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All Journal Natural Science: Journal of Science and Technology Jurnal Ilmu Lingkungan bionature Prosiding Seminar Biologi PROSIDING SEMINAR KIMIA Journal of Tropical Biodiversity and Biotechnology Jurnal Dinamika Pengabdian (JDP) Indonesia Chimica Acta Emerging Science Journal Indonesian Journal of Chemistry Indonesian Journal of Pure and Applied Chemistry Communications in Science and Technology Jurnal Ilmu Alam dan Lingkungan SELAPARANG: Jurnal Pengabdian Masyarakat Berkemajuan Chemistry Indonesian Journal of Chemical Research Scripta Biologica Fullerene Journal of Chemistry Indobiosains Molekul: Jurnal Ilmiah Kimia
Ahyar Ahmad
Universitas Hasanuddin
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Engineering Environmental Science Health Professions Immunology & microbiology Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Medicine & Pharmacology Nursing Public Health Social Sciences Veterinary Other

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Sintesis Selulosa Suksinat Melalui Reaksi Esterifikasi Asam Suksinat Miftahul Jannah; Ahyar Ahmad; Paulina Taba; Harningsih Karim
Jurnal Kimia Fullerene Vol 8 No 1 (2023): 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.v8i1.499

Abstract

Cellulose is a biopolymer that is widely applied in various fields. Modification of cellulose is needed to increase the added value of cellulose. One of these cellulose derivatives is cellulose succinate. This study aims to synthesize succinic cellulose using succinic acid. This research covers the synthesis of cellulose succinate via esterification reaction with a variation of succinic acid (1.6%; 2.4%; 3.2% and 4.0%), DS determination by titration method, and characterization with FTIR. Based on the synthesis results, the optimum DS was obtained at 2.4% succinic acid (SS3) concentration, namely 0.692. The results of the characterization with FTIR also showed the presence of a C=O absorption band indicating the presence of cellulose succinate monoester.
Production, Characterization, and Toxicity Test of L-asparaginase from Vibrio alginolyticus Bacterial Symbiont of Green Algae Caulerpa lentillifera Kasturiasih, Ni Putu; Ahmad, Ahyar; Arfah, Rugaiyah A.; Khairunnur, Siti; Soekamto, Nunuk Hariani; Taba, Paulina; Hala, Yusafir; Karim, Harningsih
Molekul Vol 18 No 3 (2023)
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.jm.2023.18.3.8153

Abstract

L-asparaginase is an enzyme that can be used as an anticancer therapeutic agent. This study aimed to optimize fermentation time for production, optimization, and to test the toxicity of L-asparaginase from Vibrio alginolyticus (V. alginolyticus) bacterial symbiont of green algae Caulerpa lentillifera (C. lentillifera). The activity of L-asparaginase enzyme assay and the toxicity test were done by using the Nessler method and the Brine Shrimp Lethality Test (BSLT) method respectively. The results show L-asparaginase with 66 hours of fermentation time indicates the highest enzyme activity. L-asparaginase mentioned has an optimum enzyme activity of 17.99 U/mL for 30 minutes of incubation time at 37 °C, and pH 7.5. The BSLT results show LC50 value of 17.83 μg/mL indicating the enzyme is bio-toxic with high-level toxicity, which can continue for cytotoxicity tests on cancer cells.
Chitinase Enzyme-Producing Endophytic Bacterias From the Roots of the Plant Gembolo (Dioscorea bulbifera): Isolation, Characterization and its Potential as an Antifungal Agent Yunita, Vivi Alfi; Natsir, Hasnah; Ahmad, Ahyar; Baharuddin, Maswati
Molekul Vol 19 No 1 (2024)
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.jm.2024.19.1.9422

