Article Per Year (5 Year)
p-Index From 2021 - 2026
3.486
P-Index
This Author published in this journals
All Journal VALENSI ALCHEMY Jurnal Penelitian Kimia Indonesian Journal of Chemistry Jurnal Fisika : Fisika Sains dan Aplikasinya Indigenous Biologi Mitra Mahajana: Jurnal Pengabdian Masyarakat Jurna Beta Kimia Chemistry Notes
Fidelis Nitti
Department of Chemistry, University of Nusa Cendana, Jl. Adi Sucipto, Penfui, Kupang 85001, Nusa Tenggara Timur, Indonesia
Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Physics Public Health Social Sciences

Published : 24 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 24 Documents
Search

 1   2   3 
PROFIL SENYAWA POLAR DAN SEMI POLAR DAUN TEMBELEKAN (LANTANA CAMARA) ASAL PULAU TIMOR Kapitan, Origenes Boy Kapitan; Kusumawardhani, Dina T.; Nitti, Fidelis; Kedjo, Gervasia Y
INDIGENOUS BIOLOGI : JURNAL PENDIDIKAN DAN SAINS BIOLOGI Vol 7 No 3 (2024): INDIGENOUS BIOLOGI : JURNAL PENDIDIKAN DAN SAINS BIOLOGI
Publisher : Prodi Pendidikan Biologi FKIP Universitas Kristen Artha Wacana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33323/indigenous.v7i3.567

Abstract

Tembelekan (Lantana camara) is a shrub widely distributed in tropical regions, including the island of Timor. The arid and semi-arid tropical climate of Timor is believed to accumulate specific active chemical compounds different from other regions. Tembelekan leaves are processed into crude drugs and extracted using ethanol and ethyl acetate solvents. The preparation of ethanol and ethyl acetate extracts is carried out through the maceration method. The active chemical components of the ethanol and ethyl acetate extracts are characterized using FTIR and GC-MS. FTIR results indicate that the majority of functional groups present are similar due to the polar nature of the extracted compounds, with only a few differing functional groups between the two plant leaf extracts. GC-MS analysis reveals that the active chemical compounds in the ethanol extract of tembelekan leaves include hexadecanoic acid, phytol, 9,12,15-octadecatrienoic acid, 4,4-dimethyl-3-(3-methyl-3-buten-1-yliden)-2-methylidenbicyclo[4.1.0]heptane, and retinol. The active chemical compounds in the ethyl acetate extract of tembelekan leaves include tetradecanoic acid, 9,12,15-octadecatrienoic acid, squalene, 4,4-dimethyl-3-(3-methyl-3-buten-1-yliden)-2-methylidenbicyclo[4.1.0]heptane, and tricyclo[4.3.0.0(7,9)non-3-ene,2,2,5,5,8,8-hexamethyl-(1.alpha.,6.beta.,7.alpha.,9.alpha.). Metabolite secondary analysis of the plant using GC-MS shows that compounds in L. camara are dominated by derivatives of plant fatty acids (lipids) as an adaptation to the growing environment.
Low-Cost Adsorbent Development: Sulfuric Acid-Activated Teak Sawdust for Effective Methylene Blue Removal Baunsele, Anselmus Boy; Missa, Hildegardis; Siswanta, Dwi; Naat, Johnson N.; Neolaka, Yantus A. B.; Nitti, Fidelis; Lema, Abner Tonu; Basuki, Rahmat; Rahayu, Rahayu
Jurnal Kimia Valensi Jurnal Kimia VALENSI, Volume 10, No. 2, November 2024
Publisher : Department of Chemistry, Faculty of Science and Technology Syarif Hidayatullah Jakarta State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v10i2.41425

