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Chimica et Natura Acta
Published by Universitas Padjadjaran
ISSN : 23550864     EISSN : 25412574     DOI : -
Core Subject : Science, Agriculture, Social,
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemistry Environmental Science Materials Science & Nanotechnology
Chimica et Natura Acta diterbitkan oleh Departemen Kimia, FMIPA, Universitas Padjadjaran tiga kali setiap tahun pada bulan April, Agustus dan Desember. Artikel yang dimuat mencakup Kimia Analisis dan Pemisahan, Kimia Material, Kimia Energi dan Lingkungan, Kimia Organik Bahan Alam dan Sintesis, Biomolekular Pangan dan Kesehatan serta topik-topik lain yang berhubungan dengan ilmu Kimia.
Arjuna Subject : -
Articles 6 Documents
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Search results for , issue "Vol 11, No 2 (2023)" : 6 Documents clear
Synthesis and Crystal Structure of RbGdNb6Cl18 Fakhili Gulo; Saronom Silaban; Christiane Perrin
Chimica et Natura Acta Vol 11, No 2 (2023)
Publisher : Departemen Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/cna.v11.n2.47103

Abstract

A new quaternary niobium cluster chloride, RbGdNb6Cl18 has been prepared by solid state reaction methods. The RbCl, GdCl3, NbCl5, and niobium powder were mixed in stoichiometric proportions. This mixture was fed into a sealed quartz tube, and heated at 700ºC for 2 days. A single crystal was selected for use in determining the structure of this compound using a single crystal X-ray diffractometer. It crystallizes in the trigonal system, hexagonal setting with space group R-3 (No. 148). The unit cell parameters are: a = 9.3037(2) Å, c = 25.5752(2) Å, V = 1.917.17(7) Å3, and Z =3. The structure consists of discrete cluster units, [Nb6Cl18]4- that separated by Rb+ and Gd3+ cations in a close packed cubic stacking arrangement.
Pengaruh Konsentrasi Titanium Dioksida (TiO2) dan Ekstrak Etanol Daun Salam (Eugenia Polyantha Wight) terhadap Efektivitas Krim Tabir Surya Berbahan Baku Virgin Coconut Oil (VCO) Tri Firdatuh Rozqiah; Eni Widiyati; Agus Martono Hadi Putranto; Eka Angasa; Dyah Fitriani
Chimica et Natura Acta Vol 11, No 2 (2023)
Publisher : Departemen Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/cna.v11.n2.45155

Abstract

Telah dilakukan penelitian tentang pengaruh konsentrasi titanium dioksida (TiO2) dan ekstrak etanol daun salam (Eugenia polyantha wight) terhadap efektivitas krim tabir surya berbahan baku virgin coconut oil (VCO). Krim tabir surya dibuat dengan cara mencampurkan fase air (gliserin, trietanolamin (TEA), metil paraben, akuades) dan fase minyak (VCO, asam stearat, lanolin, setil alkohol, propil paraben) serta ditambahkan bahan aktif TiO2 dan ekstrak etanol daun salam, lalu diaduk hingga terbentuk krim yang homogen. Krim yang dihasilkan ditentukan karakteristiknya yaitu pH, homogenitas, viskositas, serapan radiasi ultraviolet (UV) dan sun protection factor (SPF). Efektivitas krim tabir surya dapat ditentukan dari SPF yang dihitung. Hasil penelitian menunjukkan bahwa krim yang dihasilkan memiliki susunan yang homogen, pH 7,2-7,75, viskositas 6160-12400 cP. Konsentrasi ekstrak etanol daun salam dan TiO2 berpengaruh terhadap SPF krim. Jika konsentrasi TiO2 dan ekstrak etanol daun salam ditingkatkan, maka SPF krim juga akan meningkat. Krim dengan ekstrak etanol daun salam 1,5% dan TiO2 6% memiliki SPF 2,206 yang menurut food and drug administration (FDA) termasuk dalam tipe proteksi minimal.
Modifikasi Karbon Berpori Eceng Gondok Doping Nitrogen Untuk Matrik Katoda Baterai Litium Sulfur Dengan Kapasitas Tinggi Otong Nurhilal; Sahrul Hidayat; Dadan Sumiarsa; Risdiana Risdiana
Chimica et Natura Acta Vol 11, No 2 (2023)
Publisher : Departemen Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/cna.v11.n2.46078

