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All Journal VALENSI The Journal of Pure and Applied Chemistry Research Eksakta : Berkala Ilmiah Bidang MIPA Optika : Jurnal Pendidikan Fisika Jurnal Sains dan Edukasi Sains Eduproxima : Jurnal Ilmiah Pendidikan IPA Inornatus: Biology Education Journal Jurnal Esabi (Jurnal Edukasi dan Sains Biologi)
Damiana Nofita Birhi
Unknown Affiliation
Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Education Energy Engineering Environmental Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Physics Other

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One-Pot Catalytic Oxidation for Transforming Eugenol to Vanillin Using ZnAl2O4 Catalyst Damiana Nofita Birhi; Elvina Dhiaul Iftitah; Warsito Warsito; Adzkia Qisthi Ismail
The Journal of Pure and Applied Chemistry Research Vol 10, No 3 (2021): Edition September-December 2021
Publisher : Chemistry Department, The University of Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jpacr.2021.010.03.622

Abstract

In this study, ZnAl2O4 catalyst was synthesized with the capability of transforming eugenol to vanillin through One-Pot Catalytic Oxidation. ZnAl2O4 was synthesized from Zn(CH3COO)2.2H2O and Al2O3 using the wet-impregnation method, and characterized by FTIR, XRD, and SEM. One-Pot Catalytic Oxidation was conducted by heating under reflux at 150oC using nitrobenzene and a certain amount of ZnAl2O4 catalyst (4% and 7%) for 2 and 3 hours of reaction. Catalytic Oxidation is also carried out without catalyst as a comparison. The vanillin product was confirmed by GC and spectral data achieved from UV-Vis, FTIR, and mass spectrometry. The results revealed that transforming eugenol to vanillin using ZnAl2O4 catalyst provides a better selectivity value than without using the catalyst, is 100% for the use of 4% catalyst in 2 hours, while without catalyst gives 88% in 3 hours. In addition, the use of 4% catalyst in 3 hours gives 94% for selectivity of vanillin, and the use of 7% catalyst gives selectivity values at 82% and 85%, respectively for 2 hours and 3 hours. The conversion rate of the use of catalyst and without catalyst gives the perfect rate at 100%, but the use of catalyst produces better vanillin with percent yield at 2.485 for 2 hours, and 3.22% for 3 hours, while without catalyst have percent yield of vanillin at 1.94% for 3 hours.
PENGARUH MODEL PEMBELAJARAN DISCOVERY LEARNING BERBASIS PRAKTIKUM TERHADAP HASIL BELAJAR SISWA PADA KONSEP SIFAT KOLIGATIF LARUTAN Antonia Fransiska Laka; Damiana Nofita Birhi
EDUPROXIMA : Jurnal Ilmiah Pendidikan IPA Vol 6, No 3 (2024)
Publisher : Universitas Bhinneka PGRI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29100/.v6i3.5349

Abstract

Tujuan dari penelitian ini adalah untuk mengetahui pengaruh model discovery learning berbasis praktikum terhadap hasil belajar peserta didik pada konsep sifat koligatif larutan. Penelitian ini dilakukan di SMAK Frateran Ndao dengan menggunakan metode penelitian quasi eksperimen dengan desain penelitian pretest-posttest control group design. Sampel yang digunakan sebanyak 28 peserta didik kelas eksperimen dan 26 peserta didik kelas kontrol. Teknik pengumpulan data diperoleh melalui instrumen tes hasil belajar sebanyak 30 butir soal yang kemudian dianalisis menggunakan uji-t. Hasil penelitian menunjukkan bahwa uji hipotesis menggunakan uji-t dengan SPSS mendapatkan nilai Sig. (2-tailed) adalah 0,00. Nilai sig (2-tailed) yang lebih rendah dari 0,05 dapat diartikan bahwa hipotesis diterima, dimana terdapat pengaruh yang signifikan antara metode discovery learning berbasis praktikum dengan hasil belajar peserta didik pada materi Sifat Koligatif Larutan. 
Use of CoO/ZnAl2O4 Catalysts and Microwaved Assisted in Vanillin Synthesis Birhi, Damiana Nofita; Iftitah, Elvina Dhiaul; Warsito, Warsito
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 9, No. 1, May 2023
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v9i1.29727

Abstract

Vanillin is a main component in vanilla, which is widely used in the industrial world. Market demand for vanillin extract continues to increase, while the availability of vanilla pods is decreasing. To overcome this problem, research on the synthesis of vanillin continues to be carried out and develops every year. This research aims to examine the conversion level and selectivity of the catalyst as well as microwave radiation efficiency usage in vanillin synthesis. Catalyst CoO/ZnAl2O4 was synthesized from CoO and ZnAl2O4 using the impregnation method, then analyzed using FTIR, XRD, and SEM-EDX. Vanillin synthesis was conducted in two steps, incorporating microwave usage at 120oC, underwent 30 minutes to be completed then followed by oxidation around 10- and 15-minutes involving nitrobenzene also 1%, 4%, and 7% of catalysts CoO/ZnAl2O4. The result showed that during 10 and 15 minutes, the selectivity value and various yield percentages for each time variation and catalyst loading of vanillin had been successfully 100% converted. The best result was obtained using CoO/ZnAl2O4 with 4% catalyst loading for 15 minutes. The selectivity value and yield percentages were 67.78% and 7.5%. A one-step vanillin synthesis with conventional reflux could also be a comparison. The reactions were done at 130oC for 2 and 3 hours with 4% catalyst loading.
Study of Indonesian Rhododendron: Classification, Conservation, and Pharmacology Activity Birhi, Damiana Nofita; Meike Tiya Kusuma; Antonia Fransiska Laka
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 26 No. 02 (2025): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464)
Publisher : Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/eksakta/vol26-iss02/583