Abstract

The expansion of the global textile industry has resulted in a decline in environmental quality. Environmental pollution resulting from textile dye waste may include heavy metals and dyes, which exhibit carcinogenic and mutagenic effects. Many studies have been done to reduce the harm of dyes. Extensive research has been undertaken to mitigate the detrimental effects of dyes. One cost-effective approach for managing dye pollution is the adsorption of methylene blue using sulfuric acid-activated teak sawdust. Teak wood sawdust, a byproduct of the furniture industry that is abundant and underutilized, contains active sites within its constituent compounds, including cellulose, hemicellulose, and lignin. This study was designed to determine the ability of teak sawdust to adsorb methylene blue. In this investigation, the biosorbent will be characterized using fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and scanning electron microscopy-energy dispersive X-ray (SEM-EDX) to analyze its active sites and surface morphology. Additionally, the study aimed to elucidate the impact of variation contact time, pH solution, and alteration in methylene blue concentration on the adsorption capacity for methylene blue, employing a UV-Vis spectrophotometer for measurement. The research results demonstrated that optimal adsorption occurred at a contact time of 30 minutes and a pH of 6, with the adsorption efficiency reaching 99.67% as a function of contact time. The kinetic study was modeled using a pseudo-second-order approach, with a kinetic constant of 79.71 g mg⁻¹ min⁻¹. The maximum adsorption capacity was 1.351 mg g⁻¹, the n value was 1, and the percentage of methylene blue adsorbed reached 99.88%.
Surface Modification of Paper-Based Analytical Devices Using Polymer Inclusion Films as Optical Sensors for The Detection of Cu(II) Ions in Water Ajung, Oktaviani; Tambaru, David; Lapailaka, Titus; Kadang, Luther; Nitti, Fidelis
Jurnal Beta Kimia Vol 5 No 2 (2025): Volume 5 Number 2, November 2025
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/jbk.v5i2.24436

Abstract

This study presents the development of a microfluidic paper-based analytical device (µPAD) modified with a polymer inclusion film (PIF) for the detection of Cu(II) ions in aqueous samples. The PIF formulation comprised of polyvinyl chloride (PVC), bis(2-ethylhexyl)phosphoric acid (D2EHPA), and Aliquat-336, while sodium zincon salt served as the colorimetric reagent. The optimization was conducted by systematically varying several key parameters such as PIF composition and volume, reaction time, sample volume, and sample pH. The resulting color intensity was digitally quantified using smartphone, and the results were validated against UV–Vis spectrophotometry as the reference method. The optimized conditions were established at a composition of 50% PVC, 30% D2EHPA, 20% Aliquat-336 and 0.1% zincon, with a PIF volume of 20 µL, a reaction time of 40 minutes, a sample volume of 30 µL, and an optimal pH of 5. Under these conditions, the µPAD demonstrated excellent analytical performance, exhibiting strong linearity (R² = 0.9993), high precision (0.36%), good accuracy (0.368%), recovery rates between 98.18% and 102.44%, a limit of detection (LOD) of 0.143 mg/L, and a limit of quantification (LOQ) of 0.476 mg/L. Furthermore, selectivity assessments indicated that D2EHPA effectively reduced interference from Zn(II) ions, confirming the robustness of the developed sensing platform.
Analisis Konsentrasi Total Suspended Particulate (TSP) Udara Ambien Dan Proyeksi Risiko Kesehatan Di Kota Kupang Sambur, Ma'aki M. D.; Suwari, Suwari N.; Nitti, Fidelis
Chemistry Notes Vol 4 No 2 (2022): Chem. Notes 2022, 4 (2)
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/cn.v4i2.9655

Abstract

This study aims to determine the concentration of Total Suspended Particulate (TSP) in Kupang City and analyze public health risks. The sampling method used is the High Volume Air Sampler (HVAS) according to SNI 7119-3-2017. XRF analysis was carried out to determine the elements in the particulates. The results of the analysis showed that the highest concentration of TSP was 175.768 μg/m3. The highest intake value is 0.0206 mg/kg/day, the highest RQ value is 0.008. The elements detected were Si, K, Ca, Ti, Fe, Ni, Cu, Zn, Sr, Ba, Ce, Eu, and Yb. The results of the analysis show the concentration of TSP based on PP RI quality standards No. 22 of 2021 is still within safe limits, so there is no risk to public health in Kupang City.
Pemanfaatan Silika Gel Hasil Pengolahan Abu Tongkol Jagung Termodifikasi TiO2 untuk Mengurangi Kadar Nitrat dalam Limbah Cair Tahu Lulan, Theodore Y. K.; Ndolu, Intan C. M.; Nitti, Fidelis
Chemistry Notes Vol 5 No 2 (2023): Chem Notes, 5(2), 2023
Publisher : Universitas Nusa Cendana

