumers. Based on observations within a month of using social media, Honeymoon drink sales have increased, because the number of social media followers has also increased, making it easier to promote Honeymoon drinks.
Analisis Medan Magnet Di Luar Sumbu Solenoida Dengan Sensor Efek Hall SS49E 3 Dimensi Saparullah Saparullah; Hana Indah Pertiwi Arimi; Resti Ayu Ningrum
Jurnal Mosfet Vol. 5 No. 1 (2025): 2025
Publisher : Fakultas Teknik Universitas Muhammadiyah Parepare (FT-UMPAR)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31850/jmosfet.v5i1.3645

Abstract

This study analyzes the distribution of the magnetic field outside a solenoid using an experimental and theoretical approach with the Hall effect sensor SS49E, amplified by the IC LM358. Measurements were conducted in three dimensions to characterize the magnetic field along the solenoid. The experimental results indicate that the magnetic field distribution is non-uniform, with the highest intensity near the solenoid's ends and a minimum value at its center. Empirical data were compared with a theoretical model based on Biot-Savart’s law, showing a 98% correlation, which indicates the accuracy of the measurement method used. This research provides additional insights into the magnetic field outside solenoids and it can be an excellent school project for undergraduate students.
THE EFFECT OF ACIDIC AND ALKALINE CONDITIONS ON FREE FATTY ACID CONTENT DURING THE TRANSESTERIFICATION OF WASTE COOKING OIL Rismul Trianto Salawali; Resti Ayu Ningrum; Rika Silvany; Putri Rizky
SPIN JURNAL KIMIA & PENDIDIKAN KIMIA Vol. 8 No. 1 (2026): January - June 2026
Publisher : UIN Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20414/spin.v8i1.15425

Abstract

Waste cooking oil is a waste material with significant potential for utilization as a biodiesel feedstock; however, its high free fatty acid (FFA) content can reduce the efficiency of the transesterification process. This study aimed to investigate the effect of acidic and alkaline conditions on the presence of free fatty acids during the transesterification of waste cooking oil using sodium hydroxide (NaOH) and potassium hydroxide (KOH) catalysts. Prior to the transesterification process, the waste cooking oil was filtered and heated at 60°C for 30 minutes to reduce its moisture content. Transesterification was carried out using methanol at a methanol-to-oil molar ratio of 6:1 and a catalyst concentration of approximately 0.25% of the oil weight. The reaction pH was varied at 6, 7, 8, 9, and 10, while the reaction temperature was maintained at 60°C for 1 hour. FFA content was analyzed before and after transesterification using an acid-base titration method with 0.1 N NaOH solution. The results showed that the initial FFA content of the waste cooking oil was 5.20%. The use of the NaOH catalyst resulted in final FFA contents of 3.00%, 2.55%, 1.90%, 1.75%, and 2.20% at pH 6, 7, 8, 9, and 10, respectively, corresponding to FFA reductions of 42.3%, 51.0%, 63.5%, 66.3%, and 57.7%. Meanwhile, the KOH catalyst produced final FFA contents of 2.80%, 2.35%, 1.70%, 1.60%, and 2.05%, with FFA reductions of 46.2%, 54.8%, 67.3%, 69.2%, and 60.6%, respectively. The reduction in FFA content increased with increasing pH and reached its optimum condition at pH 9 for both catalysts. At pH 10, a decrease in FFA reduction efficiency was observed, which was likely attributed to the occurrence of side reactions such as saponification. Overall, the KOH catalyst demonstrated superior performance compared to NaOH in reducing FFA content under all tested pH conditions. These findings indicate that mildly alkaline to moderately alkaline conditions, particularly at pH 9, represent the optimum conditions for reducing FFA content during the transesterification of waste cooking oil.
ANALISIS PERBANDINGAN RENDEMEN MINYAK EUKALIPTUS (EUCALYPTUS OIL) DARI BAGIAN DAUN DAN PANGKAL DAUN MELALUI DESTILASI UAP AIR Rika Silvany; Putri Rizky; Resti Ayu Ningrum
CHEDS: Journal of Chemistry, Education, and Science Vol 9, No 2 (2025)
Publisher : Universitas Islam Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30743/cheds.v9i2.12253

Abstract

Penelitian ini bertujuan untuk menganalisis perbandingan karakteristik fisik minyak kayu putih yang diperoleh dari daun dan pangkal daun Eucalyptus sp. melalui metode distilasi uap. Parameter yang diamati meliputi rendemen, berat jenis, dan indeks bias. Bahan baku daun dan pangkal daun kayu putih masing-masing ditimbang sebanyak 3 kg dan didistilasi selama 2 jam menggunakan alat distilasi uap. Hasil penelitian menunjukkan bahwa jenis bahan baku berpengaruh nyata terhadap kualitas minyak yang dihasilkan. Rendemen minyak dari daun sebesar 0,64%, sedangkan dari pangkal daun sebesar 0,51%. Berat jenis minyak daun kayu putih sebesar 0,9286, dan berat jenis dari pangkal daun sebesar 0,9260, keduanya masih dalam rentang Standar Nasional Indonesia (SNI 06-3954-1995) yaitu 0,910–0,930. Indeks bias minyak dari daun adalah 1,4773, sedikit lebih tinggi daripada indeks bias dari pangkal daun, yaitu 1,4751, dan sedikit di atas rentang SNI 8834:2019 (1,4600–1,4750). Perbedaan ini menunjukkan bahwa daun eukaliptus mengandung konsentrasi senyawa teroksigenasi seperti 1,8-sineol yang lebih tinggi dibandingkan dengan pangkal daun. Secara keseluruhan, daun eukaliptus menghasilkan minyak dengan rendemen yang lebih tinggi dan sifat fisik yang lebih baik, sehingga menjadikannya bahan baku yang paling sesuai untuk produksi minyak eukaliptus.
Co-Authors Dedi Simanjuntak Hana Indah Pertiwi Arimi Pratiwi Putri Lestari Putri Rizky Putri Rizky Rika Silvany Rika Silvany Rismul Trianto Salawali Saparullah Saparullah Sukmawati Zainal