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All Journal VALENSI Natural Science: Journal of Science and Technology Jurnal Spektran The Journal of Pure and Applied Chemistry Research MPI (Media Pharmaceutica Indonesiana) KOVALEN: Jurnal Riset Kimia Jurnal Kimia Mulawarman Indonesian Journal of Chemistry Jurnal Ilmiah Teknik Kimia Sewagati

Ni Ketut Sumarni

Department Of Chemistry, Tadulako University, Jl. Sukarno-Hatta Km 9, Palu 94148, Central Sulawesi, Indonesia

Author-ID : 329959

Arts Humanities Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Education Engineering Health Professions Immunology & microbiology Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Medicine & Pharmacology Public Health Social Sciences Other

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Sintesis Metil Ester Asam Lemak dari Biji Alpukat (Parsea americana Mill) Menggunakan Polimer Penyangga Katalis Berbahan Dasar Eugenol: Synthesis of Fatty Acid Methyl Ester from Avocado Seeds (Parsea americana Mill) using Polymer Support Catalyst Based on Eugenol Sumarni; Erwin Abdul Rahim; Ni Ketut Sumarni; Ruslan; Hardi Ys.; Moh. Mirzan
KOVALEN: Jurnal Riset Kimia Vol. 6 No. 3 (2020): Edisi Desember
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2020.v6.i3.13053

Research on the manufacture of methyl esters from avocado seeds (Parsea americana Mill) with eugenol-based catalysts has been conducted. The aim is to determine the catalyst concentration used to produce methyl esters with the highest rendement and determine the composition of fatty acid methyl ester in avocado seeds. This study was used variations in concentrations of 0.25%, 1%, 1.75%, 2.25%, and 3%. The results of this study showed that the best concentration is 2.25% with the calculation of the results of 24.8% methyl esters in avocado seeds, namely lignoceric and octadecenoic acid methyl ester. Keywords: Avocado seeds, fatty acid methyl esters

Siklisasi Sitronelal Menggunakan Polimer Penyangga Katalis H2SO4 Berbahan Dasar Eugenol: Citronellal Cyclization Using Polymer Based-Eugenol Supported H2SO4 Catalyst Moh. Rifki Saputra; Erwin Abdul Rahim; Husain Sosidi; Ni Ketut Sumarni
KOVALEN: Jurnal Riset Kimia Vol. 7 No. 1 (2021): Edisi April
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2021.v7.i1.13660

Research on citronellal cyclization using a polymer based on eugenol supported H2SO4 catalyst has been carried out. The study aim was to determine the ratio of the addition of polymer based-eugenol supported H2SO4 catalyst used to produce the highest isopulegol. Citronellal cyclization was carried out using variations of catalyst concentration (1, 2, 3, 4, and 5%) and reaction time (30, 60, and 90 minutes). The results have obtained a yield of 50.67% found in the catalyst concentration of 1% and 90 minutes reflux time. From the results of GC-MS analysis, 29 compounds were read and among them isopulegol which was read at retention time 19.703 at peak 9 and peak area 4.76%. And the isopulegol results obtained are 11.34%.

Pembuatan Konsentrat Protein Ampas Kelapa (Cocos nucifera L.) Bebas Lemak pada Berbagai Konsentrasi NaOH: Production of Fat-Free Coconut Pulp (Cocos nucifera L.) Protein Concentrates at Various NaOH Concentrations Ulayya Kasio; Syaiful Bahri; Husain Sosidi; Khairuddin; Ni Ketut Sumarni; Ahmad Ridhay
KOVALEN: Jurnal Riset Kimia Vol. 7 No. 3 (2021): Edisi Desember
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2021.v7.i3.14235

Coconut pulp contains up to 18.2% protein which is one of the wastes from coconut oil processing. Protein from coconut pulp can be used in the manufacture of protein concentrates which are widely used in the food industry. The purpose of this research is to determine the concentration of NaOH that can produce the yield and protein content of coconut pulp protein concentrate. Coconut pulp protein was extracted with NaOH at various concentrations of 0.5, 1, 1.5, 2, and 2.5 M, then continued with salting out using salt (NH4)2SO4 with a saturation of 65%. The crude protein content of coconut pulp protein concentrate was determined by the Kjeldahl method. The results showed that the use of 0.5 M NaOH resulted in the highest protein content of coconut pulp protein concentrate, which was 71.30% with a yield of 14.42%.

