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All Journal Jurnal Pendidikan Kimia Sains Natural: Journal of Biology and Chemistry Molekul: Jurnal Ilmiah Kimia
Nina Ariesta
Departemen Of Chemistry, Universitas Nusa Bangsa
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education

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PENGARUH PEMBELAJARAN KIMIA DENGAN PENDEKATAN CTL (CONTEXTUAL TEACHING AND LEARNING) MELALUI METODE GUIDED INQUIRY DAN PROYEK TERHADAP PRESTASI BELAJAR DITINJAU DARI KEMAMPUAN MATEMATIK SISWA PADA MATERI KELARUTAN DAN HASIL KALI KELARUTAN KELAS XI IPA SMA Ariesta, Nina; Dwi Ariani, Sri Retno; Haryono, .
Jurnal Pendidikan Kimia Vol 2, No 3 (2013)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (570.58 KB)

Abstract

Penelitian ini bertujuan untuk mengetahui apakah pembelajaran kimia melalui pendekatan CTL dengan metode GI dan proyek berpengaruh terhadap prestasi ditinjau dari kemampuan matematik siswa pada materi kelarutan dan hasil kali kelarutan, apakah kemampuan matematik siswa berpengaruh terhadap prestasi belajar siswa pada materi pokok kelarutan dan hasil kali kelarutan, dan adakah interaksi antara pembelajaran kimia melalui pendekatan CTL dengan metode GI dan proyek dengan kemampuan matematik siswa terhadap prestasi belajar siswa pada materi kelarutan dan hasil kali kelarutan. Penelitian ini menggunakan rancangan penelitian desain faktorial 2x2. Sampel diambil dengan teknik Cluster Random Sampling, sehingga didapatkan dua kelas XI IPA di SMA N 1 Karanganyar. Teknik analisis data untuk pengujian hipotesis dilakukan dengan uji Anava Dua Jalan Sel Tak Sama. Hasil penelitian menunjukkan bahwa prestasi belajar siswa pada pembelajaran kimia melalui pendekatan CTL dengan metode GI lebih tinggi daripada siswa dengan pembelajaran kimia melalui pendekatan CTL dengan metode proyek, prestasi belajar siswa yang memiliki kemampuan matematik tinggi lebih tinggi daripada siswa dengan kemampuan matematik rendah pada materi kelarutan dan hasil kali kelarutan, dan tidak ada interaksi antara pembelajaran kimia melalui pendekatan CTL dengan metode GI dan proyek dengan kemampuan matematik siswa terhadap prestasi belajar siswa pada materi kelarutan dan hasil kali kelarutan. Kata Kunci : pendekatan CTL, kemampuan matematik, Guided Inquiry, proyek, Kelarutan dan Hasil Kali Kelarutan.
KARAKTERISTIK MEMBRAN KOMPOSIT BERBASIS KITOSAN/PVA TERMODIFIKASI LEMPUNG DARI BABAKAN MADANG BOGOR Thria Kharisma; Nina Ariesta; Dian Arrisujaya
JURNAL SAINS NATURAL Vol. 10 No. 1 (2020): Sains Natural
Publisher : Universitas Nusa Bangsa

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (604.439 KB) | DOI: 10.31938/jsn.v10i1.276