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

Abstract

Research has been conducted with the title Utilization of Silica Gel from the processing of TiO2-Modified Corn Cob Ash to Reduce Nitrate Levels in Tofu Liquid Waste. This study aims to determine the characteristics of silica gel from the processing of TiO2-modified corn cob ash in terms of functional groups and crystallinity and to determine the effectiveness of TiO2-modified silica gel to reduce nitrate levels in tofu liquid waste using pH, time and concentration parameters. The synthesis of silica gel from corn cob ash was carried out using the sol gel method. The results of FTIR characterization showed the successful synthesis of silica gel and TiO2 modified silica gel indicated by the presence of Si-O-Si and Si-OH absorption in silica gel and Ti-O-Ti absorption in TiO2 modified silica gel. The XRD data shows that silica gel has an amorphous structure and modified silica gel has an anatase structure. The results showed that the largest nitrate reduction occurred at pH 5 by 98.69%, contact time of 60 minutes by 97.39% and optimum concentration of 200 ppm by 98.94% with the largest silica adsorption capacity of 245.94 mg/g and the percentage of nitrate reduction in tofu liquid waste by 99.94%.
PENENTUAN KANDUNGAN FLAVONOID DAN UJI AKTIVITAS ANTIOKSIDAN FRAKSI ETIL ASETAT EKSTRAK KULIT BATANG Sterculia foetida L. DENGAN METODE 2,2-azino-bis(3-ethyl benzothiazoline-6-sulfonic acid) (ABTS) Soi, Maria Yuliana; Lulan, Theo Y.K.; Nitti, Fidelis
Chemistry Notes Vol 7 No 1 (2025): Chem. Notes, 7(1), 2025
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/cn.v7i1.16260

Abstract

Penelitian ini telah dilakukan dengan tujuan untuk menentukan golongan senyawa yang terdapat dalam ekstrak metanol kulit batang Sterculia foetida L. serta total kandungan flavonoid dalam fraksi etil asetat ekstrak metanol kulit batang Sterculia foetida L. dengan metode spektrofotometri UV-Vis dan aktivitas antioksidan dengan metode 2,2-azino-bis(3-ethyl benzothia zoline-6-sulfonic acid) (ABTS). Hasil penelitian menunjukkan bahwa adanya kandungan triterpenoid/steroid, flavonoid dan tanin dalam ekstrak metanol S. foetida. Kandungan flavonoid total pada fraksi etil asetat ekstrak S. foetida sebesar 10,99 1,56 mg QE/g ekstrak, sedangkan untuk uji aktivtas antioksidan dari fraksi etil asetat sebesar 51,571% dengan bilai IC50 sebesar 92,04 ppm.
ANALISIS KADAR LOGAM TIMBAL (Pb) PADA AIR LAUT DAN IKAN BARONANG DI PERAIRAN PELABUHAN TENAU SECARA SPEKTROFOTOMETRI SERAPAN ATOM (SSA) Ledoh, Sherly M.F; Nitti, Fidelis; Ina, Rosinta Tamu
Chemistry Notes Vol 6 No 1 (2024): Chem. Notes, 6(1), 2024
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/cn.v6i1.17775

