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All Journal Natural Science: Journal of Science and Technology Dharmakarya : Jurnal Aplikasi Ipteks Untuk Masyarakat KOVALEN: Jurnal Riset Kimia Indonesian Journal of Chemistry AR-RAZI Jurnal Ilmiah ULIN: Jurnal Hutan Tropis Jurnal Riset Sains dan Kimia Terapan al Kimiya : Jurnal Ilmu Kimia dan Terapan

Ahmad Ridhay

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

Author-ID : 360572

Agriculture, Biological Sciences & Forestry Arts Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Economics, Econometrics & Finance Engineering Environmental Science Languange, Linguistic, Communication & Media Public Health

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PRODUKSI METIL OLEAT MELALUI REAKSI METANOLISIS MINYAK BIJI KELOR (Moringa oleifera Lam) Fatiah Riskah; Ahmad Ridhay; Mappiratu Mappiratu; Erwin Abdul Rahim
KOVALEN: Jurnal Riset Kimia Vol. 5 No. 1 (2019): Edisi April
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Telah dilakukan penelitian yang bertujuan untuk mendapatkan fraksi massa metil ester asam oleat tertinggi dari rasio minyak biji kelor/metanol (v/v) serta waktu reaksi dalam proses metanolisis minyak biji kelor serta komposisi dari metil ester asam oleat. Penelitian ini dilakukan dengan menggunakan Rancangan Acak Lengkap (RAL) dengan variasi rasio minyak biji kelor/metanol 1:3, 1:4, 1:5, 1:6 dan 1:7 (v/v) serta variasi waktu reaksi 30 menit, 60 menit, 90 menit, 120 menit dan 150 menit. Hasil yang diperoleh menunjukkan bahwa peningkatan rasio minyak biji kelor/metanol meningkatkan fraksi massa metil ester asam oleat dengan fraksi massa maksimum (72.61%) terdapat pada penggunaan rasio minyak biji kelor/metanol 1:7 (v/v). Demikian pula pada pengaruh waktu reaksi yang menunjukkan bahwa peningkatan waktu reaksi meningkatkan fraksi massa metil ester asam oleat dengan fraksi massa maksimum (78.75%) terdapat pada penggunaan waktu reaksi 150 menit. Berdasarkan hasil analisis GC-MS diperoleh senyawa dominan penyusun metil ester tersebut adalah metil oleat persentase sebesar 48.25%, kemudian metil stearat dengan persentase sebesar 7.67%, selanjutnya metil palmitat dengan persentase sebesar 5.14 dan senyawa yang belum diketahui secara pasti dengan persentase sebesar 38.94%Kata Kunci: Minyak biji kelor, metil oleat,metanolisis

UJI STABILITAS PIGMEN EKSTRAK UBI BANGGAI (Dioscorea bulbifera var celebica Burkill) PADA BERBAGAI VARIASI pH DAN LAMA PAPARAN SINAR MATAHARI Bryan Agung Rundubelo; Ahmad Ridhay; Jaya Hardi; Dwi Juli Pusptasari
KOVALEN: Jurnal Riset Kimia Vol. 5 No. 1 (2019): Edisi April
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Penelitian tentang potensi ubi banggai (Dioscorea bulbifera var celebica Burkill) sebagai pewarna alami makanan dan minuman yang ditinjau dari stabilitas pH dan paparan sinar matahari telah dilaksanakan. Tujuan dari penelitian ini adalah mengetahui kestabilan ekstrak ubi banggai terhadap pengaruh pH dan terhadap paparan sinar matahari selama masa penyimpanan. Waktu yang digunakan adalah 10 hari untuk penyimpanan terhadap pengaruh pH dan 5 jam untuk paparan sinar matahari. Hasil penelitian menunjukan zat warna ekstrak ubi banggai stabil pada pH 2 setelah masa penyimpanan 10 hari dengan presentasi degradasi 37.38 % sementara pengaruh paparan sinar matahari menghasilkan degradasi terendah pada botol gelap yaitu 36,91 % dibandingkan dengan botol bening 41,96 %.Kata Kunci : Zat warna, stabilitas ubi banggai, degradasi

