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VALIDASI METODE PENENTUAN CEMARAN MELAMIN DALAM SUSU FORMULA MENGGUNAKAN HIGH PERFORMANCE LIQUID CHROMATOGRAPHY HITACHI D 7000 Zebua, Dian Novita; Fatimah, Soja Siti; Suhanda, Hokcu
Jurnal Sains dan Teknologi Kimia Vol 4, No 1 (2013): Jurnal Sains dan Teknologi Kimia
Publisher : Program Studi Kimia Jurusan Pendidikan Kimia FPMIPA UPI

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Abstract

Pada tahun 2008 ditemukan adanya susu formula yang terkontaminasi senyawa melamin. Melamin dan asam sianurat akan diserap oleh saluran pencernaan dalam tubuh dan mengendap di ginjal membentuk kristal. Sehingga sangat diperlukan adanya suatu metode yang handal, cepat, mudah, dan murah untuk menganalisis cemaran melamin dalam susu formula. Sementara itu metode baku untuk analisis melamin belum ditetapkan dalam Standar Nasional Indonesia. Penelitian ini bertujuan untuk menguji validitas metode analisis cemaran melamin dalam susu formula bayi menggunakan High Performance Liquid Chromatography (HPLC) Hitachi D-7000 dan fase gerak 0,1%TFA:metanol dengan mempertimbangkan lima parameter uji yaitu linearitas, batas deteksi (LOD), batas kuantisasi (LOQ), presisi, dan akurasi. Kondisi analisis kromatografi diperoleh pada komposisi fase gerak 0,1% TFA (pH 2,8):metanol (50:50) dan laju alir 0,75 mL/menit. Pengendapan protein susu pada sampel diperoleh pada penambahan 2 mL asam trikloroasetat 5%. Koefisien korelasi (r) 0,9999 menunjukkan linearitas yang diperoleh mendekati 1. Deteksi melamin yang relatif kecil ditunjukkan dengan LOD dan LOQ berturut-turut 0,76 ppm dan 2,5 ppm. Metode analisis ini juga menghasilkan presisi dengan uji repetabilitas yang baik ≤ 2% yaitu RSD 1,13%. Akurasi dihasilkan berdasarkan uji perolehan kembali sebesar 100,7-119,8% dengan batas keberterimaan sebesar 80-120%. Dengan demikian, telah diperoleh metode yang valid untuk menganalisis cemaran melamin dalam susu formula menggunakan HPLC Hitachi D-7000 sehingga metode tersebut dapat digunakan untuk keperluan analisis secara rutin. Kata kunci: melamin, validasi metode, susu formula, HPLC, TFA
Pengembangan Metode Penentuan Kadar Natrium Benzoat Secara Spektrofotometri UV dalam Jamur Kancing Kemasan Plastik Sevita, Vivi; Suhanda, Hokcu; -, Zackiyah
Jurnal Sains dan Teknologi Kimia Vol 4, No 2 (2013): Jurnal Sains dan Teknologi Kimia
Publisher : Program Studi Kimia Jurusan Pendidikan Kimia FPMIPA UPI

