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Equilibrium and Adsorption Kinetic Study of Metal Ni(II) using Persimmon Tannin Gel La O. Ahmad; Ulfa H. Syam; Laode A. Kadir; Nohong Nohong; Muh Natsir; Nasriadi Dali; Imran Imran; Tahril Tahril; Thamrin Azis
Jurnal Akademika Kimia Vol. 11 No. 2 (2022)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2022.v11.i2.pp111-116

Heavy metal concentration exceeding the threshold amount is hazardous to the environment, so it needs some treatment. The study aimed to know the capacity and kinetics of adsorption. This study used the adsorption method to remove the heavy metal ion Ni(II) using persimmon tannin gel. Influences of time contact, pH, and ion concentration in the adsorption process were also investigated. Results showed optimum adsorption at 60 minutes of time contact and pH 5. Variation of concentration made the adsorption decrease as metal ion Ni(II) concentration increased. The maximum adsorption capacity was 23.14 mg/g by using pseudo-second-order adsorption kinetic model.

Antifungal Activity Test of the Ethanol Extract of Kaembu-embu (Blumea balsamifera) Leaves Against the Fungus C. albicans Growth Nasriadi Dali Wela; Arniah Dali Wela; Seniwati Dali; Armadi Chairunnas; Hilda Ayu Melvi Amalia; Sri Ayu Andini Puspitasari
ALCHEMY:Journal of Chemistry Vol 10, No 2 (2022): ALCHEMY: Journal of Chemistry
Publisher : Department of Chemistry, Faculty of Science and Technology UIN Maulana Malik Ibrahim Malan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18860/al.v10i2.10954

AbstractResearch on the antifungal activity test of ethanol extract of Kaembu-embu (Blumea balsamifera) leaves against the fungus C. albicans growth was carried out. The aim of this study was to examine the antifungal activity of ethanol extracts of Kaembu-embu (Blumea balsamifera) leaves on the growth of the fungus C. albicans. The ethanol extract of Kaembu-embu (Blumea balsamifera) leaves was obtained through maceration method. The ethanol extract of Kaembu-embu (Blumea balsamifera) leaves was tested for antifungal activity by liquid and solid dilution methods in determining minimum inhibitory concentration (MIC) and minimum kill concentration (MKC). The results of the antifungal activity of the ethanol extract of Kaembu-embu (Blumea balsamifera) leaves on the growth of the fungus C. albicans by the liquid dilution method showed the MIC value of 25 ppm and MKC value of 500 ppm. While the results of the antifungal activity of the ethanol extract of Kaembu-embu (Blumea balsamifera) leaves on the growth of the fungus C. albicans by solid dilution method showed the MIC value of 5 ppm with inhibitory ability of 50.13% of media control and a MKC value of 250 ppm.

Pretreatment of Used Cooking Oil Using Avocado Seed Adsorbent for Biodiesel Production Preparation Nasriadi Dali; Seniwati Dali; Armadi Chairunnas; Hilda Ayu Melvi Amalia; Sri Ayu Andini Puspitasari
METANA Vol 19, No 1 (2023): Juni 2023
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/metana.v19i1.51797

Used cooking oil (UCO) can be used as raw material for biodiesel production, but its free fatty acid (FFA) content is still quite high, so it is necessary to do pretreatment in the form of an adsorption process to reduce FFA levels. This study aims to determine the optimum conditions for the adsorption process and determine FFA levels of UCO before and after pretreatment. The adsorbent used is avocado seed activated charcoal, because it has a surface area of 19.62 m2/g. The larger the surface area of the adsorbent material, the greater the adsorption capacity of the adsorbent. Optimization of the UCO adsorption process includes variations in adsorbent mass (6, 8, 10 g), adsorbent particle size (60, 100, 140 mesh), contact time (2, 6, 10 hours), and temperature (60, 80, 100oC). The results showed that the optimum conditions for adsorption of UCO were obtained at mass (10 g), particle size (100 mesh), contact time (6 h), and temperature (80oC). This condition can reduce the FFA content of UCO by 71.64% (w/w), from 5.29% (w/w) to 1.50% (w/w). The FFA content of UCO [1.50% (w/w)] produced after pretreatment was qualified as a raw material for the preparation of biodiesel production through the transesterification stage.

