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All Journal CAKRA KIMIA (Indonesian E-Journal of Applied Chemistry) Jurnal Kimia (Journal of Chemistry) JURNAL KIMIA SAINS DAN APLIKASI Jurnal Sains Materi Indonesia KOVALEN: Jurnal Riset Kimia Indonesia Chimica Acta Alotrop Jurnal Pendidikan dan Ilmu Kimia Dinamisia: Jurnal Pengabdian Kepada Masyarakat Jambura Journal of Chemistry RANDANG TANA - Jurnal Pengabdian Masyarakat Jurnal Farmamedika (Pharmamedica Journal) Jurnal Ilmu Kesehatan Jurnal Inovasi Teknik Kimia Jurnal Ilmiah Ibnu Sina (JIIS): Ilmu Farmasi dan Kesehatan Prosiding SIMKESNAS Jurnal Sains dan Kesehatan Jurnal Penelitian dan Pengabdian Masyarakat
Gusti Ayu Dewi Lestari
Program Studi S1 Farmasi, Sekolah Tinggi Farmasi Mahaganesha, Denpasar, Bali, Indonesia
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CHARACTERIZATION OF GOLD NANOPARTICLES FROM CLOVE FLOWER WATER EXTRACT AND ITS ANTIOXIDANT ACTIVITY Gusti Ayu Dewi Lestari; Kadek Duwi Cahyadi; Iryanti Eka Suprihatin
Jurnal Sains Materi Indonesia Vol 22, No 2: APRIL 2021
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/jsmi.2021.22.3.6292

Abstract

CHARACTERIZATION OF GOLD NANOPARTICLES FROM CLOVE FLOWER WATER EXTRACT AND ITS ANTIOXIDANT ACTIVITY. Green chemistry is a safe and cost effective method for producing metal nanoparticles, characterize and tested the antioxidant activity of gold nanoparticles (AuNPs). In this research gold nanoparticles were synthesized using HAuCl₄ as the gold precursor and water extract of Syzygium aromaticum (L.) flowers 0.5% as the bioreductor. Characterization of the gold nanoparticles was carried out using UV-Vis spectrophotometer to measure the maximum wavelength, zeta analyzer to determine the particle size, and SEM EDS to investigate the morphology and content of the gold nanoparticles. The antioxidant activity was determined by measuring its free radical scavenging activity using the DPPH method. The research found the AuNPs has a maximum wavelength at 533 nm, and particle size of 73.52 nm. Furthermore, the AuNPs show free radical scavenging activities of up to 70%.
EFEKTIVITAS NANOPARTIKEL PERAK (NPAg) UNTUK FOTODEGRADASI ZAT WARNA INDIGOSOL BLUE Gusti Ayu Dewi Lestari; Iryanti Eka Suprihatin; James Sibarani
CAKRA KIMIA (Indonesian E-Journal of Applied Chemistry) Vol 8 No 1 (2020): Volume 8, Nomor 1, 2020
Publisher : Magister Program of Applied Chemistry, Udayana University, Bali-INDONESIA

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Abstract

ABSTRAK: Biosintesis nanopartikel merupakan alternatif dari metode kimia dan fisika yang hemat biaya dan ramah lingkungan. Penelitian ini bertujuan untuk mengetahui efektivitas nanopartikel perak (NPAg) dalam mendegradasi zat warna Indigosol Blue. Nanopartikel perak disintesis menggunakan ekstrak air buah andaliman (zanthoxylum acanthopodium DC.). Ekstrak ini mempunyai fungsi sebagai agen pereduksi dan penstabil dari biosintesis nanopartikel perak. Ekstrak air buah andaliman ditambahkan ke larutan AgNO3 1 x10-3 M kemudian pembentukan NPAg diamati menggunakan spektrofotometer UV-Vis dengan puncak pada 442 nm. Ukuran partikel NPAg diamati menggunakan PSA (Particle size analyzer) dan diperoleh ukuran NPAg yang sangat kecil yaitu lebih kecil dari 40 nm. Efektivitas fotokatalitik NPAg terhadap Indigosol Blue sangat baik dimana NPAg mampu mendegradasi Indigosol Blue sampai konsentrasi 700 ppm. ABSTRACT: Biosynthesis of nanoparticle is an alternative to chemical and physical methods that are cost effective and environmentally friendly. This study aims to determine the effectiveness of NPAg to degrade Indigosol Blue dyes. The biosynthesis of silver nanoparticles has been carried out using andaliman fruit water extract (zanthoxylum acanthopodium DC.). This extract has a function as a reducing and stabilizing agent for the biosynthesis of silver nanoparticles. Andaliman fruit water extract was added to AgNO3 1 x10-3 M solution then NPAg formation was observed using a UV-Vis spectrophotometer with absorbance peak at 442 nm. NPAg particle sizes observed using particle size analyzer were less than 40 nm. The effectiveness of photocatalytic NPAg against Indigosol Blue is high where NPAg is able to degrade Indigosol Blue up to concentration of 700 ppm.
BIOSINTESIS NANOPARTIKEL PERAK MENGGUNAKAN EKSTRAK AIR DAUN CEMMEM (Spondias pinnata (L.f) Kurz.) DAN AKTIVITASNYA SEBBAI ANTIBAKTERI Gusti Ayu Putu Prima Purnamasari; Gusti Ayu Dewi Lestari; Kadek Duwi Cahyadi; Ni Ketut Esati; Iryanti Eka Suprihatin
CAKRA KIMIA (Indonesian E-Journal of Applied Chemistry) Vol 9 No 2 (2021): Cakra Kimia (Indonesian E-Journal of Applied Chemistry)
Publisher : Graduate Program of Applied Chemistry, Udayana University, Bali-INDONESIA