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Abstract

Penentuan kadar natrium benzoat menurut Association of Official Analytical Chemist (AOAC) 960.38 dan 980.17 dilakukan secara spektofotometri UV. Pada kedua prosedur, konsentrasi natrium benzoat ditentukan berdasarkan pengukuran asam benzoat yang dikali dengan faktor konversi (1,18). Tahap pembuatan deret standar asam benzoat pada AOAC 980.17 dan isolasi asam benzoat dalam sampel pada AOAC 960.38 rumit dan membutuhkan banyak pereaksi sehingga dilakukan modifikasi metode pada penelitian ini. Pengembangan dilakukan melalui pembuatan deret standar untuk kurva kalibrasi sesuai AOAC 960.38 dengan mengganti  pelarut  dietil  eter  menjadi  kloroform,  sedangkan  isolasi  dilakukan sesuai   AOAC   980.17   dengan   mengganti   pelarut   petroleum   eter   menjadi kloroform. Dilakukan uji validasi menggunakan standar asam benzoat dan sampel jamur kancing kemasan plastik yang mengandung natrium benzoat. Hasil uji validasi  menunjukkan linieritas (r) = 0,9997 dengan persamaan regresi y=0,0077 + 0,0030 pada konsentrasi 30 – 100 ppm; batas deteksi sebesar 2,5791 ppm; batas kuantitasi sebesar 7,8156 ppm; presisi dengan nilai %RSD sebesar 4,00%; rata – rata uji pungut ulang terhadap larutan natrium benzoat 10 ppm, 40 ppm dan 60 ppm  sebesar  99,97%;  99,02%;  98,68%.  Diperoleh  kadar  rata  –  rata  natrium benzoat  dalam  sampel  jamur  kancing  kemasan  plastik  dari  metode  ini  yaitu sebesar 0,4502 g/kg.Kata kunci: Jamur Kancing Kemasan Plastik; Natrium Benzoat; Spektrofotometri UV; Validasi Metode.
PENENTUAN KADAR OKSIGEN TERLARUT MENGGUNAKAN SENSOR POLAROGRAFI BERMEMBRAN PLASTIK (Determination of dissolved oxygen with polarographic oxygen sensor plastic membrane probe) Suhanda, Hokcu
Jurnal Pengajaran Matematika dan Ilmu Pengetahuan Alam Vol 2, No 2 (2001): Jurnal Pengajaran MIPA
Publisher : Faculty of Mathematics and Science Education, Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18269/jpmipa.v2i2.397

Abstract

Plastic membrane sensor for polarographic oxygen measurement has been investigated. The Probe was constructed of: Pt as a working electrode; Ag- AgCl as a reference electrode and an auxiliary electrode; solution of KCl as an electrolyte solution; plastic wrap (thickness 72.7  m) as a membrane; and polyester polymer as a body of sensor. It was found that the polarographic oxygen sensor plastic membrane probe was suited for determination of dissolved oxygen with an optimum operating characteristics at applied voltage of  –0.65 V and solution KCl 30% as an electrolyte. The probe showed that reduction current achieved steady state after 75 seconds. The standard calibration curve (concentration – current) showed that the linear relationships were achieved for dissolved oxygen in the range of 1.0 – 30.6 ppm. The analytical performance characteristics of the probe were: precision 0.87% – 30.0 %; calibration sensitivity 0.17 ppm/  A; analytical sensitivity 0.56 – 0.84 ppm/  A; and detection limit 0.8 ppm. The t- test and F-test at 95% confidence level showed that there was no significant difference between the determinations of dissolved oxygen by polarographic oxygen sensor membrane plastic and by Winkler method. Key words: membrane plastic, polarographic, steady state, Winkler method.
PENENTUAN KADAR OKSIGEN TERLARUT MENGGUNAKAN SENSOR POLAROGRAFI BERMEMBRAN PLASTIK (Determination of dissolved oxygen with polarographic oxygen sensor plastic membrane probe) Suhanda, Hokcu
Jurnal Pengajaran MIPA Vol 2, No 2 (2001): JPMIPA: Volume 2, Issue 2, 2001
Publisher : Faculty of Mathematics and Science Education, Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18269/jpmipa.v2i2.34920

