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Synthesis of dihydropyrimidinone derivatives using kelubi fruit (Eleiodoxa conferta) as a catalyst and its antibacterial activity Sari, Ratih Puspita; Nurhadini, Nurhadini; Mahardika, Robby Gus
Asian Journal of Health and Applied Sciences Vol. 1 No. 1 (2022): Asian Journal of Health and Applied Sciences (AJHAS)
Publisher : Lighthouse Publishing

Kelubi fruit is one of the many fruits that grow in Bangka Belitung which has a sour taste. Kelubi fruit contains ascorbic acid, malic acid and oxalic acid. The potency and sour taste of Kelubi fruit can be used as a catalyst in the synthesis of dihydropyrimidinone compounds and activity as antibacterial. Dihydropyrimidinone compounds were synthesized using synthesis with the basic ingredients of benzaldehyde, urea and ethyl acetoacetate using natural catalysts that are more environmentally friendly. The purpose of this study was to determine the optimum volume, time and temperature catalyst used by kelubi fruit to synthesize pyrimidine-derived compounds as antibacterial. The optimization results on the synthesis of dihydropyrimidinone compounds using kelubi fruit water as a catalyst (Eleiodoxa conferta) with a lot of 0.3 mL catalyst, temperature of 50ºC and reaction time of 4 hours with yield of 46.75%. Antibacterial activity of dihydropyrimidinone compounds against Stapylococcus aureus bacteria at a concentration of 10 ppm, 30 ppm including the category and a concentration of 75 ppm including the medium category. Antibacterial activity against Eschericia coli bacteria at concentrations of 30 ppm and 75 ppm was categorized as weak.

Analisis Sifat Mekanik dan Permukaan pada Degradasi Plastik Konvensional Ristika Oktavia Asriza; Nurhadini Nurhadini; Qothrunnada Nur Azizah; Amelia Narulita
Jurnal Riset Fisika Indonesia Vol 4 No 1 (2023): Desember 2023
Publisher : Jurusan Fisika, Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jrfi.v4i1.4645

Currently, plastic waste that decomposes for a long time can damage the environment and natural ecosystems. therefore, an innovation was made to create an environmentally friendly plastic that decomposes faster in nature. The purpose of this research is to determine the degradation ability of environmentally friendly conventional biodegradable plastics. This research uses environmentally friendly conventional plastic materials. This plastic is degraded in 3 (three) ways, namely photodegradation (irradiation with UV C light), irradiation with sunlight, and biodegradation. Each degradation process lasts for 30 days. The research results showed that there was a decrease in the elongation at break value of plastic that had been degraded. This is caused by the breaking of bonds in the polymer chain. Apart from that, the plastic also experiences damage to its surface. This damage is characterized by cracks, the appearance of stains, and the appearance of mold or microorganisms on the plastic surface.

Adsorpsi Hg(II) Menggunakan Sargassum crassifolium dengan Adanya Pb(II), Cu(II) dan Fe(II) Nurhadini, Nurhadini; Silalahi, Imelda H.
Indonesian Journal of Chemical Research Vol 5 No 1 (2017): Edisi Bulan Juli (Edition For July)
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2017.5-nur

Amalgamation use mercury in mining process especially small-scale gold mining and it has been impacted on mercury contamination in environment. Mercury is one of heavy metal that toxic and can accumulate in water, soil and organism. Adsorption method is one of alternative option that effective to remove heavy metal. This method depends on adsorbent type, pH, adsorbent composition with metal or presence of several metal ions. Beside mercury, wastewater of mining gold have another metal ions such as Pb(II), Cu(II) dan Fe(II) can be found by human activity or naturally present. This research aim is to study effect of Pb(II), Cu(II), and Fe(II) in Hg(II) adsorption by using Sargassum crassofolium adsorbent. Research stages are adsorbent activation and mercury adsorption on binary and ternary system respectively in equimass amount of metals ion and equimolar amounts of metals. Based on adsorption analysis is known that Pb(II) and Cu(II) is Hg(II) competitor while Fe (II) is not Hg(II) competitor in adsoption by using Sargassum crassifolium. On binary system in equimass amount of metals ion and equimolar amounts of metals that the largest decreasing effect of Hg(II) adsorption in system contain Cu(II).