Retensi Antosianin dari Ekstrak Daun Bayam Merah (Alternanthera amoena Voss) pada Pengolahan Mie Basah: Retention of Anthocyanin from Red Spinach Leaves Extract (Alternanthera amoena Voss) in Processing Wet Noodles Betzy Eppang; Nurhaeni; Khairuddin; Ahmad Ridhay; Jusman
KOVALEN: Jurnal Riset Kimia Vol. 6 No. 1 (2020): 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.2020.v6.i1.14795

Research about the retention of red spinach leaves extract (Alternanthera amoena Voss) as a natural coloring and preservative in wet noodles has been done. The study aim is to determine the anthocyanin retention of red spinach leaves extract in the processing of wet noodles and determine the organoleptic quality of wet noodles by adding pigment red spinach leaves extract. The extraction method used the maceration method by ethanol solvent. Anthocyanin levels on an extract that obtained by using a UV-Vis spectrophotometer were 33.34%. Anthocyanin retention of red spinach leaves extract on wet noodle processing at storage times of 0, 6, 12, 18, 24, 30, 36, 42, and 48 hours was 100%, 75.87%, 75.37%, 74.95%, 74.62%, 74.12%, 73.28%, 71.70%, and 70.61%. Organoleptic quality of wet noodles that was added with extract has “like” to “really like” grade with score detail of the best color of 4.37 at 18 hours storage, whereas the odor, texture, and taste for 0 hours storage have the highest score of 4.63, 4.63, and 4.57, respectively. The wet noodles with red spinach leaves extract more preferred than the noodles without extracts. Keywords: Retention, anthocyanin, Alternanthera amoena Voss., wet noodles

Viskositas dan Aktivitas Antibakteri Sabun Cair Berbasis VCO dengan Penambahan Ekstrak Etanol Daun Kelor (Moringa oleifera) Terhadap Bakteri Patogen: Viscosity and Antibacterial Activity of VCO-Based Liquid Soap with Addition of Ethanol Extract of Moringa Leaf (Moringa oleifera) Against Pathogenic Bacteria Pasjan Satrimafitrah; Mohamad Afdal; Jusman; Abd. Rahman Razak; Ahmad Ridhay; Nov Irmawati Inda
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.i1.15846

This research was conducted by making VCO-based liquid soap with the addition of ethanol extract from Moringa leaves (Moringa oleifera). The purpose of this research was to determine the mass ratio of ethanol extracts of Moringa leaves and Virgin Coconut Oil (VCO) which produces soap with the highest antibacterial activity against tested bacteria. The other purpose is to determine the effect of the mass ratio against the viscosity of liquid soap. The research design used was a Completely Randomized Design (CRD) with the independent variables being the mass ratio of Moringa leaf ethanol extract and VCO which consists of five levels of 0:75 (F1), 1.5:73.5 (F2), 3:72(F3), and 4.5:70.5(F4) (w/w). The soap produced was tested for antibacterial activity againts Staphylococcus aureus, Escherichia coli, and Staphylococcus epidermidis using agar diffusion method as well as viscosity tests. The results showed that the antibacterial activity of liquid soap tends to be higher with increasing levels of ethanol extract of Moringa leaves. The liquid soap formula with the ratio of Moringa leaf ethanol extract: VCO of 3:72 (w/w) (Formula F3) had relatively higher antibacterial activity against the three tested bacteria. The inhibition zones against Staphylococcus aureus, Escherichia coli, and Staphylococcus epidermidis were 22.302 mm, 33.230 mm, and 36.490 mm, respectively, while the viscosity value of liquid soap was 47.433 cP.

A STIGMASTEROL GLYCOSIDE FROM THE ROOT WOOD OF Melochia Umbellata (Houtt) Stapf var. degrabrata K. Ahmad Ridhay; Alfian Noor; Nunuk H. Soekamto; Tjodi Harlim; Ian van Altena
Indonesian Journal of Chemistry Vol 12, No 1 (2012)
Publisher : Universitas Gadjah Mada

A stigmasterol glycoside (stigmast-5,22-dien-3-O-β-D-glucopyranoside) has been isolated from the chloroform fraction of root wood of Melochia umbellata (Houtt) Stapf var. degrabrata K. The compound structure was determined on spectroscopic evidences including IR, 1D and 2D NMR and compared to previous data. The isolate was also active against Aspergillus niger.