Abstract

Chitinase is an enzyme of the chitinolytic group that has many roles in agriculture, especially as an antifungal, because chitin is one of the constituent components of the fungal cell wall. This study aimed to isolate and identify endophytic bacteria from gembolo (Dioscorea bulbifera) roots and to characterize the chitinase enzyme from these endophytic bacteria to be used as an antifungal. Isolation and identification of gembolo plant root endophytic bacteria using PCR method of 16S rRNA gene amplification and sequencing. Characterization of the chitinase enzyme produced includes determining of optimum pH, temperature, and substrate UV-Vis spectrophotometer. Antagonistic test of the chitinase enzyme and endophytic bacterial isolates (isolate K4) Fusarium oxysporum. The results showed that bacterial isolate K4 had with chitinolytic index of 2.45 mm. Electrophoresis results with PCR 16s rRNA gene; the length of the amplified fragment is the position of 1300 bp. By doing the BLAST process in GenBank, the bacterial isolate has 97.93% similarity with Enterobacter cloacae. Then, this endophytic bacteria is called Enterobacter cloacae K4-G. This bacterium produced chitinase enzyme reaching maximum chitinase activity at the 38 hours with an activity of 0.0312 U/mL. The chitinase characterization results of E. cloacae K4-G showed that the optimum conditions were reached at at pH 6, temperature 45 ᵒC, and 2.5% substrate with a chitinase activity value of 0.2467 U/mL. Chitinase enzyme and bacteria Enterobacter cloacae K4-G can inhibit the growth of the fungus Fusarium oxysporum. Therefore, Chitinase from Enterobacter cloacae K4-G can be used as an antifungal pathogen in plants.
Bioactivity and Metabolites Compounds of Medicinal Plants Endophytic Fungi in Indonesia Sukmawaty, Eka; Karim, Abdul; dwyana, Zarsawaty; Natsir, Hasnah; Karim, Harningsih; Ahmad, Ahyar
Journal of Tropical Biodiversity and Biotechnology Vol 9, No 2 (2024): June
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jtbb.79070

Abstract

Indonesia is rich in diversity of medicinal plants, vital in traditional medicine and the pharmaceutical industry. However, overharvesting, along with population growth, land use changes, deforestation, and climate change, endanger these plants. This review investigates the potential of endophytic endosymbiont as an alternative. These endosymbionts can synthesise bioactive compounds similar to those found in medicinal plants.  This study compiled data from various sources on endophytic fungi and their bioactivity. The review aims to categorise Indonesian medicinal plants, to identify their associated endophytic fungi from different plant parts, and to assess their bioactivity. The results revealed numerous medicinal plant families and a variety of endophytic fungi isolated from fruits, leaves, twigs, bark, roots, and rhizomes. These fungi exhibited bioactivities, including antioxidant, anticancer, antidiabetic, and antimicrobial effects, with metabolites such as alkaloids, flavonoids, peptides, phenols, polyketides, quinones, steroids, and terpenoids. Fusarium and Colletotrichum were the most common endophytic fungi found. Notably, the biological activity was consistent among endophytic fungi from various host organs, but variations were observed according to the host's geographical origin. This suggests that Indonesia's diverse geography influences metabolite production and activity. However, the same host plant may harbour different species in distinct organs. These findings indicate that endophytic fungi within medicinal plants represent a promising source of bioactive compounds for future Indonesian medicine production. Future research should explore metabolite compounds and bioactivity across different geographical regions. 
Oleanan Derivate Compounds From Melochia umbellata (Houtt) Stapf var. Degrabrata K Bark And Their Bioactivity Usman, Usman; Soekamto, Nunuk H.; Usman, Hanapi; Ahmad, Ahyar
Indonesian Journal of Chemical Research Vol 2 No 1 (2014): 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.2014.2-usm

Abstract

Oleanan derivated 3-acetyl-12-oleanen-28-oat has been isolated from the n-hexane fraction of M. umbellata(Houtt) Stapf var. degrabrata K. bark. The molecular structure were determined by IR spectroscopy, 1D and 2DNMR (1H, 13C, DEPT, COSY, HMQC and HMBC) data analysis. Bioactivity tested results indicated that thecompound was toxic to A. salina with LC50 value was 361.93 mg/mL. At the concentration of 1000 mg/mL 3acetyl-12-oleanen-28-oat gave the highest inhibition to bacteria B. subtilis and the fungus C. albicans with the inhibited zone diameter was 15.8 mm and 15.2 mm, res.
Potensi Ekstrak Metanol Kulit Batang Lannea coromandelica (Houtt.) Merr. Terhadap Staphylococcus aureus Dan Analisis Metabolit Sekunder Utamanyanya Syamsurya, Syamsurya; Ahmad, Ahyar; Firdaus, Firdaus
Indonesian Journal of Chemical Research Vol 4 No 1 (2016): 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.2016.4-sya

Abstract

This study aims to determine the potential of the methanol extract of the stem bark Lannea coromandelica (Houtt.) Merr. against Staphylococcus aureus and to analyze the main secondary metabolites. Staphylococcus aureus antibacterial activity test was performed by Mueller-Hinton agar medium whereas the secondary metabolite analysis of the methanol extract of the stem bark is conducted by GC-MS instrument. Results of research the methanol extract of bark Lannea coromandelica (Houtt.) Merr showed antibacterial activity against Staphylococcus aureus with inhibition zone diameter each at a concentration of 2.5% by 7.3 mm by 8.6 mm 5% and 10% of 10.4 mm. Selanjunya result of analysis by using GC-MS showed the presence of compounds 5-hidroksimetilfurfural and compounds 1, 2, 3-benzenetriol potential as an antibacterial Staphylococcus aureus. Furthermore, the results of analysis by GC-MS instrumeny showed the presence of compounds 5-hidroksimetilfurfural and compounds 1, 2, 3-benzenetriol potential as an antibacterial Staphylococcus aureus.
Synthesis of cellulose acetate (CA) from algae Gracilaria sp. composited with nickel oxide (NiO) as a supercapacitor base material Risdianto, I Wayan; Ahmad, Ahyar; Ermawar, Riksfardini Annisa
Communications in Science and Technology Vol 8 No 1 (2023)
Publisher : Komunitas Ilmuwan dan Profesional Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21924/cst.8.1.2023.1176