Abstract

Plastic membrane sensor for polarographic oxygen measurement has been investigated. The Probe was constructed of: Pt as a working electrode; Ag-AgCl as a reference electrode and an auxiliary electrode; solution of KCl as an electrolyte solution; plastic wrap (thickness 72.7 mm) as a membrane; and polyester polymer as a body of sensor. It was found that the polarographic oxygen sensor plastic membrane probe was suited for determination of dissolved oxygen with an optimum operating characteristics at applied voltage of  –0.65 V and solution KCl 30% as an electrolyte. The probe showed that reduction current achieved steady state after 75 seconds. The standard calibration curve (concentration – current) showed that the linear relationships were achieved for dissolved oxygen in the range of 1.0 – 30.6 ppm.The analytical performance characteristics of the probe were: precision 0.87% – 30.0 %; calibration sensitivity 0.17 ppm/mA; analytical sensitivity 0.56 – 0.84 ppm/mA; and detection limit 0.8 ppm. The t- test and F-test at 95% confidence level showed that there was no significant difference between the determinations of dissolved oxygen by polarographic oxygen sensor membrane plastic and by Winkler method.
DEVELOPMENT OF INSTRUMENT FOR HIGH SCHOOL STUDENTS' READING LITERACY AND NUMERATION ON THERMOCHEMICAL MATERIAL Siswaningsih, Wiwi; Rahmawati, Triannisa; Salsabila, Audria; Zahira, Alfina Dzabillah; Nahadi, Nahadi; Suhanda, Hokcu; Mora, Abraham; Lee, Won Koo
Lantanida Journal Vol 12, No 1 (2024)
Publisher : UIN AR-RANIRY

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22373/lj.v12i1.23427

Abstract

The aim of this research is to produce a minimum competency assessment instrument (MCA) on thermochemical material that meets the test criteria that is suitable for measuring students' reading literacy and numeracy in terms of validity, reliability, level of difficulty and distinguishing power. The research design used is a development and validation design. The participants involved in this research were high school students at one of the high schools in Bandung City as respondents and validators consisting of 3 lecturers and 2 teachers in their fields. The product resulting from this research is the MCA test instrument on thermochemical material which consists of 5 reading literacy questions and 15 numeracy questions. This test instrument was declared valid based on content validity and based on empirical validity, 16 questions were valid and 4 questions were invalid. The reliability test results showed that the reliability value for the objective questions was 0.73, while the reliability value for the description questions was 0.77 and both were declared reliable. The results of the MCA instrument competency level analysis show that students' reading literacy and numeracy competencies are included in the basic category and require special intervention with a refractive index of 1.53 and 1.00.
Analysis of Student's Interest and Motivation in Learning Chemistry Through Chemistry for Fun Demonstration at SMAN 1 Pangandaran [Analisis Minat dan Motivasi Belajar Siswa terhadap Pelajaran Kimia Melalui Demonstrasi Kimia Berbasis Chemistry for Fun di SMAN 1 Pangandaran] Fatimah, Soja Siti; Nuraini, Vidia Afina; Gumilar, Gun Gun; Khoerunnisa, Fitri; Suhanda, Hokcu; Kusrijadi, Ali; Hana, Muhamad Nurul
Jurnal Pengabdian Isola Vol 1, No 2 (2022): JPI: VOLUME 1, ISSUE 2, 2022
Publisher : Universitas Pendidikan Indonesia (UPI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/jpi.v1i2.47517