KAJIAN AKTIVITAS ANTIOKSIDAN MIKROKAPSUL EKSTRAK KULIT TERONG UNGU (Solanum melongena L) Efin Lestari; Ni Ketut Sumarni; Mappiratu Mappiratu
KOVALEN: Jurnal Riset Kimia Vol. 5 No. 3 (2019): Edisi Desember
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Study about antioxidant activity of microcapsule of purple eggplant (Solanum melongena L) peel extract has ben done. The research aimed to find the best pH and coating ratio for yielding microcapsule with the highest antioxidant activity. It was done by applying 5 levels of both pH variation of 2, 3, 4, 5, 6 and maltodextrin ratio of 1:1, 2:1, 3:1, 4:1, 5:1 (w/v). The determination of antioxidant activity was done by DPPH method. The result showed that at pH 2 and 1:1 of maltodextrin coating ratio were the best condition to yield the highest antioxidant activity i.e 32.54 % and 96.31 %, respectively. Keywords: Purple eggplant peel, maltodextrin, microcapsule, antioxidant activity

Limbah Sabut Kelapa Muda (Cocos nucifera L.) sebagai Sumber Pewarna Kain: Young Coconut Coir (Cocos nucifera L.) Waste as a Source of Cloth Dye Ni Ketut Sumarni; Umma Fahriah Soleh; Nurhaeni; Prismawiryanti
KOVALEN: Jurnal Riset Kimia Vol. 7 No. 3 (2021): Edisi Desember
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2021.v7.i3.15642

Young coconut coir (Cocos nucifera Linn.) waste has the potential to be processed into a useful product, namely as a source of natural dyes, especially in cotton fabrics. Processing is carried out through a maceration process for 72 hours using 96% ethanol as solvent. The obtained extract was applied on cotton cloth with various concentrations of the extract solution, 5, 10, 15, 20, and 25%, and various soaking times of the fabric in the extract for 60, 90, 120, 150, and 180 minutes. The extract was analyzed using Uv-Vis Spekctrofotometer it showed that the ethanol extract or dye that is absorbed into the cotton fabric with various concentrations is 3.43, 4.82, 6.61, 7.79, and 9.03%, respectively. The various soaking times show that on the other hand that the extract absorbed into the fabric was successfully obtained around 7.75, 9.64, 10.81, 11.65, and 12.04%. The results show that the concentration of the extract solution and the increasing length of soaking time can increase the percentage of extract or dye absorbed in cotton fabrics

Penggunaan Karbon Aktif dari Tandan Kosong Kelapa Sawit Teraktivasi NaOH pada Penyerapan Ion Pb(II): Utilization of NaOH-Activated Carbon from Oil Palm Empty Fruit Bunches on Pb(II) Ion Absorption Minda M; Husain Sosidi; Ni Ketut Sumarni; Hardi Ys.; Ruslan; Nov Irmawati Inda; Moh. Mirzan
KOVALEN: Jurnal Riset Kimia Vol. 8 No. 1 (2022): April Edition
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2022.v8.i1.15847

Oil palm empty fruit bunches (OPEFB) are plantation waste that has the potential to be used as activated carbon. The main component of OPEFB is lignocellulosic which can be a source of activated carbon and utilized for Pb2+ ion adsorption. The use of activated carbon activated by NaOH still requires optimization, especially in determining the contact time and optimum adsorption pH. This study aims to determine the effect of pH and contact time on the adsorption of Pb2+ and to determine the efficiency of the adsorbent on the adsorption of Pb2+. In this study, activated carbon from OPEFB was carbonized at 300oC for 1 hour, followed by activation using NaOH 0.5%. The results showed that the use of pH 5 and a contact time of 90 minutes had a relatively higher Pb2+ adsorption than other conditions. However, the use of variations in pH and contact time had no significant effect on the adsorption of Pb2+ ions. Adsorbents with variations in pH 4, 5, 6, 7, and 8 were able to absorb Pb2+ of 99.73%, 99.86%, 99.74%, 99.79%, and 99.80%, respectively. Adsorbents with variations in contact time of 30, 60, 90, 120, and 150 minutes were able to absorb Pb2+ of 99.28%, 99.40%, 99.48%, 99.44%, and 99.48%, respectively.

