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All Journal Chemistry Indonesian Journal of Chemical Research Fullerene Journal of Chemistry Jurnal Abdimas Kartika Wijayakusuma Innovation for Community Service Journal
Hellna Tehubijuluw
Department of Chemistry, Faculty of Mathematics and Natural Science, State University of Pattimura, Ambon, Jl. Ir. M. Putuhena, Poka, Ambon 97123
Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemistry Education Engineering Environmental Science Social Sciences Other

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Screening Of Phytochemicals And Bioactivity Test Of The Leaves Breadfruit (Artocarpus altilis) Rosmawaty, Rosmawaty; Tehubijuluw, Hellna
Indonesian Journal of Chemical Research Vol 1 No 1 (2013): Edisi Pertama (First Edition)
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2013.1-ros

Abstract

Screening phytochemical and bioactivity test of breadfruit leaves (Arthocarpus altilis) have been done. The samples were used in the study extracted by maceration method with some solvent polarity enhanced, there are: n-hexane, chloroform, ethyl acetate, and methanol. The bioactivity test use BST (Brine Shrimp Lethality test). The activity assay use brine shrimp A. salina Leach. Content of the secondary metabolites in four crude extract of leaves of breadfruit (A. altilis) are alkaloids, steroids, terpenoids, and flavonoids. Whereas only phenolic compounds contained in the crude extract of chloroform and methanol. The saponins content only in the crude extract methanol. The fourth test of bioactivity of the crude extract of leaves of breadfruit there are: n-hexane, chloroform, ethyl acetate, and methanol had LC50: > 1000 mg / mL; 387.436 mg / mL; 415.623 mg / mL; and 392.826 mg / mL respectively. The crude extract of chloroform, ethyl acetate, and methanol classified active in the BST test to brine shrimp A. salina, while the crude extract n-hexane classified as inactive. The Leaves of breadfruit (A. altilis) has potential to be used as medicine.
Kinetic Study And Isoterm Adsorption Of Pb Metal In Ouw Village Clay Activated Ammonium Nitrate Salt Sekewael, Serly J.; Tehubijuluw, Hellna; Reawaruw, Delvika R.
Indonesian Journal of Chemical Research Vol 1 No 1 (2013): Edisi Pertama (First Edition)
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2013.1-ser

Abstract

Kinetics studies and adsorption isotherms of Pb metal have been conducted on activated clay salts of ammonium nitrate (NH4NO3). Clays used are taken from Ouw village, Central Maluku. Clay activated by soaking in a solution of NH4NO3 700 ppm for 5 hours, then filtering and heating in a furnace at 550 oC for 4 hours. The optimum adsorption of metal ions Pb (II) by activated clay ammonium nitrate occurs at pH 4 with a contact time of 4 hours and followed the Freundlich adsorption isotherm pattern with a Kf value of 1.6193 x 10-8 mg/g and n value of 0.2059. Pb adsorption kinetics followed the pseudo-second-order Lagergren equation with the value of the adsorption rate constant (k2, ads) of 0.1248 g mg-1 min-1 and Xe value of 4.4783 mg/g.
Intercalation Of Clay By Surfactant And Its Application As Adsorbent Of Lead Ion Sekewael, Serly J.; Tehubijuluw, Hellna; Lefmanut, Isabella C.
Indonesian Journal of Chemical Research Vol 3 No 1 (2015): 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.2015.3-ser

Abstract

Research on natural clay intercalation with a surfactant has been done. The surfactant used is a quaternary ammonium salt type is cetil trimethyl ammonium bromide (CTAB). Intercalation process is carried out by stirring a suspension of clay and quaternary ammonium salt for 24 hours. After the intercalation process, palmitic acid are added, then the intercalated clay is used as an adsorbent ion Pb2+ distance between layers of clay after intercalated can be analyzed using X-ray diffraction. The distance between the layers increases from 15.99 to 19.45Ã…. Intercalated surfactant used to adsorb metals Pb2+ ions in solution with a variety of conditions such as contact time and concentration. The results of the analysis indicated using AAS then used to determine the adsorption capacity based on the optimum contact time optimum concentration and absorption. Adsorption capacity is equal to 8.092 mg/g.
Characterization and Kinetic Study of Methylene Blue Photocatalytic on ZnO/ZSM-5 Tehubijuluw, Hellna; Souhoka, Fensia Analda; Kusumawati, Yuly; Prasetyoko, Didik; Subagyo, Riki; Nugraha, Reva Edra; Jalil, Aishah Abdul
Indonesian Journal of Chemical Research Vol 11 No 2 (2023): Edition for September 2023
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598//ijcr.2023.11-hln