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.

PEMBUATAN MINUMAN ISOTONIK DAN SUSU COKLAT SEBAGAI OLAHAN BUAH KELAPA DI DESA BALE KECAMATAN TANANTOVEA Jaya Hardi, Ruslan, Abd. Rahman Razak dan Ahmad Ridhay Jaya Hardi; Ruslan Ruslan; Abd. Rahman Razak; Ahmad Ridhay
Dharmakarya : Jurnal Aplikasi Ipteks Untuk Masyarakat Vol 11, No 2 (2022): Juni. 2022
Publisher : Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/dharmakarya.v11i2.36590

Desa Bale merupakan salah satu daerah yang terletak di Kabupaten Donggala, Sulawesi Tengah. Penduduk di Desa Bale umumnya sebagai petani kelapa. Pembuatan produk olahan kelapa yang inovatif masih sangat kurang di Desa Bale. Minuman isotonik dan susu coklat santan kelapa dapat menjadi produk olahan baru bagi masyarakat setempat. Tujuan kegiatan ini adalah untuk menambah keterampilan masyarakat di desa Bale dalam mengolah air kelapa tua dan santan kelapa menjadi produk yang menarik dan memiliki nilai jual yang menjanjikan. Metode yang digunakan pada kegiatan ini adalah penyuluhan yang diikuti dengan demonstrasi. Hasil dari kegiatan yang dilakukan adalah keterampilan masyarakat mitra di desa Bale bertambah dalam membuat minuman isotonik dan susu coklat santan kelapa dengan menggunakan metode yang sederhana dan murah. Hasil pengukuran tingkat kepuasan menunjukkan bahwa 80% peserta atau mitra sangat puas terhadap pelaksanaan kegiatan pengabdian. Masyarakat mitra siap untuk mengembangkan produk olahan hasil pelatihan dalam bentuk produk yang siap dipasarkan.

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.

PENGARUH WAKTU INKUBASI PADA PEMBUATAN VIRGIN COCOCONUT OIL (VCO) MENGGUNAKAN ENZIM BROMELIN TERIMOBILISASI ALGINAT Jaya Hardi; Ahmad Ridhay; Isabella de Nadra
Jurnal Ilmiah Ar-Razi Vol 11, No 1 (2023): Jurnal Ilmiah Ar-razi
Publisher : Universitas Muhammadiyah Pontianak

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29406/ar-r.v11i1.5233

Enzim bromelin memiliki aktivitas proteolitik yang dapat dimanfaatkan padapembuatan Virgin Coconut Oil (VCO). Stabilitas bromelin dapat ditingkatkan denganmenggunakan teknik imobilisasi. Bromelin terimobilisasi alginat dapat digunakan secaraberulang sehingga sangat efektif dan efisien pada pembuatan VCO. Tujuan penelitianyang dilakukan adalah untuk mendapatkan waktu inkubasi terbaik pada produksi VCOmemanfaatkan bromelin dari bonggol nanas terimobilisasi alginat. Imobilisasi bromelinmenggunakan metode entrapment dan pembuatan VCO dilakukan secara enzimatispada suhu ruang dengan variasi waktu inkubasi 24, 36, 48 dan 60 jam. Rendemen VCOtertinggi adalah 36,8% pada waktu inkubasi 48 jam. Kadar asam lemak bebas dan kadarair produk VCO yang diperoleh masih lebih tinggi dari 0,2% atau melebihi batasmaksimum yang dipersyaratkan SNI 7381:2008, tetapi bilangan peroksida VCO telahmemenuhi SNI, yaitu maksimum 2 mg ek/kg. Pembuatan VCO secara enzimatik dapatmenggunakan bromelin terimobilisasi alginat dengan waktu inkubasi optimum 48 jamyang perlu dilanjutkan dengan pemurnian VCO.

