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Sifat Mekanik Membran Berbasis Paduan Kitosan Suksinat-Kitosan Terinsersi Litium Ramadhan, L.O.A.N; Sabarwati, S. H.; Amiruddin, Amiruddin; Harniati, Harniati; Susanti, Susanti
Jurnal Kimia dan Kemasan Vol. 36 No. 2 Oktober 2014
Publisher : Balai Besar Kimia dan Kemasan

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Sifat mekanik merupakan salah satu karakter yang penting dalam pengembangan material polimer fungsional seperti membran elektrolit yang berpotensi untuk penghantar litium. Dalam penelitian yang telah dilakukan, membran elektrolit disintesis dengan bahan dasar kitosan suksinat dan kitosan, serta litium. Membran dipreparasi melalui metode inversi fasa dengan variasi komposisi fraksi massa kitosan suksinat dan kitosan. Selanjutnya dilakukan uji sifat mekanik. Hasil penelitian menunjukkan bahwa peningkatan fraksi massa kitosan suksinat sampai dengan 60% (b/b) cenderung meningkatkan kekuatan tarik dan perpanjangan, serta menurunkan Modulus Young. Pada fraksi massa kitosan suksinat 70% (b/b) sampai dengan 80% (b/b), kekuatan tarik dan perpanjangan cenderung menurun, serta Modulus Young meningkat. Nilai maksimum kekuatan tarik, perpanjangan, dan Modulus Young masing-masing adalah 0,18 MPa, 112 %, dan 14,31 MPa. Berdasarkan hasil analisis sifat mekaniknya, membran paduan kitosan suksinat-kitosan terinsersi litium memiliki stabilitas mekanik yang cukup baik.Â

Sifat Mekanik Membran Berbasis Paduan Kitosan Suksinat-Kitosan Terinsersi Litium L.O.A.N Ramadhan; S. H. Sabarwati; Amiruddin Amiruddin; Harniati Harniati; Susanti Susanti
Jurnal Kimia dan Kemasan Vol. 36 No. 2 Oktober 2014
Publisher : Balai Besar Kimia dan Kemasan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24817/jkk.v36i2.1893

Sifat mekanik merupakan salah satu karakter yang penting dalam pengembangan material polimer fungsional seperti membran elektrolit yang berpotensi untuk penghantar litium. Dalam penelitian yang telah dilakukan, membran elektrolit disintesis dengan bahan dasar kitosan suksinat dan kitosan, serta litium. Membran dipreparasi melalui metode inversi fasa dengan variasi komposisi fraksi massa kitosan suksinat dan kitosan. Selanjutnya dilakukan uji sifat mekanik. Hasil penelitian menunjukkan bahwa peningkatan fraksi massa kitosan suksinat sampai dengan 60% (b/b) cenderung meningkatkan kekuatan tarik dan perpanjangan, serta menurunkan Modulus Young. Pada fraksi massa kitosan suksinat 70% (b/b) sampai dengan 80% (b/b), kekuatan tarik dan perpanjangan cenderung menurun, serta Modulus Young meningkat. Nilai maksimum kekuatan tarik, perpanjangan, dan Modulus Young masing-masing adalah 0,18 MPa, 112 %, dan 14,31 MPa. Berdasarkan hasil analisis sifat mekaniknya, membran paduan kitosan suksinat-kitosan terinsersi litium memiliki stabilitas mekanik yang cukup baik.

Sifat Mekanik Membran Berbasis Paduan Kitosan Suksinat-Kitosan Terinsersi Litium L.O.A.N Ramadhan; S. H. Sabarwati; Amiruddin Amiruddin; Harniati Harniati; Susanti Susanti
Jurnal Kimia dan Kemasan Vol. 36 No. 2 Oktober 2014
Publisher : Balai Besar Kimia dan Kemasan

Sifat mekanik merupakan salah satu karakter yang penting dalam pengembangan material polimer fungsional seperti membran elektrolit yang berpotensi untuk penghantar litium. Dalam penelitian yang telah dilakukan, membran elektrolit disintesis dengan bahan dasar kitosan suksinat dan kitosan, serta litium. Membran dipreparasi melalui metode inversi fasa dengan variasi komposisi fraksi massa kitosan suksinat dan kitosan. Selanjutnya dilakukan uji sifat mekanik. Hasil penelitian menunjukkan bahwa peningkatan fraksi massa kitosan suksinat sampai dengan 60% (b/b) cenderung meningkatkan kekuatan tarik dan perpanjangan, serta menurunkan Modulus Young. Pada fraksi massa kitosan suksinat 70% (b/b) sampai dengan 80% (b/b), kekuatan tarik dan perpanjangan cenderung menurun, serta Modulus Young meningkat. Nilai maksimum kekuatan tarik, perpanjangan, dan Modulus Young masing-masing adalah 0,18 MPa, 112 %, dan 14,31 MPa. Berdasarkan hasil analisis sifat mekaniknya, membran paduan kitosan suksinat-kitosan terinsersi litium memiliki stabilitas mekanik yang cukup baik.