Abstract

Rhododendrons are representatives of ornamental plants with a wide range of pharmacological activities. Indonesia is the second richest country in Rhododendron plants with 233 species. Unfortunately, more than 85 species are severely lacking in data, 21 species are vulnerable, and more than 30 others are endangered or even no longer found. The purpose of this study is to review the species that have been found in Indonesia, and find the factors that affect conservation efforts to prevent the extinction of this plant. The results of the study succeeded in recording 221 species that had been found in Indonesia with 4 of them not having sufficient data so that named Rhododendron sp1, R. sp2, R. sp3 and R. sp4 by local residents. Four species were confirmed to be extinct, and most of the ex-situ conservation efforts unsuccessful. The results of this study show that there is need for cooperation between the government and residents around the Rhododendron growing location in an effort to preserve this plant. Researchers are also expected to pay more attention to this plant considering it has bioactive compounds with very high pharmacological properties.
Pola penyebaran spasial tumbuhan endemik Begonia kelimutuensis di Taman Nasional Kelimutu Nusa Tenggara Timur Wao, Yosephina Payu; Birhi, Damiana Nofita
Jurnal Esabi (Jurnal Edukasi dan Sains Biologi) Vol. 6 No. 1 (2024)
Publisher : Universitas Bung Hatta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37301/esabi.v6i1.75

Abstract

Begonia kelimutuensis merupakan tumbuhan berbunga endemik yang hanya ditemukan di Pulau Flores, khususnya di Taman Nasional Kelimutu, Kabupaten Ende, Nusa Tenggara Timur. Keunikan tanaman ini terletak pada warna bunganya yang putih mencolok serta bentuk mahkota yang menarik, sehingga berpotensi menjadi daya tarik wisata alam. Namun, studi mengenai ekologi dan pola penyebarannya masih sangat terbatas. Penelitian ini bertujuan untuk menganalisis pola sebaran spasial populasi B. kelimutuensis di kawasan Arboretum Taman Nasional Kelimutu, yang termasuk dalam zona pemanfaatan. Metode yang digunakan adalah purposive sampling dengan membuat satu jalur transek sepanjang 340 meter, terdiri dari sembilan plot berukuran 20 × 20 meter, dengan jarak antarplot 20 meter. Setiap individu yang ditemukan dicatat posisi koordinatnya menggunakan GPS. Analisis pola sebaran dilakukan dengan Indeks Dispersion Morisita (Ip), dan peta distribusi dibuat menggunakan perangkat lunak ArcGIS 10.1. Hasil penelitian menunjukkan bahwa B. kelimutuensis memiliki pola sebaran mengelompok, dengan nilai Ip sebesar 0,03. Temuan ini menunjukkan bahwa spesies tersebut cenderung tumbuh dalam kelompok-kelompok, yang kemungkinan dipengaruhi oleh faktor lingkungan mikro atau interaksi antarindividu.
Pilsbryoconcha exilis: Kajian Tentang Struktur, Komponen dan Nutrisi, serta Pemanfaatannya dalam Pengolahan Pencemaran Air Birhi, Damiana Nofita; Abi, Faustina de Yesu Prisila; Laka, Antonia Fransiska
Jurnal Sains dan Edukasi Sains Vol. 8 No. 2 (2025): Jurnal Sains dan Edukasi Sains
Publisher : Faculty of Science and Mathematics, Universitas Kristen Satya Wacana, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24246/juses.v8i2p173-184