Abstract

Photodegradation of organic pollutants depends significantly on the structure of metal oxide-based semiconductor photocatalysts. ZnO/ZSM-5 has shown the potential to significantly improve its photocatalytic efficiency for removing waterborne pollutants. ZnO/ZSM-5 has been reported to be an active catalyst for degrading methylene blue. These methods commonly involve various catalytic reactions, with the Langmuir-Hinshelwood process being used to describe the reaction kinetics. A kinetic study on the photocatalytic degradation of methylene blue using ZnO/ZSM-5 was conducted under UV-LED lamp irradiation. ZnO/ZSM-5 was characterized using XRD, SEM, and N2 adsorption-desorption, and it was prepared via the impregnation method. The interaction between ZnO/ZSM-5 and methylene blue solutions over a period of 30 to 180 minutes was monitored using a UV-Vis spectrophotometer. The photocatalytic degradation of methylene blue followed first-order rate kinetics. The Langmuir-Hinshelwood (L-H) kinetic analysis revealed that the photocatalytic reaction constant (kc) was 4.207 L.mg-1. menit-1, and the Langmuir-Hinshelwood constant (K) was 261.509 L.mg-1.
Pemanfaatan Buah Kelapa sebagai VCO di SMK Negeri 6 Ambon Pentury, Evangeline; Telussa, Ivonne; Kapelle, Imanuel Berly Delvis; Tehubijuluw, Hellna; Souhoka, Fensia Analda; Runtu, Irwan
Innovation for Community Service Journal Vol 2 No 2 (2024): Oktober 2024
Publisher : Department of Chemistry

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/icsj.v2i2.15691

Abstract

VCO atau Virgin Coconut Oil, adalah minyak kelapa murni yang diekstrak dari daging kelapa segar tanpa melalui proses pemanasan. VCO semakin populer sebagai produk alami yang multifungsi, baik untuk konsumsi maupun perawatan kecantikan. Tujuan dari pembuatan VCO ini adalah untuk memberikan informasi pemanfaatan hasil kelapa yang berupa santan yang dapat diolah kembali menjadi minyak VCO yang memiliki nilai jual yang tinggi dan memiliki kegunaan sebagai obat maupun untuk produk kecantikan. Pemateri bersama mitra melakukan praktek bersama yang diawali dengan melakukan demo pembuatan VCO oleh pemateri kemudian akan diikuti oleh para siswa SMK Negeri 6 Ambon. Prosedur pembuatan dimulai dari kelapa yang kering diparut, diperas lalu didiamkan selama 4 jam untuk memisahkan santan kental dan air. Santan kemudian didiamkan kembali selama 24 jam sampai terbentuk 3 lapisan yaitu air, minyak dan ampas santan. Minyak yang didapat dipisahkan lalu disaring dan dimasukkan kedalam botol kemasan. VCO siap untuk dikonsumsi dan dijual. Tahapan-tahapan pembuatan VCO dapat diikuti dengan baik oleh para siswa SMK Negeri 6 Ambon.
Pemanfaatan Sayur Bayam Sebagai Cemilan Sehat untuk Mengatasi Stunting di Desa Hatusua, Kab. Seram Bagian Barat, Provinsi Maluku Male, Yusthinus Thobias; Sohilait, Hanoch Julianus; Sekewael, Serly Jolanda; Kapelle, Imanuel Berly Delvis; Tehubijuluw, Hellna; Bijang, Chaterina Manukpadang; Hattu, Nikmans; Telussa, Ivonne; Siahaya, Antho Netty; Rosmawaty, Rosmawaty; Sohilait, Mario Rowan
Innovation for Community Service Journal Vol 3 No 1 (2025): April 2025
Publisher : Department of Chemistry