DAYA HAMBAT EKSTRAK ETANOL SABUT KELAPA (Cocos nucifera Linn) TERHADAP PERTUMBUHAN Staphylococcus aureus DAN Escherichia coli PADA TAHU Ni Ketut Sumarni; Rahmawati Rahmawati; Syamsuddin Syamsuddin; Ruslan Ruslan
JURNAL KIMIA MULAWARMAN Vol 17 No 1 (2019)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar

Telah dilakukan pengujian daya hambat ekstrak etanol sabut kelapa (Cocos nucifera Linn) terhadap pertumbuhan Staphylococcus aureus dan Escherichia coli pada tahu. Penelitian ini bertujuan untuk mengetahui konsentrasi ekstrak etanol sabut kelapa yang dapat menghambat pertumbuhan mikroba S.aureus dan E.coli pada tahu. Sabut kelapa diekstrak menggunakan etanol 96% dan di aplikasikan pada tahu dengan variasi konsentrasi 1000 ppm, 2000 ppm, 3000 ppm, 4000 ppm, 5000 ppm, 6000 ppm dan 7000 ppm. Selanjutnya diaplikasikan pada tahu dengan metode cawan menggunakan total plate count. Hasil perendaman ekstrak etanol sabut kelapa terhadap tahu menunjukkan konsentrasi ekstrak yang paling menghambat yaitu pada konsentrasi 7000 ppm dengan waktu 24 jam sebesar 3751 Cfu/mL untuk bakteri S.aureus dan konsentrasi 7000 ppm dengan waktu 96 jam pada bakteri E.coli. Ambang batas cemaran mikroba pada tahu sesuai SNI 2009 nomor 7388 yaitu 5Ã—104 koloni/mL.

Antibacterial and Antioxidant Activities of Polyeugenol with High Molecular Weight Erwin Abdul Rahim; Nur Istiqomah; Gilang Almilda; Ahmad Ridhay; Ni Ketut Sumarni; Indriani Indriani
Indonesian Journal of Chemistry Vol 20, No 3 (2020)
Publisher : Universitas Gadjah Mada

This study was aimed to prepare polyeugenol with high molecular weight and to evaluate its antibacterial and antioxidant activities. First, polyeugenol was synthesized from eugenol in the presence of H2SO4-CH3COOH (4:1) as catalyst. The synthesized polyeugenol was weighed by using viscometer, revealing its high molecular weight of (7.76–21.9) × 105 g/mol. Furthermore, the antibacterial activity of the polyeugenol was conducted against Staphylococcus aureus and Escherichia coli bacteria. It was conducted by applying well diffusion method at 1, 2, 3, 4 and 5% concentrations to observe inhibition zones, in which the tests showed that the antibacterial activity of the polyeugenol against S. aureus were 17.42, 17.76, 18.79, 21.42 and 22.55 mm, while those against E. coli were 15.87, 17.23, 17.56, 18.24 and 19.21 mm, respectively. In short, these results indicated a strong antibacterial activity. Then, tests on antioxidant activity against free radical DPPH (2,2-diphenyl-1-pycrylhydrazyl) gave the IC50 value of 80.47 µg/mL, indicating a strong antioxidant activity. Therefore, the polymer synthesized in this work has a high potential to be applied in various biomedical applications.

Penambahan Ekstrak Etanol Buah Naga Merah (Hylocereus polyrhizus) Afkir pada Pembuatan Sabun Cair Berbasis Virgin Coconut Oil Windi Windi; Ni Ketut Sumarni; Jaya Hardi
Jurnal Ilmiah Teknik Kimia Vol 6, No 2 (2022): JURNAL ILMIAH TEKNIK KIMIA
Publisher : Program Studi Teknik Kimia, Universitas Pamulang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32493/jitk.v6i2.20973

Rejected Dragon fruit (Hylocereus polyrhizus) is rich in anthocyanin compounds that can be used as additional ingredients in liquid soap formulas, thereby increasing the quality of soap as an antioxidant that protects the skin from the effects of sunlight and pollution. The purpose of this research was to determine the mass of rejected dragon fruit extract which produced liquid soap with the highest pH and foam stability and the best viscosity value. The research design used was a completely randomized design (CRD) with a factorial pattern with the independent variable being the concentration of rejected dragon fruit extract with four treatment levels of 0, 1.5, 3, and 4.5 grams of extract per 250 grams of soap formula and storage time consisting of four levels of 0, 7, 14, and 21 days. The best liquid soap formula was obtained when using a rejected dragon fruit extract concentration of 1.5 grams per 250 grams of soap formula (SW1 formula) with a foam stability value of more than 90% until 21 days of storage. Formula SW1 also has a stable pH during storage, which is in the pH range of 7 – 9. The viscosity value of the SW1 formula reaches 13.25 N/m2 with a free alkali value of 2.48%. The SW1 formula with a rejected dragon fruit extract content of 1.5 grams per 250 grams of soap formula can be developed as a new formula for the manufacture of liquid soap which is rich in antioxidant compounds.