Synthesis of Ionophore from p-t-Butyl-(carboxymethoxy)calix[4]arene Substituted Amide Nasriadi Dali; Seniwati Dali; Armadi Chairunnas; Hilda Ayu Melvi Amalia; Sri Ayu Andini Puspitasari
Molekul Vol 18 No 1 (2023)
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.jm.2023.18.1.5927

The ionophore has been successfully synthesized from p-t-butyl(carboxymethoxy)calix[4]arene subtituted amide. The ionophore was obtained in two steps of the synthesis reaction. The first step is the chlorination reaction of p-t-butyl(carboxymethoxy)calix[4]arene with thionyl chloride in dry benzene solvent. The product of the chlorination reaction is p-t-butyl(chloroacetylmethoxy)calix[4]arene in the form of the light brown viscous liquid with the rendemen of 78.25% and TLC (SiO2, CH3OH : CH2Cl2 = 1 : 1 v/v, Rf = 0.65). The second step is the amidation reaction of p-t-butyl(chloroacetylmethoxy) calix[4]arene with dimethylamine in dry tetrahydrofuran solvent. The product of the amidation reaction is p-t-butyl(dimethylcarbamoylmethoxy)-calix[4]arene or the DIMECAC4ND3 ionophore in the form of white solid with the rendemen of 60.75%, a melting point of 277-279 °C, and TLC (SiO2, CH3OH : CH2Cl2 = 1 : 1 v/v, Rf = 0.82).

Biosynthesis of Methyl Esters from Used Cooking Oil (UCO) using Lipase Enzyme from Aspergillus oryzae on Moldy Copra Nasriadi Dali; Seniwati Dali; Armadi Chairunnas; Hilda Ayu Melvi Amalia; Ayu Andini Puspitasari
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 8, No 2 (2023): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jkpk.v8i2.67818

The successful production of methyl esters from used cooking oil (UCO) using lipase enzymes from Aspergillus oryzae on moldy copra has been achieved. This method offers an eco-friendly substitute for crude palm oil (CPO) in generating methyl esters or biodiesel, contributing to waste reduction, economic benefits, and lowered greenhouse gas emissions for sustainable development. This study aimed to synthesize methyl esters from UCO using the Aspergillus oryzae lipase enzyme sourced from moldy copra. The enzyme was purified through ammonium sulfate fractionation and gel filtration column chromatography. Electrophoresis validated its purity, and activity was assessed through the Erdmann and Lowry method. Methyl ester synthesis involved transesterification with a UCO (1 mol): methanol (9 mol): lipase enzyme (15% v/v) ratio. The enzyme displayed notable characteristics, including 43.76 units/mg protein activity, a 41.7 kDa molecular weight, optimum pH of 8.2, temperature preference of 35°C, Km of 0.046, and a 1.926 µmol/minute Vmax. This enzyme efficiently catalyzed UCO (triolein) into methyl ester (methyl oleate), yielding 75.65%. Characterization using Fourier Transform Infrared (FTIR) revealed specific functional groups like –OH carboxylic acid, C=C alkenes, C=O esters, methyl (CH3-), and methylene (-CH2-). Gas Chromatography-Mass Spectrometry (GC-MS) analysis identified prominent compounds: methyl palmitate (12.53%), methyl vacsenate (16.44%), and, notably, methyl oleate (41.08%). This underscores the potential of Aspergillus oryzae lipase as an effective biocatalyst for UCO transesterification, yielding valuable methyl esters or biodiesel.