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Abstract

ABSTRAK: Nanopartikel perak (NPAg) dibuat dengan metode green synthesis dengan memanfaatkan bahan alam sebagai bioreduktor, seperti daun cemcem. Tujuan dari penelitian ini yaitu memanfaatkan ekstrak air daun cemcem (Spondias pinnata (L.f) Kurz.) sebagai bioreduktor untuk pembentukan nanopartikel perak dan menguji aktivitasnya sebagai antibakteri. Proses ini dimulai dengan mencampur ekstrak konsentrasi 0,5; 0,75; dan 1% dengan larutan 1 mM AgNO3 dengan perbandingan 1:10. Campuran dipanaskan dengan suhu 25; 40; dan 60°C. NPAg dikarakterisasi dengan spektrofotometer UV-Vis dimana hasil menunjukkan bahwa panjang gelombang NPAg antara 416 – 435 nm. Hasil PSA menunjukkan bahwa penggunaan ekstrak dengan konsentrasi 0,5% dengan suhu 60°C menghasilkan partikel dengan ukuran yang paling kecil yaitu sebesar 30,56 ± 0,24 nm. Pengujian antibakteri menunjukkan bahwa NPAg memiliki daya hambat yang tergolong sedang (6-10 mm). ABSTRACT: Silver nanoparticles (AgNPs) are made by green synthesis method by utilizing natural materials as bioreductants, such as cemcem leaves. The purpose of this study were to utilize the aqueous extract of the leaves of cemcem (Spondias pinnata (L.f) Kurz.) as a bioreductor for the formation of silver nanoparticles and to test its antibacterial activity. This process is started by mixing the extract concentration 0.5; 0.75; and 1% with 1 mM AgNO3 solution with a ratio of 1:10. The mixture was heated at temperature of 25; 40; and 60°C. AgNPs were characterized using a UV-Vis spectrophotometer where the results showed that the AgNPs wavelength was between 416 – 435 nm. The PSA results showed that the use of extracts with a concentration of 0.5% at a temperature of 60°C produced particles with the smallest size of 30.56 ± 0,24 nm. Antibacterial testing showed that AgNPs had moderate inhibitory power (6-10 mm).
KARAKTERISASI GREEN SYNTHESIS NANOPARTIKEL EMAS (NPAu) MENGGUNAKAN EKSTRAK AIR BIJI CENGKEH G. A. D. Lestari; K. D. Cahyadi; N. K. Esati; I. E. Suprihatin; B. Ankamwar
Jurnal Kimia (Journal of Chemistry) Vol. 16, No.1, Januari 2022
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JCHEM.2022.v16.i01.p16