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/icsj.v3i1.19628

Abstract

Stunting merupakan masalah kesehatan yang berdampak pada pertumbuhan fisik dan perkembangan kognitif anak. Desa Hatusua, Seram Bagian Barat, menghadapi tantangan dalam pemenuhan gizi seimbang akibat rendahnya konsumsi makanan bergizi. Kegiatan pengabdian masyarakat ini bertujuan untuk meningkatkan kesadaran masyarakat tentang pentingnya gizi serta memperkenalkan inovasi pengolahan sayur bayam sebagai cemilan sehat yang menarik bagi anak-anak. Metode yang digunakan dalam kegiatan ini mencakup survei awal, dan pelatihan pembuatan cemilan berbahan dasar bayam. Hasil kegiatan menunjukkan adanya peningkatan pemahaman masyarakat mengenai pentingnya konsumsi makanan bergizi, serta perubahan pola makan anak-anak yang lebih menerima cemilan berbahan dasar bayam. Selain itu, beberapa peserta berantusias mengikuri pelatihan dalam pembuatan kripik bayam berbasis cemilan sehat sebagai peluang ekonomi lokal. Keberhasilan program ini mengindikasikan bahwa pendekatan berbasis pangan lokal dan keterlibatan masyarakat secara aktif dapat menjadi solusi efektif dalam penanggulangan stunting. Program ini berpotensi dikembangkan lebih luas dengan dukungan pemerintah dan berbagai pihak terkait guna menciptakan keberlanjutan dalam peningkatan kualitas gizi masyarakat.
Eksplorasi Alat Laboratorium Kimia Untuk Menumbuhkan Minat Sains Siswa SMP Negeri 13 Maluku Tengah Tehubijuluw, Hellna; Souhoka, Fensia Analda; Rutu, Irwan
Jurnal Abdimas Kartika Wijayakusuma Vol 6 No 3 (2025): Jurnal Abdimas Kartika Wijayakusuma
Publisher : LPPM Universitas Jenderal Achmad Yani

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26874/jakw.v6i3.941

Abstract

Banyak siswa tingkat SMP belum memiliki pemahaman yang cukup tentang alat-alat laboratorium kimia, yang sering kali menyebabkan rasa cemas saat menghadapi praktikum perdana. Melalui kegiatan ini, siswa SMP Negeri 13 Maluku Tengah diberikan informasi awal serta latihan dasar penggunaan alat laboratorium, dengan tujuan memupuk minat terhadap ilmu sains, khususnya kimia. Kegiatan melibatkan analisis kebutuhan, penyusunan konten ajar, serta pelaksanaan sesi interaktif berbasis teori dan praktik. Pelaksana kegiatan adalah tim dosen dari Program Studi Kimia Universitas Pattimura, dan peserta mencakup siswa kelas VII sampai IX. Berdasarkan evaluasi, peserta menunjukkan peningkatan pemahaman mengenai identifikasi alat, fungsinya, serta penggunaan yang aman. Kegiatan ini juga mempererat hubungan kemitraan antara sekolah dan perguruan tinggi dalam rangka meningkatkan mutu pendidikan sains di wilayah Maluku.
Immobilization of Humic Acid on Chitosan and Its Application as an Adsorbent for Mercury (Hg²⁺) Ions in Freshwater Media Uktolseya, Lady Diana; Male, Yusthinus T; Tehubijuluw, Hellna
Jurnal Kimia Fullerene Vol 11 No 1: Fullerene Journal Of Chemistry
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37033/fjc.v11i1.750

Abstract

Mercury (Hg²⁺) contamination in freshwater is a serious global environmental issue, posing toxic effects on both human health and aquatic ecosystems. This study aims to immobilize humic acid onto chitosan and evaluate its effectiveness as an adsorbent for mercury ions (Hg²⁺) in a freshwater medium. Humic acid was isolated from peat soil and characterized using Fourier Transform Infrared (FTIR) Spectroscopy. Commercial chitosan was used as the supporting matrix. The immobilization process was carried out by mixing humic acid and chitosan solutions under controlled pH conditions. The resulting humic acid–chitosan adsorbent was then tested for its adsorption capacity toward mercury ions at various initial concentrations. FTIR characterization results confirmed the successful immobilization of humic acid onto chitosan, as indicated by the appearance of characteristic absorption bands corresponding to functional groups from both components. Adsorption tests showed that the humic acid–chitosan adsorbent exhibited a significant ability to remove mercury ions from freshwater, with optimum adsorption observed at a concentration of 100 ppm. The maximum adsorption capacities of humic acid, chitosan, and humic acid–chitosan were 99.83 mg/g, 99.90 mg/g, and 99.89 mg/g, respectively. This study provides important scientific insights into the potential of humic acid immobilized on chitosan as an alternative material for reducing heavy metal pollution in aquatic environments
Co-Authors Aishah Abdul Jalil Bijang, Chaterina Manukpadang Didik Prasetyoko Fensia Analda Souhoka Hanoch J Sohilait Hattu, Nikmans Ivonne Telussa Kapelle, Imanuel B. D. Kusumawati, Yuly Lefmanut, Isabella C. Nugraha, Reva Edra Pentury, Evangeline R, Irwan Reawaruw, Delvika R. Rosmawaty Harahap Sekewael, Serly J. Sekewael, Serly Jolanda Siahaya, Antho Netty Sohilait, Mario Rowan Subagyo, Riki Uktolseya, Lady Diana Yusthinus T. Male