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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

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PENGEMBANGAN SENSOR BERBASIS KERTAS DENGAN DETEKTOR SMARTPHONE UNTUK ANALISIS BORAKS DALAM MATRIKS MIE BASAH Tambaru, David; Kusmawan, Zipora A.; Nauledo, Gregorius; Nitti, Fidelis
Chemistry Notes Vol 7 No 2 (2025): Chem. Notes, 7(2), 2025
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/cn.v7i2.26342

Abstract

Mie adalah salah satu makanan yang sangat umum di masyarakat termasuk Indonesia. Namun, mie kadang mengandung boraks, suatu zat kimia yang bersifat racun sehingga sangat berbahaya. Oleh karena itu, pengujian kandungan boraks pada mie, khususnya mie basah, perlu dilakukan secara rutin. Metode analisis boraks yang ada selama ini, biasanya menggunakan metode spektrofotometri UV-Vis. Namun mentode tersebut membutuhkan biaya mahal, dan kurang praktis untuk digunakan di lapangan. Sementara itu, sensor berbasis kertas telah menjadi alternatif dalam deteksi berbagai analit karena murah, praktis, tidak membutuhkan peralatan canggih, serta penggunaan sampel dan pereaksi yang sedikit. Selain itu metode ini dapat dibuat lebih praktis lagi dengan menggunakan smartphone sebagai detektor yang dapat dibawa ke mana-mana. Sistem deteksi boraks dengan metode ini didasarkan pada reaksi antara boraks dengan kurkumin dalam suasana asam untuk membentuk senyawa rososianin yang berwarna merah. Pereaksi terlebih dahulu diimobilisasi pada kertas kertas saring yang telah dipotong membentuk lingkaran berdiameter 0.6 mm, dan setelah kering, siap digunakan sebagai sensor boraks dengan meneteskan sampel di atas kertas yang telah mengandung pereaksi. Reaksi dengan boraks akan menyebabkan terbentuknya warna merah pada sensor, yang kemudian difoto dengan kamera smartphone. Dengan pencitraan digital, foto dianalisis dan intensitas warnanya. Pada kondisi optimum, hasil penelitian menunjukan bahwa intensitas merah hasil reaksi berbanding lurus dengan konsentrasi boraks pada rentang 0,05-1,0 ppm dan 30 – 100 ppm, dengan persamaan regresi linear masing-masing adalah y = 13,24x + 11,63 dan y = 0,196x + 45,45 dan koefisien korelasi (R2) berturut-turut adalah 0,995 dan 0,992.
Pembuatan Polymer Inclusion Membrane (PIM) Teremban 2,4,5-Trimetoksikalkon dan Uji Kompatibilitasnya Reinner Ishaq Lerrick; Darius Toge Kore; Philiphi de Rozari; Febri Odel Nitbani; Fidelis Nitti; Johnson N Naat
ALCHEMY Jurnal Penelitian Kimia Vol 21, No 2 (2025): September
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.21.2.96111.305-314