Abstract

Metode baru untuk mensintesis nanopartikel emas yaitu metode green synthesis adalah metode yang sangat ramah lingkungan, murah, mudah dilakukan dan menggunakan pelarut yang aman bagi lingkungan. Aplikasi NPAu bagi kehidupan sangat luas seperti antioksidan, antibakteri, biosensor, antikanker dan lain-lain sehingga para ilmuwan berlomba untuk mencoba mensintesis NPAu. Penelitian ini bertujuan untuk mensintesis NPAu menggunakan prekursor HAuCl4 0,5 mM dan ekstrak air biji cengkeh 1%. Proses pembuatan NPAu ini dilakukan dengan mencampur larutan HAuCl4 dan ekstrak air biji cengkeh kemudian dipanaskan pada suhu 40?C dan 80?C. Karakterisasi NPAu dilakukan dengan beberapa metode yaitu spektrofotometer UV-Vis dimana didapat ?maks dari NPAu 540 nm (40?C) dan 542 nm (80?C), particle size analyzer menunjukkan ukuran partikel terkecil dari NPAu 116,8 nm dan hasil dari SEM EDS menunjukkan bentuk morfologi dari nanopartikel emas ini berupa kristal bulat dengan kandungan utamanya adalah emas murni. Kata kunci: biji cengkeh, green synthesis, karakterisasi, nanopartikel emas. A new method to synthesize gold nanoparticles, namely the green synthesis method, is a method that is environmentally friendly, inexpensive, easy to do and uses solvents that are safe for the environment. The application of AuNPs for life is very wide, such as antioxidants, antibacterials, biosensors, anticancer and others, so scientists are competing to try to synthesize AuNPs. This study aims to synthesize AuNPs using 0.5 mM HAuCl4 precursor and 1% water extract of clove seeds. The process of making AuNPs is carried out by mixing HAuCl4 solution and water extract of clove seeds then heating it at 40 ?C and 80 ?C. The characterization of AuNPs was carried out by several methods, namely UV-Vis spectrophotometer where the maximum wavelengths of AuNPs were 540 nm (40?C) and 542 nm (80?C), particle size analyzer showed that the smallest particle size of the AuNPs was 116.8 nm and the SEM EDS results showed that the morphological shape of the gold nanoparticles was in the form of sprerical crystals with the main content being pure gold. Keywords: characterization, clove seeds, gold nanoparticles, green synthesis.
Aplikasi Antibakteri Nanopartikel Perak (NPAg) Hasil Biosintesis dengan Ekstrak Air Daun Kemangi: Application of Antibacterial from Silver Nanoparticles (AgNPs) Biosynthesis with Basil Leaf Extract Gusti Ayu Dewi Lestari; Pande Made Desy Ratnasari; James Sibarani
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.i1.15771

Abstract

Nanotechnology is a technology that can be used to overcome several environmental problems. Synthesis of silver nanoparticles (AgNPs) mediated with basil leaf bioreductant with a concentration 0.5% at a temperature of 25⁰C has been carried out. The result of biosynthesis of AgNPs was analyzed using a UV-Vis spectrophotometer in which the SPR band showed the maximum wavelength of 429 nm. The size of AgNPs was determined by a Particle Size Analyzer (PSA), which its size was 86.83 nm. The morphology and elemental content of AgNPs were confirmed using SEM-EDS showing that the shape of AgNPs was irregularly spherical crystals while the EDS results showed a dominant peak at 3 keV indicating silver content. AgNPs showed strong antibacterial activity against Escherechia coli and moderate against Staphylococcus aureus.
STUDI EFEKTIVITAS REDUKSI KADAR FORMALIN PADA TAHU DENGAN PERENDAMAN AIR KUNYIT, AIR CUKA DAN AIR GARAM DALAM UPAYA PENYEDIAAN PANGAN AMAN Kadek Duwi Cahyadi; Agustina Nila Yuliawati; Gusti Ayu Dewi Lestari
Jurnal Ilmiah Ibnu Sina (JIIS): Ilmu Farmasi dan Kesehatan Vol 5 No 1 (2020): JIIS
Publisher : Sekolah Tinggi Ilmu Kesehatan ISFI Banjarmasin

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (166.403 KB) | DOI: 10.36387/jiis.v5i1.409

Abstract

Tofu is one type of food made from soybeans which is widely consumed and even favored by the people of Indonesia. Based on research conducted in Manado City Health Market in 2017, 92.86% of white tofu sold in the market positively contains formalin. The high content of formalin will poison the body, cause stomach irritation, allergies, are carcinogenic (causing cancer) and are mutagenic (causing changes in cell function). In this research, a simple way to reduce formalin levels in tofu will be developed, namely immersion with turmeric water, vinegar, and salt water in formalin tofu samples (simulated samples). Optimization will be carried out on the soaking time to get the most optimal conditions to reduce the levels of formalin in tofu. The simulation sample was treated with turmeric water, vinegar and salt water for 15, 30, and 60 minutes and then tested with fehling and tollens reagents. Quantitative tests were also performed using UV-VIS spectrophotometry using chromatrophic acid reagents. Qualitative test results showed a decrease in formalin levels after soaking with turmeric water, vinegar and salt water for 60 minutes. Quantitative test results, immersion of turmeric water, vinegar and salt water for 60 minutes showed a decrease in formalin concentrations by 22.56%, 25.54% and 55.33%.
ISOLASI DAN IDENTIFIKASI SENYAWA FLAVONOID FRAKSI ETIL ASETAT EKSTRAK DAUN AFRIKA (Vernonia amygdalina Del.) Ni Ketut Esati; I Putu Eka Budiarta; Kadek Duwi Cahyadi; Gusti Ayu Dewi Lestari
Jurnal Ilmiah Ibnu Sina (JIIS): Ilmu Farmasi dan Kesehatan Vol 6 No 2 (2021): JIIS
Publisher : Sekolah Tinggi Ilmu Kesehatan ISFI Banjarmasin