Isolasi dan Identifikasi Senyawa (-)-Asam Usnat dari Lichen Usnea sp. serta Aktivitas Sitotoksiknya terhadap Sel Murine Leukemia P388 MAULIDIYAH MAULIDIYAH; THAMRIN AZIS; SITTI HADIJAH SABARWATI; MUHAMMAD NURDIN
JURNAL ILMU KEFARMASIAN INDONESIA Vol 13 No 1 (2015): JIFI
Publisher : Fakultas Farmasi Universitas Pancasila

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Lichen is a symbiotic organism composed by algae and fungi that already known produces spesific secondary metabolites having bioactivities. The aim of this study were to isolate and determine the structure of secondary metabolites of Lichen Usnea sp. and to examine the cytotoxic activity against murine leukemia P388 cells. Isolation was carried out by utilizing colom chromatography using silica gel 60 stationary phase with eluent mixtures of n-hexane and ethyl acetate in a gradient elution. Isolates compounds were identified using UV-Vis spectroscopy, IR, 1H-NMR and 13C-NMR. The identification result obtained was (-)-usnic acid compound with molecular weight (MW) of 344 g/mol, needle-shaped yellow crystals. Test results cytotoxic compound of (-)-usnic acid against murine leukemia P388 cells were derived IC50 5.738 ± 0.61 µg/mL.

Functionalization of Chitosan with Maleic Anhydride for Proton Exchange Membrane Muhammad Ridwan Septiawan; Dian Permana; Sitti Hadijah Sabarwati; La Ode Ahmad; La Ode Ahmad Nur Ramadhan
Indonesian Journal of Chemistry Vol 18, No 2 (2018)
Publisher : Universitas Gadjah Mada

Chitosan was modified by maleic anhydride, and it was then functionalized using heterogeneous and blending method to obtain the membrane. The results of the reaction between chitosan with maleic anhydride were signed by the new peak appears around 1475 cm-1 which attributed to C=C bending of alkene. The new peak also appears at 1590 cm-1 which attributed to N-H bending of amide. Chitosan-maleic anhydride membranes show microstructure of chitosan membrane with high porous density and rigidity while chitosan-maleic anhydride membranes have clusters. In addition, the thermal tenacity of membranes reached 500 °C. Modified membrane by heterogeneous and blending method have higher water uptake, ion exchange capacity, and proton conductivity than chitosan membrane. Moreover, the blending method is much more effective than the heterogeneous method that can be exhibited from ion exchange capacity and proton conductivity values of 1.08–6.38 meq g-1 and 1x10-3–1x10-2 S cm-1, 0.92–2.27 meq g-1 and 1.53x10-4–3.04x10-3 S cm-1, respectively. The results imply that modification of chitosan membrane with the addition of maleic anhydride using heterogeneous and blending method can be applied to proton exchange membrane.

Microwave Assisted Extraction of Banana Stem Waste and its Antifungal Activity against Fusarium Oxysporum Mashuni Mashuni; muhammad Natsir; Sudirman Sudirman; Sitti Hadijah Sabarwati; Fitri Handayani Hamid; M. Jahiding
International Journal of Science Technology and Health Vol 1 No 1 (2023): Science Technology and Health
Publisher : LPPM ISTEK 'Aisyiyah Kendari

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Banana stem (BS) waste is obtained in large quantities in banana production. In this work, microwave extraction (MAE) from BS was used, and the solvent concentration parameters were 50%, 60%, 70%, 80%, 96% (v/v) ethanol, and 5% HCl with a sample weight of 10 g each. The influence of solvent, time, temperature, and solid: the liquid ratio was evaluated on the extraction results. Total phenolic content (TPC) and its functional performance against Fusarium oxysporum. The effect of a high ethanol concentration on BS extraction was observed because the higher ethanol solvent concentration resulted in higher extraction results and TPC. Optimal MAE conditions were determined at 200 watts for 20 minutes, with 80% ethanol showing better TPC results than other ethanol concentrations, namely 0.7171 mg g-1. The results of chemical content analysis using gas chromatography–mass spectrometry (GC-MS) of BS extract of 80% ethanol obtained phenolic compounds, carboxylic acids, aldehydes, esters, ketones, and furans. BS extract of 80% ethanol showed antifungal activity of Fusarium oxysporum with an apparent zone diameter of 9.7 mm (moderate category). It can be concluded that MAE is an efficient technique for releasing bioactive molecules from BS with TPC and antifungal applications in the agricultural industry.