Abstract

Perairan Indonesia hingga saat ini masih menunjukan adanya pencemaran, walaupun pada tahun 2020 Bappenas telah mengklaim bahwa air bersih nasional akan mencapai 100% pada akhir tahun 2024. Sistem pembuangan limbah dari berbagai sektor ke aliran sungai serta kurangnya kesadaran masyarakat akan pentingnya air bagi kesehatan menjadi tantangan terbesar dalam menghadapi persoalan ini. Upaya pemurnian air menggunakan penyaring telah banyak diteliti dan diterapkan. Salah satu penyaring alami adalah Pilsbryoconcha exilis (kerang kijing). Tujuan penulisan artikel review ini adalah mengkaji lebih dalam mengenai struktur dan morfologi kerang kijing, kandungan nutrisi, serta manfaatnya dalam mengatasi berbagai persoalan lingkungan. Kajian dilakukan dengan mengumpulkan data penelitian selama 10 tahun terakhir dari tahun 2014-2024 pada Google Scholar, Crossref, dan Elsevier. Data yang dikumpulkan sebanyak 54 artikel, yang kemudian dipilah berdasarkan kata kunci. Hasil pengolahan data mendapatkan 55 unsur dan senyawa dalam kerang kijing termasuk logam berat, dan berbeda pada setiap kerang. Hal ini dikarenakan ekosistem akan mempengaruhi pertumbuhan kerang seperti pH, suhu, kadar oksigen, hingga bakteri dan plankton yang menjadi makanan kerang. Pemanfaatan kijing sebagai bahan makanan terus mengalami peningkatan meski kijing telah diklaim mengandung logam berat yang berbahaya bagi konsumen. Penelitian terhadap teknik pengolahan kijing mendapatkan bahwa kandungan logam berat pada kijing akan menurun melalui perebusan pada suhu 100 oC. Disamping itu, pemanfaatan kijing sebagai biofilter, hidroksiapatit, antibakteri, serta antioksidan juga menunjukkan hasil yang menjanjikan. Penelitian lanjutan terhadap manfaat kerang kijing perlu terus dilakukan mengingat, kerang ini berkembang biak dengan baik di hampir seluruh wilayah perairan Indonesia, dan memiliki manfaat-manfaat yang belum dikaji secara mendalam.
PERSEPSI MAHASISWA PENDIDIKAN FISIKA UNIVERSITAS FLORES TENTANG PROGRAM MERDEKA BELAJAR KAMPUS MERDEKA (MBKM) Ika, Yasinta Embu; Laka, Antonia Fransiska; Supardi, Philipus Nerius; Rendo, Donatus; Birhi, Damiana Nofita
OPTIKA: Jurnal Pendidikan Fisika Vol. 6 No. 2 (2022): OPTIKA: Jurnal Pendidikan Fisika
Publisher : Department of Physics Education, Faculty of Teacher Training and Education, Universitas Flores

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37478/optika.v6i2.2194

Abstract

Penelitian ini bertujuan untuk mengetahui persepsi mahasiswa Program Studi Pendidikan Fisika FKIP Universitas Flores tentang program Merdeka Belajar Kampus Merdeka (MBKM). Penelitian ini merupakan penelitian deskriptif dengan pendekatan kuantitatif dengan metode survei. Data diperoleh dari populasi yakni 85 responden yang merupakan mahasiswa Program Studi Pendidikan Fisika Universitas Flores. Data dikumpulkan melalui kuesioner. Teknik analisis data dimulai dari pengumpulan data kemudian dianalisis menggunakan analisis deskriptif. Hasil dari penelitian survei ini menunjukkan bahwa mahasiswa pada program studi pendidikan fisika, Fakultas Keguruan dan Ilmu Pendidikan (FKIP) Universitas Flores memberikan respon yang positif terhadap program Merdeka Belajar Kampus Merdeka (MBKM).
Study of the efficiency of ZnAl2O4 as green nanocatalyst Birhi, Damiana Nofita; Laka, Antonia Fransiska
Inornatus: Biology Education Journal Vol. 4 No. 1 (2024): Inornatus: Biology Education Journal
Publisher : Univeritas Papua

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30862/inornatus.v4i1.584

Abstract

Waste from chemical reactions is still a hot issue to be discussed today. Green chemistry in its concept offers catalysts as an alternative to reducing waste resulting from chemical reactions. This literature study aims to examine the method of making ZnAl2O4 nanocatalysts and doping materials that are more effective in various reactions by considering the advantages and disadvantages of each. The content of the study includes the ZnAl2O4 nanocatalyst synthesis method, combination catalyst, and catalytic effectiveness in chemical reactions. Combustion, sol-gel, co-precipitation, hydrothermal, and microwave are the most common methods in the synthesis of ZnAl2O4. The use of precursors, fuel, and precipitating agents are very important factors when using combustion, sol-gel, and co-precipitation methods. Other factors that need to be considered are the raw material ratio, pH, and calcination temperature. The pH of the solution is 6-9 and the calcination temperature of 600oC – 800oC is the ideal point for producing nanocatalyst. The calcination temperature is lower to 300oC – 500oC when using hydrothermal and microwave as a synthesis method. ZnAl2O4 nanocatalyst has been identified as having good catalytic activity, but not higher than ZnAl2O4 combined with other catalysts. The combination of a catalyst with ZnAl2O4 spinel in hydrogenation, dehydrogenation, esterification, degradation, and organic synthesis has high catalytic activity with a conversion rate and selectivity of >70%.
Co-Authors Adzkia Qisthi Ismail Antonia Fransiska Laka Donatus Rendo Elvina Dhiaul Iftitah Elvina Dhiaul Iftitah Faustina De Yesu Prisila Abi Meike Tiya Kusuma Philipus Nerius Supardi Warsito Warsito Warsito Warsito YASINTA EMBU IKA Yosephina Payu Wao