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (452.597 KB) | DOI: 10.36387/jiis.v6i2.741

Abstract

African leaves (Vernonia amygdalina Del.) are reported to have activity as anti-malarial, antibacterial, anticancer, antioxidant, and others. This is closely related to the secondary metabolite compounds, that are contained in african leaves. One of the secondary metabolites that have a big role in the efficacy of african leaves is flavonoids. So that the purpose of this study, to isolated and identified the flavonoid compounds from african leaves. The plants were picked directly in the Tabanan area, Bali. The stages of this study were making the ethanol extract of african leaves, skrinning of the secondary metabolite compounds from the ethanol extract of african leaves. After that, the isolation and purification of flavonoids in ethyl acetate fraction from extract of african leaves are doing. Then the isolate of flavonoid compounds are identified using Ultra Violet-Visible (UV-Vis) and Infrared (IR) spectrophotometer methods. From the results of this study, the yield of ethanol extract was 3.693% derived from maceration of African leaf simplicia powder using 96% ethanol as solvent. The results of phytochemical screening, African leaf ethanol extract contains alkaloids, flavonoids, phenolic compounds, steroids, and saponins. The results of the fractionation obtained n-hexane fraction as much as 2.57 grams, ethyl acetate fraction 0.53 grams, and water fraction as much as 3.02 grams. The flavonoid compounds in the ethyl acetate fraction were separated and isolated, resulting in 2 isolates which were further identified by UV-Vis and IR spectrophotometry. The results obtained with the addition of shear reagents that the ethyl acetate fraction contains flavonoids of the flavone group (7-hydroxyl free), and on examination by IR spectrophotometry showed the presence of OH groups, aliphatic CH, C=O, aromatic C=C, CO alcohol, and aromatic CH.
SKRINING FITOKIMIA DAN UJI AKTIVITAS ANTIOKSIDAN EKSTRAK ETANOL BUNGA ROSELLA UNGU (Hibiscus sabdariffa L.) Gusti Ayu Dewi Lestari
Jambura Journal of Chemistry Vol 4, No 1 (2022): February
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34312/jambchem.v4i1.11157

Abstract

Ekstrak etanol bunga rosella ungu (Hibiscus sabdariffa L.) mengandung senyawa fitokimia potensial sebagai antioksidan. Tujuan penelitian ini adalah untuk mengetahui kandungan senyawa pada bunga rosella ungu (Hibiscus sabdariffa L.) serta potensinya sebagai antioksidan. Bunga rosella ungu (Hibiscus sabdariffa L.) diekstraksi menggunakan metode maserasi dan diperoleh persentase rendemen hasil sebesar 35,25%. Skrining fitokimia dilakukan dengan metode KLT dimana ekstrak etanol bunga rosella ungu (Hibiscus sabdariffa L.) positif mengandung alkaloid, flavonoid, tanin dan saponin. Hasil uji aktivitas antioksidan dengan menggunakan DPPH (2,2-difenil-1-pikrilhidrazil) diperoleh nilai IC50 sebesar 38,2939 ppm dimana ekstrak etanol bunga rosella ungu (Hibiscus sabdariffa L.) memiliki aktivitas antioksidan sangat kuat. Nilai AAI (antioxidant activity index) diperoleh 1,04. Nilai presisi dan linearitas pada metode ini adalah 7,67% dan r2 = 0,9929 sehingga metode ini dapat dikatakan memiliki presisi dan linearitas yang baik. Dari hasil penelitian yang telah dilakukan, maka dapat disimpulkan bahwa bunga rosella ungu (Hibiscus sabdariffa L.) memiliki aktivitas antioksidan yang sangat kuat karena mengandung senyawa flavonoid, alkaloid, tanin dan saponin yang dapat menangkal radikal bebas.
PENYULUHAN DAN PELATIHAN PEMBUATAN SABUN PADAT ORGANIK DI DESA PEGUYANGAN DENPASAR Gusti Ayu Dewi Lestari
Dinamisia : Jurnal Pengabdian Kepada Masyarakat Vol. 5 No. 1 (2021): Dinamisia: Jurnal Pengabdian Kepada Masyarakat
Publisher : Universitas Lancang Kuning