Microwave-assisted extraction of Phenolic Compounds from Pineapple Peel against Staphylococcus aureus and Escherichia coli Mashuni Mashuni; Fitri Handayani Hamid; M Jahiding; Nur Cahya Islamiati MR; Sitti Hadijah Sabarwati; Andi Muhammad Naufal Khaeri
International Journal of Science Technology and Health Vol 2 No 1 (2024): Science, Technology and Health
Publisher : LPPM ISTEK 'Aisyiyah Kendari

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Pineapple production is mostly marketed as a processed product, resulting in large amounts of industrial waste consisting of pineapple peel, core and crown. This study evaluated organic solvents for microwave-assisted extraction (MAE) of phenolic compounds from pineapple peel and their total phenolic content and antibacterial activities. The application of microwave technology in phenolic extraction provides a fast extraction process and produces higher yields. In addition, organic solvent ethanol is considered an environmentally friendly solvent characterized by low toxicity and increased capacity to extract bioactive compounds. The solvent compositions are ethanol (80%), ethanol-HCl (80%-5%), and ethanol-NaOH (80%-5%). A higher phenolic compound was obtained using ethanol-HCl (80%-5%) of 2.68 mg eq GA/g DW. The results of the antibacterial activity test against Staphylococcus aureus was 19.00 mm and Escherichia coli was 19.31 mm. These results indicate that pineapple peel extract from ethanol-HCl solvent can be an effective antibacterial agent.

Isolation and Characterization of Flavonoid Derivative of Ethyl Acetate Extract from Bauhinia latisiliqua Stem Bark and Its Activity as Antioxidant Sitti Hadijah Sabarwati; Indriani Indriani; Nurhaeni Nurhaeni; Ahmad Ridhay; Pasjan Satrimafitrah; Jaya Hardi; Rismawaty Sikanna
al Kimiya: Jurnal Ilmu Kimia dan Terapan Vol 10, No 2 (2023): al Kimiya: Jurnal Ilmu Kimia dan Terapan
Publisher : Department of Chemistry, Faculty of Science and Technology, UIN Sunan Gunung Djati Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15575/ak.v10i2.30372

Various bioactivities on natural compounds, the antioxidant potency can provide a broad spectrum in their utilization and development into medicinal raw material. One of the plants that have potency for antioxidant activity is the Kemerakan sapenit (Bauhinia latisilqua) plant. The study aimed to isolate, characterize, and determine the antioxidant activity of a compound isolated in the ethyl acetate extract of the stem bark of B. latisilqua. This research includes extraction, fractionation, purification, and elucidation of secondary metabolite structure as well as testing its antioxidant activity. Extraction was carried out by maceration technique, fractionation, and purification using liquid vacuum chromatography and gravitation column chromatography. The elucidation of the structural compound was determined by analysis of the UV, IR, and NMR spectra. The antioxidant test was performed using the DPPH method. Based on the analysis of the spectral data, the isolated compound was catechin, a derivative of flavan-3-ol. Antioxidant test on catechin compound showed a strong antioxidant with an IC50 value of 35.01 µg /mL (IC50 for positive control, ascorbic acid, of 42.94 µg /mL).

Pengenalan Teknik Dasar Laboratorium terhadap Siswa-Siswi MA Asy-Syafi’iyah Kendari di Laboratorium Unit Kimia UPT Lab. Terpadu Universitas Halu Oleo Laily Nurliana; Halimatussaddiyah Ritonga; Sitti Hadijah Sabarwati; Rustam Musta
Jurnal Inovasi Pengabdian Masyarakat Pendidikan Vol. 5 No. 2 (2025): Vol. 5 No. 2
Publisher : Universitas Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/jurnalinovasi.v5i2.37381

Implementasi kurikulum merdeka belajar dapat dilakukan dengan kerjasama antara pihak Universitas dan SMA sederajat dalam mencapai cita-cita kebijakan merdeka belajar yaitu mewujudkan pendidikan berkualitas yang berfokus pada pengembangan kompetensi dasar dan pendidikan karakter sesuai profil pelajar Pancasila. Salah satu metode untuk merealisasikan pendidikan yang berkualitas adalah melalui proses metode ilmiah yang dapat dilakukan siswa dalam pembelajaran kimia dengan sarana laboratorium kimia. UPT Laboratorium Terpadu Unit Laboratorium Kimia UHO melakukan kerjasama dengan MA Asy-Syafi’iyah Kendari dalam rangka memberikan pengalaman kepada siswa tentang bagaimana melakukan praktikum di Laboratorium sebagai implementasi kurikulum merdeka belajar. Metode yang digunakan dalam kegiatan ini adalah metode ekspositori (ceramah) dan demonstrasi (praktikum), serta evaluasi menggunakan pre-test dan post-test. Setelah pelaksanaan kegiatan pengabdian ini dapat disimpulkan bahwa kegiatan pengabdian ini berjalan dengan baik dan memberikan manfaat bagi para siswa-siswi MA Asy-Syafi’iyah Kendari sebagai peserta dalam menambah pengetahuan tentang materi praktikum pengenalan alat bahan, pembuatan larutan dan reaksi asam basa. Hal tersebut dapat terlihat dari hasil analisis n-Gain sebesar 0,32 dimana nilai tersebut masuk dalam kategori lompatan nilai sedang yang menunjukkan bahwa pelatihan cukup memperlihatkan dampak yang signifikan.

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