Abstract

ABSTRAK Telah dilakukan penelitian tentang analisis kadar logam timbal (Pb) pada air laut dan ikan baronang di perairan Pelabuhan Tenau. Penelitian ini bertujuan untuk mengetahui kadar logam berat timbal (Pb) pada air laut dan ikan baronang dengan destruksi kering. Hasil uji validasi metode analisis kadar timbal (Pb) pada air laut dan daging ikan baronang menggunakan Spektrofotomteri Serapan Atom (SSA) dengan panjang gelombang 283,3 nm dapat digolongkan dalam kategori teliti atau valid, dapat ditunjukkan dengan persamaan regresi linear y = 0,0218x – 0,0056 dengan nilai r = 0,9994; LoD sebesar 0,23 ppm; LoQ sebesar 0,77 ppm. Akurasi yang diperoleh pada konsentrasi Berdasarkan hasil analisis menunjukkan bahwa kadar logam berat timbal (Pb) pada air laut di perairan Pelabuhan Tenau sebesar 0,030 mg/L, sudah melebihi baku mutu yang telah ditetapkan oleh Kepmen LH No. 51 Tahun 2004 batas cemaran timbal (Pb) pada air laut sebesar 0,005 mg/L. Sedangkan kadar logam timbal (Pb) yang terdapat pada daging ikan baronang sebesar 1,629 mg/kg sudah melebihi baku mutu yang telah ditetapkan oleh Standar Nasional Indonesia (SNI) No. 7387 2009 yaitu 0,3 mg/kg dan sangat tidak layak dikonsumsi.
PENENTUAN KANDUNGAN TOTAL FLAVONOID DAN FENOLAT EKSTRAK n-HEKSANA AKAR, BATANG, DAN DAUN TUMBUHAN Crotalaria Retusa L Santos, Adelina Dos; Lulan, Theodore Y.K.; Nitti, Fidelis
Chemistry Notes Vol 6 No 2 (2024): Chem. Notes, 6(2), 2024
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/cn.v6i2.18083

Abstract

Telah dilakukan penelitian dengan tujuan untuk mengetahui senyawa metabolit sekunder, kandungan total flavonoid dan kandungan total fenolat pada ekstrak n-heksana akar, batang, dan daun tumbuhan Crotalaria retusa L. Penelitian ini meliputi pengujian kualitatif dan kuantitatif. Hasil penelitian pada ekstrak n-heksana akar, batang, dan daun tumbuhan C. retusa mengandung golongan senyawa metabolit sekunder flavonoid dan fenolat. Kandungan total flavonoid pada ekstrak akar, batang, dan daun tumbuhan C. retusa secara berturut- turut yaitu; 105, 282 ± 0, 376; 13, 326 dan 97,021 ± 0,100 mg QE/g, dan kandungan total fenolat akar, batang dan daun secara berturut-turut yaitu; 220,69 ± 0,464; 152,239 ± 0,066 dan 107, 309 ± 0,066 mg GAE/g
PERBANDINGAN KARAKTERISTIK PIM BERBASIS POLIVINIL KLORIDA, DI-(2- ETHYLHEXYL) PHOSPHORIC ACID DAN ASAM OLEAT SEBELUM DAN SESUDAH EKSTRAKSI Zn(II) DALAM SUASANA ASAM Nitti, Fidelis; ., Suwari; Kedang, Yoana Fransiska De Chantal
Chemistry Notes Vol 6 No 1 (2024): Chem. Notes, 6(1), 2024
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/cn.v6i1.20443

Abstract

Telah dilakukan penelitian dengan judul Perbandingan Karakteristik PIM Berbasis Polivinil Klorida, Di-(2-Ethylhexyl) Phosphoric Acid dan Asam Oleat Sebelum dan Sesudah Ekstraksi Zn(II) dalam Suasana Asam. Penelitian ini bertujuan untuk mengetahui kemampuan PIM dalam mengekstraksi Zn(II) serta perbandingan karakteristik sifat fisik dan kimia pada PIM sebelum dan sesudah dilakukan ekstraksi Zn(II) dalam suasana asam. Hal ini ditentukan dengan mengaplikasikan PIM untuk ekstraksi Zn(II) yang kemudian diuji sifat fisika dan kimianya berupa pengukuran Water Contact Angle, Water Uptake, Tensile Strength dan % Elongation serta karakterisasi PIM menggunakan Fourier Transform Infrared Spectroscopy (FTIR) dan Scanning Electron Microscope (SEM) untuk mengetahui kinerja dan stabilitas PIM dalam aplikasi selanjutnya. Hasil penelitian menunjukkan bahwa PIM mampu mengekstraksi Zn(II) dalam suasana asam sebanyak 21,24 mg/L dari konsentrasi 24 mg/L atau efisiensi pemisahan sebesar 88,5%. Sedangkan perbandingan karakterisasi FTIR , SEM serta nilai pengujian sifat fisik dan kimia sebelum dan sesudah ekstraksi tidak menunjukan perbedaan yang signifikan dimana membran masih bersifat hidrofilik dengan nilai Water Contact Angle dari 48,50 ke 46,60, Water Uptake dari 8,1% ke 11,7%. PIM juga bersifat fleksibel dengan nilai Tensile Strength dari 10,7 ke 5,6 Mpa dan %Elongation dari 172% ke 117,3%.
EKSPLORASI PEWARNA ALAMI DARI KULIT BUAH NAGA (Hylocereus Polyrhizus) DENGAN BESI(III) SEBAGAI MORDANTING Lakabela, Merliana; Ola, Pius D.; Nitti, Fidelis
Chemistry Notes Vol 6 No 2 (2024): Chem. Notes, 6(2), 2024
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/cn.v6i2.21356