Aktivitas Antibakteri Ekstrak Kulit Batang Tumbuhan Johar (Senna siamea Lam) pada Berbagai Polaritas Pelarut : Antibacterial Activity of Johar (Senna siamea Lam) Stem Bark Extract on Various Solvent Polarities Djumidar; Abd. Rahman Razak; Ahmad Ridhay; Ni Ketut Sumarni; Syamsuddin; Jusman; Nurhaeni; Erwin Abdul Rahim
KOVALEN: Jurnal Riset Kimia Vol. 8 No. 2 (2022): August Edition
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2022.v8.i2.15970

Johar plant is a type of plant from the Fabaceae family which is widely used in traditional medicine such as malaria, itching and diabetes medicine. This study aims to determine the antibacterial activity of Johar stem bark extract with different levels of solvent polarity on the growth of Staphylococcus aureus and Escherichia coli bacteria and to determine the active compound class by TLC-Bioautography. The extraction of active compounds used a multilevel maceration method starting with n-hexane (non polar), followed by ethyl acetate (semi-polar) and ethanol (polar) solvents. Antibacterial activity testing was carried out by diffusion well method with a concentration variant of 25% and 50%. The results showed that n-hexane, ethyl acetate, and ethanol extract had antibacterial activity against the two test bacteria. Ethyl acetate and ethanol extract from Johar stem bark at a concentration of 50% were classified as very strong antibacterials with inhibition zone diameters against S. aureus, which were 22.02±0.84 mm and 20.16±0.23 mm, respectively. The results of the TLC-Bioautography test showed that the three test extracts had strong antibacterial activity against S. aureus and E. coli. In the n-hexane extract with n-hexane: ethyl acetate (9:1) eluent using Lieberman-Burchard spray reagent, it was suspected that triterpenoid compounds were present. In ethyl acetate extract with n-hexane: ethyl acetate (6:4) eluent and ethanol extract with chloroform: methanol (8:2) eluent using FeCl3 1% spray reagent, it was suspected that the tannin compound was present in both extracts.

Co-Authors A.A. Ketut Agung Cahyawan W Abd. Rahman Abd. Rahman Razak Abd. Rahman Razak Abd. Rahman Razak Razak Ahmad Ridhay Aini Auliana Amar Amiluddin, Muh. Rafiq Andi Saifah Anita Anita Asri Wulandari Ayu Anggraini Puspitasari Bambang Sardi Darman Panggalo Dewi Irtawati, Dewi Dharmayanti, Gusti Ayu Putu Candra Diharnaini Diharnaini Djumidar Dwi Juli Puspitasari Efin Lestari Eka Dwiyanti Tombilayuk Erwin Abdul Rahim Evi Sulastri firmasari firmasari Fisty Sumangkut Fridian Aprilia, Natasya Gilang Almilda Hardi Ys Hardi Ys. Henny H. Veronika Husain Sosidi I Nyoman Adi Putra I Nyoman Yudha Astana Ida A M D Yadnyani Indriani Indriani Jaya Hardi Jusman, Jusman Khaerunisa Khaerunisa, Khaerunisa Khairuddin Khairuddin Kostriana Daniel Laksono Trisnantoro Lewi Michal Pakiding Lisma Habiba Lutvina Vitasari Mahfud Mahfud Mappiratu Mappiratu Mappiratu Mappiratu Mappiratu Mappiratu Mappiratu Mappiratu Marsela, Anggi Maulana, Asad Minda M Miswan Moh. Mirzan Moh. Rifki Saputra Muala, Bahran Musafira Musafira Musafira Musafira Musafira Musafira Nea, Sirah Diniati Nov Irmawati Inda Novitaliani Kea Nur Istiqomah Nurfita Sari Nurhaeni Nurhaeni Nurhaeni Nurhaeni Nurhaeni Nurhaeni Nurhalisa, Sitti Nurlina Ibrahim Nurviani Nurviani Pasjan Satrimafitrah Prismawiryanti Prismawiryanti Putri Wahyuni Rahma Wati Rahmawati Rahmawati Riski, Mutiara Zalfa Ruslan Ruslan Ruslan Sarapun, Veky Serli Jayanti Setyaningrum, Annisa Shiomori, Koichiro Sopyan Sopyan Sulfitri Suardi Sumarni Syaiful Bahri Syaiful Bahri Syaiful Bahri Syamsuddin Syamsuddin Syamsuddin Sylvia Florensy Bawias Ulayya Kasio Umma Fahriah Soleh Vitasari Vitasari Windi Windi Yana Silvia Mauru Yesy Febriyanti Yovita Yovita

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