Separation of Thorium (Th) from Monazite Sand of Bangka Island using Primene JMT Solvent Extraction Method Claudia, Dita; Fabiani, Verry Andre; Nurhadini, Nurhadini; Prassanti, Riesna
EKSPLORIUM Vol 44, No 2 (2023): November 2023
Publisher : Badan Riset dan Inovasi Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/eksplorium.2023.6480

Thorium is an essential element as an alternative nuclear fuel to replace uranium. Thorium is found in the mineral monazite, which is a by-product of the alluvial tin mining process. Many methods have been used to extract and separate thorium from uranium and REEs from monazite, one of which is the organic solvent extraction method. In this research, the primene JMT, which is an extractant of primary amine compounds, was used in the method. The studied parameters are feed pH, JMT primene concentration, and stirring speed. The results show that the optimum conditions for Th extraction in monazite using solvent extraction method primene JMT were obtained at pH 0.5, extractant concentration of 2%, and stirring speed of 300 rpm with Th recovery of 94.05% while U and REE were not extracted.

Penerapan Media Pohon Kata Untuk Meningkatkan Kemampuan Menyusun Kalimat Pada Siswa Sekolah Dasar Nurhadini, Nurhadini; Khairudin, Khairudin; Fuaddudin, Fuaddudin
Journal of Instructional and Development Researches Vol. 4 No. 4 (2024): August
Publisher : Yayasan Indonesia Emerging Literacy Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53621/jider.v4i4.356

Permasalahan yang ada di kelas VI SD Muhammadiyah Kota Bima antara lain siswa yang kurang antusias dalam mengikuti pembelajaran, lingkungan kelas yang kaku, dan siswa yang tidak berkonsentrasi saat mengikuti kegiatan pembelajaran, hal ini disebabkan media yang diterapkan oleh guru tidak menarik dan menyenangkan, sehingga sangat berdampak pada hasil belajar siswa kelas VI terkait dengan menyusun kalimat. Tujuan penelitian ini adalah untuk mendeskripsikan hasil belajar siswa Kelas VI SD Muhammadiyah Kota Bima menggunakan media pohon kata, serta untuk meningkatkan keterampilan menyusun kalimat pada pembelajaran Bahasa Indonesia. Penelitian ini menggunakan penelitian Tindakan Kelas (PTK) dan dilakukan selama dua siklus dengan tahapan seperti perencanaan, pelaksanaan, pengamatan, dan refleksi dengan jumlah sampel 27 siswa. Hasil temuan menunjukan pada kegiatan pra siklus yang tuntas sebanyak 7 siswa sebanyak 26 % dan yang tidak tuntas 20 Siswa sebanyak 74 %, Peningkatan persentase pada siklus I sebanyak 63 %, sedangkan pada siklus II sebanyak 85 % dengan rincian pada siklus I 17 siswa yang tuntas dan tidak tuntas 10 siswa, untuk siklus II 23 siswa yang tuntas dan tidak tuntas 4 siswa. Dari hasil penelitian tersebut telah menunjukan angkatan peningkatan pada tiap siklus dan penerapan media pohon kata telah meningkatkan kemampuan menyusun kalimat pada siswa.

Phytochemical Screening of Acetone Extract of Rambai Leaves (Baccaurea motleyana) and Its Bioactivity as an Antibacterial Against Escherichia coli and Staphylococcus aureus Fransiska, Destalia; Roanisca, Occa; Nurhadini, Nurhadini
Jurnal Pijar Mipa Vol. 19 No. 4 (2024): July 2024
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram. Jurnal Pijar MIPA colaborates with Perkumpulan Pendidik IPA Indonesia Wilayah Nusa Tenggara Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpm.v19i4.6840