Abstract

Telah dilakukan penelitian tentang pemanfaatan ekstrak etanol kulit buah naga (Hylocereus polyrhizus) sebagai pewarna kain katun dengan teknik pencelupan dengan besi(III) sebagai mordan. Proses mordanting dilakukan dengan tiga cara yaitu pre mordanting, mordan simultan dan post mordanting. Ketahanan warna diuji dengan mencuci dan menjemur kain yang telah diwarnai selama 5 jam (10.00-15.00 WITA). Pengaruh dari semua perlakuan tersebut diamati intensitas warna menggunakan metode pencitraan digital. Hasil penelitian menunjukkan bahwa teknik pre mordanting menghasilkan kain dengan intensitas warna paling tajam dan nilai intensitas warna paling rendah (108,3) yang berarti lebih banyak zat warna terikat pada kain. Uji ketahanan warna menunjukkan bahwa teknik post mordanting menghasilkan warna kain dengan daya tahan paling baik yang dibuktikan dengan nilai persen kelunturan paling rendah.
Co-Authors ., Suwari Abner Tonu Lema Agung Abadi Kiswandono Ajung, Oktaviani Anait, Johanes R. Anarato, Antonius Umbu Anselmus Boy Baunsele Antonius R.B. Ola Bartholomeus Pasangka Baunsele, Anselmus B. Baunsele, Since Dortia Bernandus Bernandus Bosirul Hoque Boymau, Benyamin Buhani Buhani Bukit, Minsyahril Daniel Wolo Darius Toge Kore David Tambaru Deram, Rosalia Febriana Dina Tiara Kusumawardhani Dwi Siswanta Febri Odel Nitbani Hery L. Sianturi Hildegardis Missa Ina, Rosinta Tamu Johannes, Albert Zicko Johnson N Naat Kadang, Luther Kalla, Eka B.S. Kapitan, Origenes Boy Kedang, Yoana Fransiska De Chantal Kedjo, Gervasia Y Kusmawan, Zipora A. Lakabela, Merliana Lapailaka, Titus Larbi Setti Lawa, Yosep Ledoh, Sherly M.F Lestarani, Dewi Lulan, Theo Y.K. Lulan, Theodore Y. K. Lulan, Theodore Y.K. Luther Kadang Meksianis Zadrak Ndii Modhe, Katarina Muhammad Cholid Djunaidi Nalle, Tamara Baba Nauledo, Gregorius Ndii, Meksianis Z Ndolu, Intan C. M. Neolaka, Yantus A B Odi Theofilus Edison Selan Ola, Pius D. Pasangka, Bartholomeus Philiphi de Rozari Philiphi de Rozari Pingak, Redi Kristian Pius Dore Ola Rahayu Rahayu Rahmat Basuki Reinner Ishaq Lerrick Rensini, William Antoni Rinawati Rinawati Sambur, Ma'aki M. D. Santos, Adelina Dos Sherlly Ledoh Soi, Maria Yuliana Soukaina Bouhmaidi Suharso Suharso Sutaji, Hadi Imam Suwari, Suwari N. Tanesib, Jehunias Leonidas Wendelina Archangela Ati Zakarias Seba Ngara Zulaicha, Annisaa Siti