Edukasi bagi Masyarakat Tanjung Tiram: Tanaman Obat Keluarga sebagai Upaya Meningkatkan Imunitas Prima Endang Susilowati; La Ode Ahmad; La Ode Kadidae; Nasriadi Dali; La Ode Abdul Kadir
Prosiding Seminar Nasional Pengabdian kepada Masyarakat (SINAPMAS) Perguruan Tinggi Mengabdi: Berkarya dan Berinovasi Untuk Membangun Masyarakat Semakin Tangguh di Mas
Publisher : Prosiding Seminar Nasional Pengabdian kepada Masyarakat (SINAPMAS)

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Desa Tanjung Tiram adalah salah satu desa di Kecamatan Moramo Utara Kabupaten Konawe Selatan, yang terletak tidak terlalu jauh dari kota Kendari (ibu kota Provinsi Sulawesi Tenggara). Pada masa pandemic Covid-19, kita harus meningkatkan sistem kekebalan tubuh yang merupakan kekuatan pertahanan tubuh melawan bakteri, virus dan organisme lain penyebab penyakit yang mungkin kita sentuh, hirup atau konsumsi. Meningkatkan daya tahan tubuh adalah salah satu kunci agar tidak tertular virus Covid-19. Masyarakat Desa Tanjung Tiram memiliki minat yang tinggi terhadap pemanfaatan tanaman obat tetapi memiliki pengetahuan yang minim mengenai tanaman yang dapat dimanfaatkan dan cara pengolahannya. Metode yang digunakan adalah sosialisasi melalui webinar serta penanaman TOGA di pekarangan rumah. Berdasarkan kondisi tersebut maka ditawarkan solusi melalui suatu program KKN Tematik Universitas Halu Oleo yang bertujuan untuk mengedukasi masyarakat mengenai tanaman yang dapat dimanfaatkan untuk meningkatkan imunitas tubuh dan mampu merealisasikan penanaman kebun TOGA dalam upaya pencegahan Covid-19. Kegiatan ini dilaksanakan selama 1 bulan yang terdiri dari 4 tahapan yaitu observasi awal, persiapan, pelaksanaan, dan evaluasi.Kata kunci— Covid-19, Edukasi, Imunitas, TOGA

Equilibrium and Adsorption Kinetic Study of Metal Ni(II) using Persimmon Tannin Gel La O. Ahmad; Ulfa H. Syam; Laode A. Kadir; Nohong Nohong; Muh Natsir; Nasriadi Dali; Imran Imran; Tahril Tahril; Thamrin Azis
Jurnal Akademika Kimia Vol. 11 No. 2 (2022)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2022.v11.i2.pp111-116

Heavy metal concentration exceeding the threshold amount is hazardous to the environment, so it needs some treatment. The study aimed to know the capacity and kinetics of adsorption. This study used the adsorption method to remove the heavy metal ion Ni(II) using persimmon tannin gel. Influences of time contact, pH, and ion concentration in the adsorption process were also investigated. Results showed optimum adsorption at 60 minutes of time contact and pH 5. Variation of concentration made the adsorption decrease as metal ion Ni(II) concentration increased. The maximum adsorption capacity was 23.14 mg/g by using pseudo-second-order adsorption kinetic model.

The Effect of Acidity Level (pH) and Palm Sugar Sucrose Levels on the Quality of Brown Sugar Dali, Nasriadi; Chairunnas, Armadi; Amalia, Hilda Ayu Melvi; Puspitasari, Sri Ayu Andini
METANA Vol 20, No 1 (2024): Juni 2024
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/metana.v20i1.57772