Abstract

The use of natural polymers as membranes of DMFC from chitosan was developed because it is more environmentally friendly and has high thermal stability, but the proton conductivity is low. The Clay from Babakan Madang, which contained of SiO2 50% was expected to increase proton conductivity and improve the characteristics of the polymer membrane. Chitosan / PVA based membrane synthesis was carried out by adding clay weight variations of 0.3, 0.6 and 0.9 g. The spectra of membranes investigated by FT-IR  confirmed the presence of functional groups from chitosan/PVA/clay. Morphological analysis using SEM showed that there were granules of clay dispersed on the membrane. The determination of membran conductivity using EIS  showed the highest proton conductivity value was a membrane with the addition of 0.6 g clay, it was 6.96 x 10-7 S / cm. The membrane water swelling produced on the three membranes tended to be high, with the smallest value of 56.69% on the membrane with the addition of 0.9 grams of clay. The methanol uptake data found that the conductivity of membrane with the addition of 0.6 grams of clay was 346.11%.
PENGUJIAN PARAMETER FISIK SABUN MANDI CAIR DARI SURFAKTAN SODIUM LAURETH SULFATE (SLES) Devita Cahyaningsih; Nina Ariesta; Rizki Amelia
JURNAL SAINS NATURAL Vol. 6 No. 1 (2016): Sains Natural
Publisher : Universitas Nusa Bangsa

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (337.957 KB) | DOI: 10.31938/jsn.v6i1.250

Abstract

PHYSICAL PROPERTIES OF LIQUID SHOWER SOAP CONTAINED OF SODIUM LAURETH SULFATE (SLES) SURFACTANTSoap could be produced by saponification and neutralization process. It was contained of fatty acid, KOH, glycerin, and surfactan. The properties of surfactant determined physical properties of soap as the quality parameter of soap.  The study was conducted to examine some of the physical parameters of liquid bath soap (stability test: color, aroma, viscosity, homogeneity, viscosity and pH) in accordance with applicable standards. The study was conducted using soap which was contained of SLES surfactants (Sodium Laureth Ether Sulfate). The results were pH 8.61 and viscosity 55254 cps on stability test include oven test, cycle test, room test, and sun test.Keywords: liquid shower, Sodium Laureth Ether Sulfate, soap stability ABSTRAKSabun yang merupakan salah satu kosmetik pembersih dapat dibuat melalui dua proses, yaitu saponifikasi dan netralisasi. Sabun tersusun dari berbagai bahan, seperti asam lemak, KOH, gliserin, dan surfaktan. Sifat surfaktan dalam sabun menentukan sifat fisik dari sabun yang dihasilkan dan sebagai salah satu faktor penentu mutu. Tujuan dari penelitian ini adalah untuk menguji beberapa parameter fisik sabun mandi cair (uji stabilitas: warna, aroma, kekentalan, homogenitas, viskositas dan pH) sesuai dengan standar yang berlaku, sehingga dapat dilanjutkan ke tahap pengujian berikutnya. Penelitian ini dilakukan dengan menggunakan surfaktan SLES (Sodium Laureth Ether Sulfate). Beberapa parameter fisik terukur adalah pH 8,61 dan viskositas 55254 cps pada pengujian stabilitas meliputi oven test, cycle test, room test, dan sun test.Kata Kunci: sabun cair, Sodium Laureth Ether Sulfate, stabilitas sabun
BIJI BUAH BISBUL (Diospyros blancoi) SEBAGAI BIOSORBEN Cr(III) Nina Ariesta; Rifansyah Rifansyah; Dian Arrisujaya; Mamay Maslahat
JURNAL SAINS NATURAL Vol. 8 No. 2 (2018): Sains Natural
Publisher : Universitas Nusa Bangsa

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (719.378 KB) | DOI: 10.31938/jsn.v8i2.157