Analisis Kadar Kadmium (Cd) dalam Bawang Merah Lokal Palu (Allium cepa L. var. aggregatum) pada Berbagai Lokasi dan Umur Tanam: Analysis of Cadmium (Cd) in Palu Local Shallots (Allium cepa L. var. aggregatum) at Various Locations and Planting Ages Eka Lindawati; Khairuddin Khairuddin; Nurhaeni; Ruslan; Ahmad Ridhay; Husain Sosidi; Erwin Abdul Rahim; Syamsuddin
KOVALEN: Jurnal Riset Kimia Vol. 9 No. 1 (2023): 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.2023.v9.i1.16287

The local Palu shallot (Allium cepa L. var. aggregatum) plant is one of the leading products in the Central Sulawesi region. Shallots can experience a decrease in quality if they are contaminated with heavy metals, such as cadmium (Cd) in amounts that exceed the threshold. This study aims to determine the effect of planting age on cadmium levels in local Palu shallots cultivated in Oloboju Village and Solove Village, Biromaru District, Sigi Regency. The research variables used were the planting age which consisted of 4 levels (age 40, 50, 60, and 70 days), and the planting location which consisted of 2 levels (Solove Village and Oloboju Village). Cd levels were analyzed using an Atomic Absorption Spectrophotometer (AAS). Cadmium levels in shallot roots at two planting locations decreased with increasing planting age, from 101.34 - 107.18 mg/kg at 40 days of age to 1.68-3.78 mg/kg at 70 days of age. Shallot bulbs at two locations had lower cadmium levels than roots, namely 0.01-0.04 mg/kg. The results of the study found that planting time had a significant effect on cadmium levels in the roots of shallots, but planting age and planting location had no significant effect on cadmium levels in local Palu shallot bulbs with levels that met the SNI (Indonesian national standard) quality requirements

Co-Authors Abd. Rahman Razak Abd. Rahman Razak Abd. Rahman Razak Abustiana, Rahma Lolita Agriyani Marcelinda, Agriyani Aini Auliana Amar Aini Hoiriyah, Aini Alfian Noor Asniawati Asniawati Betzy Eppang Bryan Agung Rundubelo Darwin Darwin Debi Christa Ondagau Deddy Firman Didit Purwanto Djumidar Dwi Juli Puspitasari Dwi Juli Pusptasari Eka Lindawati Erwin Abdul Rahim Erwin Erwin Fatiah Riskah Fitrianingsih Mozin Gilang Almilda Hardi Ys Hardi Ys Husain Sosidi I Nyoman Adi Putra Ian van Altena Inda Hastuti N Naser Indriani Indriani Indriani Indriani Indriani Indriani Isabella de Nadra Ivitri Susana Jaya Hardi Jusman Jusman, Jusman Khairuddin Khairuddin Khairuddin Kurniawati Kurniawati Magfira Magfira Mappiratu Mappiratu Mappiratu Mappiratu Marsela, Anggi Mirzan, Muhamad Moh. Mirzan Moh. Mirzan Mohamad Afdal Musafira Musafira Musdalifah Musdalifah Ni Ketut Sumarni Ni Luh Sumitriasih Nov Irmawati Inda Nunuk H. Soekamto Nur Faidah Nur Istiqomah Nur Madinah Rizal Nur'ain Nur'ain Nurakhirawati Nurakhirawati Nurakhirawati Nurhaen, Nurhaen Nurhaeni Nurhaeni Nurhaeni Nurhaeni Nurhaeni Nurhaeni Nurhaeni Nurhaeni Nurhalisa, Sitti Nurmila Nurmila Nurul Bima Khasanah NURUL CHOLIFAH Oktavian Mangela Parwati Parwati Pasjan Satrimafitrah Patrisia Marcevin Rengku Pratiwi Listyana Sareu Prismawiryanti Prismawiryanti Rahma Wati Rahmadani, Indah Ashari Ripdayana Ripdayana Riski, Mutiara Zalfa Ruslan Ruslan Ruslan Ruslan Sabarwati, Sitti Hadijah Siti Helmyati Sitti Nur Halizah Syaiful Bahri Syaiful Bahri Syaiful Bahri Syamsuddin Syamsuddin Tjodi Harlim Ulayya Kasio Vivi Sasmita Winarsii, Dessy

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