Research on the effect of acidity level (pH) and sucrose levels of palm sugar has been successfully carried out. This study aims to determine the effect of acidity level (pH) and sucrose levels of palm sugar on the quality of brown sugar produced. The level of acidity (pH) of palm sugar is set at pH (3, 4, 5, 6, and 7). The quality of brown sugar is divided into three categories, namely quality 1 (high), 2 (moderate), and 3 (low). The sucrose content of palm sugar at pH (3 – 7) was determined by the Luff Schoorl method. The quality of brown sugar was determined organoleptically. The results of determining the sucrose content of palm sugar by Luff Schoorl method at pH (3, 4, 5, 6, and 7) were respectively (11.30, 12.25, 14.17, 15.10 and 16.42%). The results of organoleptic determination of brown sugar quality showed that: (1) palm sugar with sucrose content of 11.30% (pH 3) and 12.25% (pH 4) produced low quality brown sugar; (2) palm sugar with sucrose content of 14.17% (pH 5) and 15.10% (pH 6) produced medium quality brown sugar; (3) palm sugar with a sucrose content of 16.42% (pH 7) produces high quality brown sugar. So, the level of acidity (pH) and sucrose levels of palm sugar affect the quality of brown sugar. The lower the pH and sucrose content of palm sugar, the lower the quality of the brown sugar produced. Conversely, the higher the pH and sucrose content of palm sugar, the higher the quality of the brown sugar produced. Therefore, the quality of palm sugar needs to be maintained so that the pH and sucrose content do not decrease so that the brown sugar produced is of high quality. The results of testing the quality of brown sugar based on SNI-01-3743-1995 show that brown sugar produced from palm sugar at pH 5 – 7 meets SNI requirements. Meanwhile, brown sugar produced from palm sugar at pH 3 and 4 does not meet SNI requirements.

Synthesis of Glucopyranosyl Acetic from Sago Flour as Raw Material for the Synthetic Polymers Dali, Arniah; Dali, Nasriadi; Dali, Seniwati; Amalia, Hilda Ayu Melvi
Indonesian Journal of Chemical Research Vol 8 No 3 (2021): Edition for January 2021
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2021.8-dal

Synthesis of glucopyranosyl acetic from sago flour as raw material for the synthetic polymers has been successfully carried out. The synthesis product is obtained through two reaction stages, namely the hydrolysis and esterification reactions. Sago flour is hydrolyzed with 25% HCl and neutralized with 45% NaOH. Glucose hydrolysis of sago starch and acetic anhydride was esterified using a zinc chloride catalyst. Synthesis product was obtained as a white solid substance (57.31% recovery), a melting point of 110 - 111oC, and Rf 0.79 on TLC (SiO2, n-hexane: ethyl acetate = 9:1 v/v). The results of the analysis of synthesis products with FTIR and GC-MS spectrometers showed that the synthesis product was glucopyranosyl acetic or 2,3,4,6-tetra-O-acetyl glucopyranose.

Extraction of The Chemical Components of Dengen Leaves (Dillenia serrata Thunb) by MAE Method and Activity Test as Antioxidant and Toxicity Wela, Nasriadi Dali; Dali, Seniwati; Chairunnas, Armadi; Amalia, Hilda Ayu Melvi; Puspitasari, Sri Ayu Andini
Indonesian Journal of Chemical Research Vol 10 No 2 (2022): Edition for September 2022
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598//ijcr.2022.10-wel

Research on the extraction of chemical components of Dengen (Dillenia serrata Thumb) leaves using the MAE (microwave-assisted extraction) method and activity as an antioxidant and toxicity test has been carried out. This study aimed to extract the chemical components of Dengen leaves using the MAE method and to test the antioxidant activity and toxicity of the ethanol extract of Dengen leaves. The chemical components of Dengen leaves were extracted by the MAE method and obtained ethanol extract with a yield of 47%. Dengen leaves ethanol extract was partitioned with n-hexane and ethanol as solvents and obtained yields of 5% (n-hexane) and 65% (ethanol). The chemical components of Dengen leave ethanol extract were identified by phytochemical screening. The results of phytochemical screening showed the presence of secondary metabolites of alkaloids, flavonoids, saponins, polyphenols, terpenoids, and steroids. The antioxidant activity test of the ethanol extract of Dengen leaves was carried out using the DPPH (2,2-diphenyl-1-picrihydrazil) method and obtained the value of IC50 = 100,363 ppm (strong antioxidant). A toxicity test of the ethanol extract of Dengen leaves was carried out using the BSLT (Brine Shrimp Lethality Test) method and obtained the value of LC50 = 18.3443 ppm (very toxic).

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