Bacteria are one of the organisms that may cause disease in the human body. Some bacteria which often infect the human body are Escherichia coli and Staphylococcus aureus. Both bacteria are pathogenic and possibly lead to various diseases such as diarrhea, urinary tract infections, and lung infections that have the potential to result in death. Treatment of infections caused by these bacteria can be done by giving antibiotics as therapy or a quick cure against infection. The use of antibiotics has side effects that result in resistance. Therefore, it is necessary to screen bioactive compounds with bioactivity as better antibacterial agents so that they can be developed into drugs that can cure diseases caused by bacteria. It is urgent to utilize natural antibacterials from plants to treat bacterial infections. This research aims to obtain the compound content, the total phenolic, and antibacterial activity of acetone extract of rambai leaves, so this research focused on rambai leaf acetone extract phytochemical content, total phenolic content, and antibacterial activity examination. Then, Phytochemical testing of rambai leaf acetone extract (Baccaurea motleyana) shows rambai leaves contain alkaloid compounds, tannins, flavonoids, saponins, steroids, and terpenoids that have the potential to be antibacterial. The examination of phenolic content was accomplished by using the Folin-Ciocalteau method. The total phenolic test results obtained were 68.63 mg EAG/g. Antibacterial testing was performed by implementing the disk diffusion method. Antibacterial testing of rambai leaf acetone extract Concentration of 20 %, 40%,60%, and 80% showed consecutive results in inhibition zones of 3.86 mm, 6.48 mm, 6.55 mm, and 6.63 mm with weak to medium activity for E. coli bacteria. However, S. aureus bacteria showed consecutive results in inhibition zones of 6.02 mm, 10.15 mm, 17.10 mm, and 19.46 mm with medium to intense activity. There has not been much research on rambai from Bangka Belitung, so there is an indispensable for further research regarding the total flavonoid and total alkaloid content of rambai leaves. Research may also carried out using a variety of solvents.

PENGEMBANGAN PRODUK OLAHAN HASIL LAUT MENJADI CAMILAN ANAK SEBAGAI UPAYA PENCEGAHAN STUNTING MENUJU MASYARAKAT SEHAT EKONOMI KUAT Roanisca, Occa; Nurhadini, Nurhadini; Layal, Kamalia; Robiana, Sella
Martabe : Jurnal Pengabdian Kepada Masyarakat Vol 7, No 3 (2024): MARTABE : JURNAL PENGABDIAN KEPADA MASYARAKAT
Publisher : Universitas Muhammadiyah Tapanuli Selatan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31604/jpm.v7i3.775-782

Prevalensi stunting tertinggi di Provinsi Kepulauan Bangka Belitung pada Kabupaten Bangka Barat. Desa Air Nyatoh merupakan desa dengan potensi hasil laut sangat tinggi, sehingga ketersediaan sumber protein tinggi. Permasalahan yang dihadapi masyarakat yakni kurangnya pengetahuan dan kreativitas dalam pengolahan hasil laut menjadi produk yang lebih bervariasi dan bergizi tinggi menjadi kendala dalam pemenuhan kebutuhan protein. Oleh karena itu, pada kegiatan pemberdayaan berbasis masyarakat ini dilakukan pendampingan kepada ibu-ibu PKK Desa Air Nyatoh untuk memproduksi makanan tambahan stunting berupa abon, crackers dan bakso berbahan baku sea food. Pada makanan tambahan tersebut akan ditambah temulawak dan madu yang dapat meningkatkan nafsu makan. Tujuan kegiatan ini untuk meningkatkan pengetahuan dan kemampuan mitra dalam produksi camilan berbasis hasil laut sebagai pencegah stunting dan dijadikan produk unggulan desa yang berdaya saing. Metode pelaksanaan berupa sosialisasi dan pendampingan secara langsung ke mitra sasaran. Hasil pada kegiatan ini, tim pengabdi melakukan sosialiasi dan pendampingan untuk peningkatan pengetahuan dan keterampilan mitra sasaran untuk memproduksi produk camilan yang memenuhi standar bersih. Melalui kegiatan ini mitra sasaran dibekali pengetahuan mengenai tata cara pengajuan sertifikat PIRT, tata kelola UMKM agar terjaga eksistensi dan pengembangannya, serta asupan yang tepat bagi anak stunting. Kegiatan pendampingan secara langsung formulasi produk abon, crackers dan bakso dengan kombinasi temulawak dan madu telah dilakukan oleh tim pengabdi dan mitra sasaran.