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31849/dinamisia.v5i1.4645

Abstract

Teenagers in Peguyangan Kangin Village, Denpasar, Bali still do not understand the process of making organic solid soap because they have never received training on making organic solid soap. The aim of community service is to provide counseling and training in the manufacture of organic solid soap made from raw materials coconut oil, palm oil and olive oil. Pretest and posttest were carried out before and after the activity which is one form of evaluation of this activity. The result of the activity showed that counseling and training on making organic solid soap had provided information and knowledge to the youth of Peguyangan Kangin Village and could have been carried out well by the participants.
BIOSINTESIS NANOPARTIKEL EMAS MENGGUNAKAN EKSTRAK AIR BUAH ANDALIMAN (Zanthoxylum acanthopodium DC.) Gusti Ayu Dewi Lestari; Kadek Duwi Cahyadi; Ni Ketut Esati
CAKRA KIMIA (Indonesian E-Journal of Applied Chemistry) Vol 10 No 1 (2022): Cakra Kimia (Indonesian E-Journal of Applied Chemistry)
Publisher : Graduate Program of Applied Chemistry, Udayana University, Bali-INDONESIA

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Abstract

ABSTRAK: Sintesis hijau nanopartikel emas (NPAu) yang dimediasi ekstrak tumbuhan saat ini mendapatkan minat besar di bidang nanoteknologi. Dalam penelitian ini, NPAu disintesis menggunakan ekstrak air buah andaliman (Zanthoxylum acanthopodium DC.). Pembentukan NPAu dikonfirmasi dengan mengamati perubahan warna larutan dari bening menjadi cherry red. Parameter yang dioptimasi pada penelitian ini adalah konsentrasi ekstrak air buah andaliman dan rasio campuran ekstrak air buah andaliman dengan larutan HAuCl4. Nanopartikel emas dikarakterisasi menggunakan spektrofotometer UV-Vis, SEM-EDS dan PSA. Dari hasil karakterisasi, NPAu memiliki panjang gelombang maksimum 540-559 nm, morfologi NPAu berbentuk kristal bulat dimana komposisi tertinggi NPAu adalah emas sebesar 36,01% dan ukuran NPAu tersebut rata-rata di bawah 100 nm. ABSTRACT: Plant extract-mediated green synthesis of gold nanoparticles (AuNPs) is currently gaining great interest in the field of nanotechnology. In this study, AuNPs were synthesized using an aqueous extract of andaliman fruit (Zanthoxylum acanthopodium DC.). The formation of AuNPs was confirmed by observing the color change of the solution from clear to cherry red. The reaction parameters such as the concentration of andaliman fruit water extract and the ratio of the mixture of andaliman fruit water extract with HAuCl4 solution were optimized for AuNPs biosynthesis. Gold nanoparticles were characterized using UV-Vis spectroscopy, SEM-EDS and particle size analyzer. From the characterization results, AuNPs have a maximum wavelength of 540-559 nm, the morphology of AuNPs is spherical crystals where the highest composition of these AuNPs is gold at 36.01% and the size of these AuNPs is below 100 nm on average.
Co-Authors Abiansyah, Faisal Oktaviani Pratama Agustina Nila Yuliawati Andaresta, Ni Luh Putu Silvia Antariksa, Najwa Kusuma Putri B. Ankamwar Balqish Fathoum Medinna Dewi, Ni Putu Nita Lusiana Duwi Cahyadi, Kadek Elisabeth Oriana Jawa La Esati, Ni Ketut Gusti Ayu Putu Prima Purnamasari I Putu Eka Budiarta Intan Wahyuni, Pande Made Iryanti Eka Suprihatin Iryanti Eka Suprihatin James Sibarani James Sibarani Jessica Sanchez Anggraini K. D. Cahyadi Kadek Duwi Cahyadi Kadek Duwi Cahyadi Kadek Duwi Cahyadi Kadek Duwi Cahyadi Kunti Sri Panca Dewi, I Gusti Ayu Kusuma, Luh Adi Ngurah Wijaya Putra Ni Ketut Esati Ni Ketut Esati Ni Made Widayanti Ni Made Widayanti Ni Wayan Nieskajanti Kedeh Van Kempen Pande Made Desy Ratnasari Poa, Patricia Novica Dua Pramesti, Ni Komang Ayu Dyah Pratiwi, Ni Kadek Saskya Putu Dian Marani Kurnianta Ratnasari, Pande Made Desy Wati, Ni Ketut Sindia