Abstract

Polymer Inclusion Membrane (PIM) telah menjadi perangkat baru untuk mengekstraksi ion logam terutama dari larutan, karena selektivitas dan sensitivitasnya yang mudah disesuaikan melalui pembuatannya yang mudah. Ragam senyawa ekstraktan telah banyak dikembangkan dalam studi ekstraksi logam berbasis PIM. Namun, senyawa kalkon dan turunannya yang umum diketahui sebagai ekstraktan dan sensor logam, belum ditemukan penggunaannya dalam studi terkait PIM. Pada riset ini, senyawa 2,4,5-trimetoksikalkon, disintesis dari oksidasi minyak asaron asal Timor menggunakan ozon dan diikuti oleh reaksi kondensasi aldol dengan asetofenon, akan diembankan ke dalam matriks PIM PVC/D2EHPA. PIM yang disiapkan tersebut kemudian dikarakterisasi menggunakan Fourier Transform Infrared (FTIR) dan Scanning Electron Microscopy (SEM), serta dipelajari kompatibilitasnya. PIM yang mengandung 60% PVC, 40% D2EHPA dan berbagai konsentrasi 2,4,5-trimetoksikalkon (25, 20, 15, 10, dan 5 ppm) mempunyai sudut kontak air masing-masing sebesar 51,939º, 51,665º, 51,318º, 51,151º, dan 50,863º; serta nilai penyerapan air masing-masing sebesar 9,80%; 9,82%; 9,54%; 9,68%; dan 9,76% yang menunjukkan bahwa PIM yang dihasilkan bersifat hidrofilik. Sementara itu, hasil pengukuran kuat tarik dan persentase perpanjangan menunjukkan bahwa PIM tersebut bersifat fleksibel dengan nilai yang diperoleh masing-masing 12,15; 11,96; 11,91; 10,95; 10,22 MPa dan 32,7; 86,6; 127; 156,7; 166,7%.Preparation of Polymer Inclusion Membrane (PIM)-Embedded 2,4,5-Trimethoxychalcone and Its Compatibility Study. Polymer Inclusion Membrane (PIM) has become an emerging device for extracting metal ions, especially from solution, due to its selectivity and sensitivity fine-tuned through facile preparation. Chalcones, as well as their derivatives, which are known as metal extractants and sensors, have not been employed in PIM-related studies. In this research, the compound 2,4,5-trimethoxychalcone, synthesized sequentially over Timor’s asarone oil oxidation using ozone, followed by Aldol condensation reaction with acetophenone, was embedded into the PVC/D2EHPA PIM matrices. The prepared PIM was then characterized using Fourier transform infrared (FTIR) and Scanning electron microscopy (SEM), and was studied for its compatibility. PIM contained 60% PVC, 40% D2EHPA and varied 2,4,5-trimethoxychalcone (25, 20, 15, 10, and 5 ppm) had water contact angles values of 51.939º, 51.665º, 51.318º, 51.151º, 50.863º, and water uptake of 9.80%, 9.82%, 9.54%, 9.68%, 9.76% respectively, which indicated that the resulting PIM was hydrophilic. Meanwhile, the tensile strength and elongation percentage showed that those PIM were flexible with the obtained values of 12.15, 11.96, 11.91, 10.95, 10.22 MPa and 32.7, 86.6, 127, 156.7, 166.7%, respectively.
Surface Modification of Paper-Based Analytical Devices Using Polymer Inclusion Films as Optical Sensors for The Detection of Cu(II) Ions in Water Oktaviani Ajung; David Tambaru; Titus Lapailaka; Luther Kadang; Fidelis Nitti
Jurnal Beta Kimia Vol 5 No 2 (2025): Volume 5 Issue 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.
ENVIRONMENTAL CONSERVATION ACTION THROUGH COMMUNITY-BASED MANGROVE SEEDLING PLANTING IN EDUCATION AND SOCIETY: THE FOLU GOES TO SCHOOL Since Dortia Baunsele; Fidelis Nitti; Daniel Wolo
Mitra Mahajana: Jurnal Pengabdian Masyarakat Vol. 7 No. 1 (2026): Volume 7 Nomor 1 Maret 2026
Publisher : LPPM Universitas Flores

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37478/mahajana.v7i1.7602

Abstract

This community service activity aims to enhance students' and community members' knowledge, awareness, and participation in climate change mitigation efforts through socialization and mangrove seedling planting. The selection of mangrove seedling planting locations is based on observations of degrading mangrove forests that still have the potential for natural regeneration. In addition, the location is prioritized in areas experiencing anthropogenic pressure, coastal erosion, and excessive sedimentation. Socio-economic considerations are also a key factor. The planting location is close to residential areas to encourage public participation and environmental awareness. This activity is carried out in the mangrove forest tourism area, Oesapa village, Kelapa Lima sub-district, Kupang City, over a period of 2 months, namely November – December. The method for implementing the activity consists of three stages: socializing students about the role of mangrove forests; cleaning the area with the surrounding community; planting mangrove seedlings; and initial maintenance and monitoring. In addition to increasing knowledge and awareness of mangrove forests' functions, this activity also contributes to the rehabilitation of mangrove areas. It strengthens collaboration among students, the community, the government, and academics in the effort to preserve mangrove forests.
Co-Authors ., Suwari Abner Tonu Lema Agung Abadi Kiswandono 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 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. Luther Kadang 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 Oktaviani Ajung 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 Since Dortia Baunsele Soi, Maria Yuliana Soukaina Bouhmaidi Suharso Suharso Sutaji, Hadi Imam Suwari, Suwari N. Tanesib, Jehunias Leonidas Theodore Y. K. Lulan Titus Lapailaka Wendelina Archangela Ati Zakarias Seba Ngara Zulaicha, Annisaa Siti