Abstract

In this research, electrodes were made from cellulose acetate (CA) synthesized from algae Gracilaria sp. and then composited with nickel oxide (NiO), the concentration of which varied from 0, 0.2, 0.4, and 0.6 grams. Furthermore, FT-IR characterized cellulose acetate, and the CA-NiOn electrode was characterized by XRD, SEM, and cyclic voltammetry (CV). The results showed that CA was successfully synthesized from Gracilaria sp. Increasing the concentration of NiO added to CA as an electrode could increase the specific capacity, energy density, and power density of the electrode with the highest degree of 83.27 F/g, energy density of 4 Wh/kg, and a power density of 0.4 W/kg at a concentration of 0.6 gram NiO. The effect of the addition of NiO on the characteristics of the CA-NiOn electrode was also studied such as crystallinity, crystal size, and porosity. The presentation of CA doped with NiO has the promising prospects as a supercapacitor base material.
Synthesis and Characterization of Nickel Nanoparticles: Biological and Photocatalytic Properties Fadliah, Fadliah; Raya, Indah; Ahmad, Ahyar; Taba, Paulina; Burhanuddinnur, Muhammad; Gaffar, Maming; Putri, Tri Widayati; Nur, Arfiani; Abubakar, Andi Nur Fitriani; Munadi, Rachmin; Majid, Ahmad Fudhail; Pratama, Irham; Yasser, M.; Jarre, Sulistiani; Karim, Harningsih
Indonesian Journal of Chemistry Vol 25, No 1 (2025)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.90034

Abstract

The potential uses of ecologically benign nickel nanoparticle manufacturing in various sectors, such as biomedicine, energy storage, and catalysis, have garnered much interest. This paper covers green approaches to nickel nanoparticle manufacturing, which integrate natural substances as stabilizing and reducing agents with eco-friendly processes. Phytochemicals derived from bacteria, microorganisms, and plant leaf extracts can convert nickel ions (Ni2+) into nickel nanoparticles. Room temperature is used for the synthesis procedure, and neither dangerous compounds nor unusual reaction conditions are used. Using a variety of analytical methods, the resultant nickel nanoparticles were characterized. We also investigate the possibility of using the generated nickel nanoparticles as a cytotoxic, photocatalytic, antioxidant, and antibacterial agents. The antimicrobial activity of nickel nanoparticles demonstrates their potent antibacterial properties, while their antioxidant activity demonstrates their capacity to combat free radicals effectively. Furthermore, nickel nanoparticles' cytotoxic activity demonstrates their capacity to kill cancer cells, and their photocatalytic activity demonstrates their efficiency in breaking down organic contaminants. This review highlights the value of ecologically benign synthetic methods and creates new avenues for developing nickel nanoparticle applications in health and the environment.
A Review of Marine Bacterial Intracellular and Extracellular Bioactive Compounds as Novel Antibacterial and Anti-Inflammation Agents Karim, Harningsih; Azis, Arief; Ramadani, Ananda; Anita, Anita; Ahmad, Ahyar; Natsir, Hasnah; Taba, Paulina; Putri, Suriati Eka; Sarlan, Sarlan; Larekeng, Siti Halimah; Irfandi, Rizal
Indonesian Journal of Chemistry Vol 25, No 1 (2025)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.90039

Abstract

Unique and varied bioactive compounds produced by the ocean have drawn attention and served as a focus for creating antibacterial and anti-inflammatory agents. As part of the approach for locating these research sources, databases such as PubMed, Science Direct, MDPI, Google Scholar, Springer Link, Web of Science, Scopus, and Wiley Online Library were used to identify completed studies. Numerous intriguing bioactive compounds have so far been isolated from marine bacteria. A crucial resource in the ongoing search for novel peptides, proteins, lipids, nucleosides, enzymes, alkaloids, polyketides, and terpenoids is the diversity of marine bacterium strains. This review summarizes several bacterial intracellular and extracellular bioactive compounds that have been applied as antibacterial and anti-inflammatory agents in 2016–2024, which we present in the form of structures, species sources, and evaluations of these compounds' antibacterial and anti-inflammatory activities. Therefore, this review article can be used as a recommendation for utilizing biomaterials from marine bacteria that are promising in the future for industrial-scale production of antibacterial and anti-inflammatory agents.
The Utilization of Gracilaria sp. as Raw Material for Cellulose in Cellulose Acetate-Nickel Oxide (CA-NiO) as Electrode for Energy Storage Technology Karim, Abdul; Ahmad, Ahyar; Arfah, Rugaiyah Andi; Ermawar, Riksfardini Annisa; Karim, Harningsih; Putra, Andi Erwin Eka; Putri, Suriati Eka; Negara, Satria Putra Jaya; Larekeng, Siti Halimah
Indonesian Journal of Chemistry Vol 25, No 1 (2025)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.96533