Abstract

Velvet Apple Fruit Seeds (Diospyros blancoi) as Biosorbent of Cr(III)          Velvet Apple Fruit (Diospyros blancoi) has not been explored more in Indonesia. The purpose of research was to explore the use of Velvet Apple Fruit seeds as adsobent of Cr(III) in waste. Biosorbent of velvet apple fruit seeds in removing Cr (III) metal ions has been investigated using batch method. Several parameters were used to determine absorption optimum conditions such as solution pH, contact time and biosorbent dosage. Langmuir, Freundlich and Temkin isotherm models were used in determining biosorption equilibrium. FTIR and SEM-EDX were used to characterize the velvet apple fruit seeds biosorbent. The equilibrium adsorption isotherms showed the velvet apple fruit seeds biosorbent had a maximum adsorption capacity of 5.592 mg/g. The adsorption efficiency of Cr (III) ion by velvet apple fruit seeds was 81.78%. The results showed that velvet apple fruit seeds potentially as an alternative low-cost biosorbent for removing heavy metal ions in solution.Keywords: biosorption, heavy metals, alternative biosorbent, waste water treatmentABSTRAK          Buah bisbul di Indonesia belum tereksplor dengan baik potensinya. Tujuan penelitian adalah untuk megetahui potensi biji buah Bisbul sebagai adsorben logam Cr(III) pada limbah. Biosorben biji buah bisbul (Diospyros blancoi) dalam menyerap ion logam Cr(III) telah diteliti dengan menggunakan metode batch. Beberapa parameter digunakan untuk menentukan kondisi optimum penyerapan seperti pH larutan, waktu kontak dan dosis biosorben. Model isoterm Langmuir, Freundlich dan Temkin dipakai dalam menentukan kesetimbangan biosorpsi. FTIR dan SEM-EDX digunakan dalam mengkarakterisasi biosorben biji buah bisbul. Isoterm adsorpsi kesetimbangan menunjukkan biosorben biji buah bisbul mempunyai kapasitas adsorpsi maksimum 5,592 mg/g. Efisiensi penyerapan ion Cr(III) oleh biji buah bisbul mencapai 81,78%. Hasil penelitian menunjukkan bahwa biji buah bisbul berpotensi sebagai alternatif biosorben murah dalam menghilangkan ion logam berat dalam larutan.Kata kunci: biosorpsi, logam berat, alternatif biosorben, pengolahan air limbah
Characterization of Glucomannan Extracted from Fresh Porang Tubers Using Ethanol Technical Grade Nurlela Nurlela; Nina Ariesta; Dwi Sutari Laksono; Edi Santosa; Tjahja Muhandri
Molekul Vol 16, No 1 (2021)
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (411.942 KB) | DOI: 10.20884/1.jm.2021.16.1.632

Abstract

Glucomannan is a polysaccharide consisting of β-1.4-linked D-mannose and D-glucose monomers, which have many benefits especially in the food and pharmaceutical industry. It has been widely reported that one of the main sources of glucomannan is porang tuber (Amorphophallus muelleri Blume). Generally, glucomannan extracted or purified from porang flour. However, the drying process causes other compounds than glucomannan stick strongly, resulting low levels of glucomannan. This study was to obtain glucomannan extract in an easy, effective, and inexpensive method, by direct extraction from fresh porang tubers using ethanol technical grade. We performed two extraction methods. The first is a fixed concentration method, the sample was repeatedly extracted using 50% ethanol (FC50) and 96% ethanol (FC96) 3 times, respectively. The second is a multilevel concentration method, the sample was repeatedly extracted using ethanol 60% (first step), 80% (second step), and 96% (third step), one replication each step. The highest glucomannan content (66.56%) was obtained by a multilevel concentration method. Moisture, lipid, protein, crude fiber, calcium oxalate level significantly reduce to 13.58%, 0.07%, 4.03%, 4.95%, 0.56% respectively. FTIR spectra confirmed the presence of functional groups (O-H, C=O, C-O, C-H), that compose the glucomannan compound. SEM image showed that the granules form of glucomannan were round and oval, began to change its phase from amorphous to crystalline, related to XRD data. The results showed that the direct extraction from fresh porang tuber using ethanol technical grade with a multilevel concentration method was an effective method to extract the glucomannan
Co-Authors Devita Cahyaningsih Dian Arrisujaya Dwi Ariani, Sri Retno Dwi Sutari Laksono Edi Santosa Haryono, . Mamay Maslahat Nurlela, Nurlela Rifansyah Rifansyah Rizki Amelia Thria Kharisma Tjahja Muhandri