Analisis Sifat Mekanik dan Permukaan pada Degradasi Plastik Konvensional Asriza, Ristika Oktavia; Nurhadini, Nurhadini; Azizah, Qothrunnada Nur; Narulita, Amelia
Jurnal Riset Fisika Indonesia Vol 4 No 1 (2023): Desember 2023
Publisher : Jurusan Fisika, Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jrfi.v4i1.4645

Currently, plastic waste that decomposes for a long time can damage the environment and natural ecosystems. therefore, an innovation was made to create an environmentally friendly plastic that decomposes faster in nature. The purpose of this research is to determine the degradation ability of environmentally friendly conventional biodegradable plastics. This research uses environmentally friendly conventional plastic materials. This plastic is degraded in 3 (three) ways, namely photodegradation (irradiation with UV C light), irradiation with sunlight, and biodegradation. Each degradation process lasts for 30 days. The research results showed that there was a decrease in the elongation at break value of plastic that had been degraded. This is caused by the breaking of bonds in the polymer chain. Apart from that, the plastic also experiences damage to its surface. This damage is characterized by cracks, the appearance of stains, and the appearance of mold or microorganisms on the plastic surface.

Separation of Thorium (Th) from Monazite Sand of Bangka Island using Primene JMT Solvent Extraction Method Claudia, Dita; Fabiani, Verry Andre; Nurhadini, Nurhadini; Prassanti, Riesna
EKSPLORIUM Vol. 44 No. 2 (2023): NOVEMBER 2023
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/eksplorium.2023.6480

Thorium is an essential element as an alternative nuclear fuel to replace uranium. Thorium is found in the mineral monazite, which is a by-product of the alluvial tin mining process. Many methods have been used to extract and separate thorium from uranium and REEs from monazite, one of which is the organic solvent extraction method. In this research, the primene JMT, which is an extractant of primary amine compounds, was used in the method. The studied parameters are feed pH, JMT primene concentration, and stirring speed. The results show that the optimum conditions for Th extraction in monazite using solvent extraction method primene JMT were obtained at pH 0.5, extractant concentration of 2%, and stirring speed of 300 rpm with Th recovery of 94.05% while U and REE were not extracted.

SINTESIS α-TERPINEOL DARI MINYAK ATSIRI TUMBUHAN SAPU-SAPU DENGAN MENGGUNAKAN KOMBINASI KATALIS ASAM ALAMI BUAH JERUK KUNCI DAN ASAM SINTETIS Ependi, Eresti; Roanisca, Occa; Nurhadini, Nurhadini
Stannum : Jurnal Sains dan Terapan Kimia Vol 7 No 2 (2025): October 2025
Publisher : Department of Chemistry - Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/76wtwt95

Synthesis is an integration of two or more existing elements to produce a new result. Key orange (Citrus x microcarpa Bunge) is a Bangka Belitung plant that contains citric acid with a high acidic taste. Its high acidic nature can be used as a catalyst that can accelerate the reaction rate in synthesizing an α-terpineol compound from α-pinene contained in broomstick essential oil. The synthesis of α-terpineol can be done using combined and uncombined catalysts, namely 15% sulfuric acid, 99.5% acetic acid and natural citric acid from key lime juice. This study aims to determine the optimum composition of the catalyst combination of sulfuric acid, acetic acid and key lime juice in synthesizing α-terpineol compounds and the level of α-terpineol produced from the synthesis. The optimum result of the combination of catalysts that can synthesize α-pinene into α-terpineol quite well is using 15% sulfuric acid as much as 1 ml, 99.5% acetic acid as much as 1 ml and citric acid from key orange juice as much as 3 ml. The results of α-terpineol content of each catalyst are Product 1 by 33.14%, Product 2 by 6.36%, Product 3 by 1.00%, Product 4 by 17.32% and Product 5 by 18.43%.

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