Abstract

In the modern era, electrical energy has become a significant need that drives the large consumption of fossil fuels and their environmental impacts. Supercapacitors can reduce this large consumption of natural polymers such as cellulose acetate (CA), which can be synthesized from Gracilaria sp. Composites with CA can be an environmentally friendly alternative electrode with low toxicity. The results show that the cellulose has been successfully synthesized from the algae Gracilaria sp., which was proven by FTIR spectra analysis. The results also show that supercapacitor electrodes have been successfully made where the manufactured electrodes form a composite between CA and nickel oxide (NiO), with the highest specific capacitance and specific energy values of 15.5 × 102 F/g and 13.3 × 102 Wh/kg, respectively, on the CA-NiO2 electrode, but when the NiO concentration is higher than the CA concentration the specific capacitance and specific energy decrease as shown on the CA-NiO electrode with NiO mass of 0.6 g. Thus, the materials results of this study can be applied to electric vehicles and technology that requires electricity storage in the future.
Co-Authors Abdul Karim Abdul Rauf Patong Abubakar, Andi Nur Fitriani Ade Rifka Junita Adriana, Risda Ahmad Fudhail  Majid Ajuk Sapar Alfian Noor Ali Muhakim Andi Erwin Eka Putra Andi Evi Erviani Anita Anita Anita Anita Ardita R, Dian Fitrah Arfah, Rugaiyah Arfah, Rugaiyah A. Arfah, Rugaiyah Andi Arfiani Nur Arif, Ainun Rezkiva Aslinda, Wery Asmuddin Nasir Asmuddin Natsir Azis, Fitria Baharuddin Patandjengi Brugman, Irene BUDI SAKSONO Burhanuddin Bahar Burhanuddinnur, Muhammad Cut Muthiadin Deni Zulfiana Djabal Nur Basir dwyana, Zarsawaty Ermawar, Riksfardini A. Eva Johannes Fadliah, Fadliah Febryanti, Amalyah Firdaus Firdaus Firdaus Hamid Fitria Aziz Gita Gita Hafsan, Hafsan Hanapi Usman Harningsih Karim Harningsih Karim Hasnah Natsir Hasnah Natsir Herlina Rasyid Husnul Khotimah Indah Raya Indah Raya Irfandi, Rizal Irmawati Isna Rasdianah Aziz Kasturiasih, Ni Putu Khairunnur, Siti Laily Agustina Laily Agustina, Laily M. Sabir Maming Gaffar, Maming Mashuri Masri Maslan, Muhammad Maswati Baharuddin Miftahul Jannah Mochammad Hatta Muh. Nur Alam Muh. Yusri Karim Muhammad Nadir Muhammad Reza Primaguna Muhammad Zakir Muhammad Zakir Munadi, Rachmin Negara, Satria Putra Jaya Nunuk H. Soekamto Nunuk Hariani Soekamto Nur Asmi Nur Indah Purnamasari Nur Umriani Nurfadini, Nurfadini Nurhikmah Nurhikmah Nurjannah Nurjannah Nurmujahidin, Nurmujahidin NURUL ANNISA Paulina Taba Putri, Alifiah Alfaniah Alfattah Putri, Tri Widayati Ramadani, Ananda Ramli, Siti R. Rasyid, Herlina Ressy Dwiyanti Ridwan, Irham Pratama Riksfardini Annisa ERMAWAR Risdianto, I Wayan Riska Mardiyanti Rosdiana Natzir Rugaiyah A. Arfah Sappewali, Sappewali Sarlan, Sarlan Sita Heris Anita SITI HALIMAH LAREKENG, SITI HALIMAH Sri Wahyuni St. Fauziah Sukmawaty, Eka Sulistiani Jarre Suriati Eka Putri Syamsurya, Syamsurya Tutik Kuswinanti USMAN - Usman Usman Wahyudin Rauf Wahyuni, Ilmi Yasser, M Yuniar Harviyanti Yunita, Vivi Alfi Yusafir Hala Zainuddin, Rahmaniah