Abstract

Karbon berpori dari biomassa menjadi kandidat potensial untuk matrik katoda baterai litium sulfur. Karbon berpori harus memiliki konduktivitas listrik yang tinggi untuk meningkatkan kontak elektrik sulfur yang bersifat isolator.  Modifikasi karbon berpori doping N diperlukan untuk meningkatkan kinerja baterai litium sulfur. Pada penelitian ini telah dibuat karbon berpori Eceng Gondok doping N, selanjutnya dikompositkan dengan sulfur dan diaplikasikan untuk katoda baterai litium sulfur. Hasil pengujian dengan FTIR menunjukkan adanya gugus C=N pada 1657 cm-1. Hasil pengujian SEM-EDS terhadap komposit karbon berpori doping N/sulfur diperoleh kadar sulfur sebesar 66,95 wt% untuk rasio 1:2,5. Hasil pengujian dengan four line probe (FLP) diperoleh konduktivitas listrik karbon berpori doping N sebesar 17,16 x 10-2 S/cm, komposit karbon berpori doping N/sulfur sebesar 14,61 x 10-4 S/cm. Katoda baterai litium sulfur telah berhasil dibuat dari komposit KBEGN/S dengan ketebalan 200 mm dan kandungan sulfur sebesar 4,93 mg/cm2. Hasil pengukuran charge-discharge baterai diperoleh kapasitas pengosongan awal sebesar 584 mAh/g. Nilai kapasitas pengosongan awal yang diperoleh lebih besar dari baterai dengan karbon berpori tanpa doping N sebesar 312 mAh/g untuk kandungan sulfur 3,57 mg/cm2.
The Study of Plasmonic Chip of Nata de Sago-green Silver Nanoparticles for Detection of Blood Glucose Abdul Haris Haris Watoni; La Ode A. Nur Ramadhan; Evy Nuryah Adha; Robby Sudarman
Chimica et Natura Acta Vol 11, No 2 (2023)
Publisher : Departemen Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/cna.v11.n2.45909

Abstract

The innovation of rapid blood glucose level detectors using chemical sensors still needs to be carried out continuously. Nata de sago has good potential as a safe sensor chip for blood glucose detection. To increase the detection speed, this sensor chip can be composited with silver nanoparticles (AgNPs)-bidara leaf extract which has plasmonic properties when interacting with visible radiation. The principle of blood glucose detection with the nata de sago-AgNPs-bidara leaf extract composite chip is based on van der Waals interactions between the functional groups in nata de sago and the hydroxyl groups in glucose compounds which are strengthened by the plasmonic nature of AgNPs.This study aims to synthesize and characterize nata de sago cellulose composite films embedded with silver nanoparticles as blood sugar detection sensor chips. Silver nanoparticles (AgNPs) were synthesized from AgNO3 precursors using bioreductors and capping agents of bidara leaf extract (Ziziphus mauritiana L.) with various volume ratios of precursor to bioreductor 1:1, 1:2, 1:3, 1:4, 1:5 and 1:6. The nata de sago-AgNPs-bidara leaf extract composite was made by soaking the nata de sago film in a suspension of AgNPs-bidara leaf extract for 1 hour until the film turned yellow. The film was then dried for 24 hours at room temperature to obtain a cuvette type plasmonic film which was ready for characterization and validation.FTIR analysis showed the formation of silver particles based on vibrational spectra changes of functional groups of bioreductor compounds at wave numbers 3423 cm-1, 2924 cm-1, 1641 cm-1 and 1056 cm-1. Morphological analysis using a digital microscope showed that the AgNPs were not uniformly spherical. Particle size analysis using a UV-Vis spectrophotometer showed that the AgNPs formed had an estimated diameter of 32.231 – 82.261 nm. Composite film of nata de sago-AgNPs-bidara leaf extract can be used as a blood glucose sensor chip by UV-Vis spectrophotometry with LOD = 30.814 mg/dL, LOQ = 50.814, %RSD = 5.015, and %R 90.68. The values of these parameters indicate that the sensor chip has good precision (%RSD) and accuracy (%R).
Review Article: Effect of Co-Expression Chaperones on the Expression of Intracellular Recombinant Proteins in Escherichia coli Diandra Firdiani Utami; Mamlikatu Ilmi Azizah; Sriwidodo Sriwidodo; Ryan Adibagus Haryanto; Riyona Desvy Pratiwi; Iman Permana Maksum
Chimica et Natura Acta Vol 11, No 2 (2023)
Publisher : Departemen Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/cna.v11.n2.46480

Abstract

Escherichia coli is widely used as a host for expressing recombinant proteins due to its well-studied genetics, fast growth, relatively low production costs, and high rate of protein expression. However, despite the high rate of protein expression, the availability of chaperone proteins was often insufficient, resulting in the formation of inclusion bodies due to errors in protein folding. These inclusion bodies can cause the protein to become inactive, and proper protein folding is crucial for maintaining the structure and function of proteins in living organisms. To overcome this limitation, chaperones have been developed as a strategy to help prevent protein folding errors and increase the recovery of soluble protein. In this review, we summarize several experiments related to co-expressing chaperones to enhance the expression of recombinant proteins in E. coli.
Steroid dari Kulit Batang Aglaia glabrata dan Aktivitas Sitotoksinya terhadap Sel Kanker Leukemia P-388 Risyandi Anwar; Desi Harneti; Vidia Afina Nuraini; Faizah Maira; Nurlelasari Nurlelasari; Tri Mayanti; Rani Maharani; Unang Supratman; Khalijah Awang
Chimica et Natura Acta Vol 11, No 2 (2023)
Publisher : Departemen Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/cna.v11.n2.48980

Abstract

Steroid saponin baru, b-sitosterol-3-O-beta-D-galaktopiranosil-(1-4)-beta-D-glukopiranosida (1), bersama dengan empat steroid yang diketahui (2-5) diisolasi dari kulit batang dari Aglaia glabrata. Struktur kimia senyawa baru dijelaskan berdasarkan data-data spektroskopi. Semua senyawa diuji aktivitas sitotoksiknya terhadap sel kanker leukemia murine P-388. Diantara senyawa yang diisolasi tersebut, stigmasterol (4) menunjukkan aktivitas sitotoksik terkuat dengan nilai IC50 sebesar 12.2 mg/mL.

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