Abstract

Masa pandemi Covid-19 yang telah berlangsung selama hampir dua tahun menyebabkan siswa kehilangan kesempatan untuk melakukan kegiatan laboratorium. Kondisi tersebut menjadikan pembelajaran kimia lebih bersifat teoritis. Hal ini menjadi salah satu penyebab rendahnya minat dan motivasi siswa untuk mempelajari kimia yang pada akhrinya dapat berimbas pada rendahnya hasil belajar siswa. Oleh karena itu, kegiatan pengabdian kepada masyarakat ini dilakukan untuk mengetahui minat, motivasi, dan tanggapan para siswa terhadap pelajaran kimia melalui demonstrasi berbasis chemistry for fun. Sebanyak 12 judul percobaan kimia sederhana didemonstrasikan terhadap 54 siswa kelas X-XII di SMAN 1 Pangandaran. Pengumpulan data dilakukan dengan angket tanggapan para siswa terkait keterlaksanaan demonstrasi kimia berbasis chemistry for fun serta minat dan motivasi belajar siswa terhadap pelajaran kimia. Hasil analisis menunjukkan bahwa para siswa memberikan tanggapan positif terhadap demosntrasi kimia berbasis chemistry for fun dengan tingkat keterlaksanaan sangat baik. Selain itu, tingkat minat dan motivasi belajar siswa terhadap pelajaran kimia masing-masing berada pada kategori tinggi dengan presentase 64,8% dan 70,4%. Dengan demikian, demonstrasi kimia berbasis chemistry for fun dapat menjadi alternatif metode pembelajaran untuk meningkatkan minat dan motivasi belajar siswa terhadap pelajaran kimia.Chemistry teachers are required to have four competencies which include pedagogic, personality, social and professional competencies. Some of the teacher's limitations that have been identified are weak literacy and critical thinking skills, which causes chemistry learning to be more theoretical. This is one of the causes of the low interest and motivation of students to study chemistry. To overcome this, it is necessary to conduct workshop and deepen the material for teachers, so that teachers are expected to become more confident in presenting chemistry lessons that are interesting and relevant to everyday life. The workshop was carried out by adopting a Problem-based Learning (PBL) learning model to provide experience for teachers as facilitators that stimulates students in chemistry learning. Thermochemistry topic was chosen because it is a good stimulus in solving problems in everyday phenomena through chemical knowledge. Through this workshop, outputs are produced in the form of curriculum analysis and learning strategies for thermochemical materials that are ready to be applied by teachers.
EFEKTIVITAS FLIPBOOK NANOTEKNOLOGI BERBASIS ETNOSAINS TERINTEGRASI AUGMENTED REALITY DALAM MENDUKUNG PROGRAM SDGs UNTUK SISWA SMA Ezha, Sephianti Dwika; Nurjanah, Desi Fauza; Amalia, Vina Nurul; Ramaulita, Thara Nabila; Nursyahbana, Galih Lazuardi; Rohman, Ijang; Suhanda, Hokcu; Rahmawati, Triannisa
Lantanida Journal Vol 12, No 2 (2024)
Publisher : UIN AR-RANIRY

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22373/lj.v12i2.26542

Abstract

A flipbook with augmented reality based on ethnoscience, supported by Heyzine and Assembler, contains nanotechnology content for high school students. It is an interactive learning media in the form of an electronic book that contains photos, text, and animated content designed to assist students in learning the material through the visuals offered. Page flipping has a transition effect that helps students read each page and increases their learning use. Applied visual arts ethnoscience exemplifies the combination of community culture and science. Augmented reality is utilized to show objects in 3D and realistically related to the ethnoscience of applied fine arts in the Cirebon area, such as the scissor-grip home, megamendung batik, ceramics, masks, kujang, and paintings. The goal of this research is to develop digital teaching materials that can adjust to evolving technologies in order to increase educational quality. The data was collected using a quasi-experimental one-group pretest-posttest design for a total of 30 students, which was then processed using the ADDIE model (Analysis, Design, Development, Implementation, and Evaluation) using descriptive statistics. This study found that students had good perceptions of the presence of a flipbook media with AR based on ethnoscience. Ethnoscience-based digital learning media can be used as interactive learning media because they provide precise visualizations of the concepts and conditions encountered during the learning process.
Workshop On Small-Scale Distillation for Chemistry Teachers to Support the Implementation of Education for Sustainable Development in Banten Province [Workshop Destilasi Skala Kecil bagi Guru Kimia untuk Mendukung Implementasi Education for Sustainable Development di Provinsi Banten] Oktiani, Rosi; Liliasari, Liliasari; Siswaningsih, Wiwi; Rahmawati, Triannisa; Suhanda, Hokcu; Mubarokah, Febriati Dian; Rifa, Hasna Athaya
Jurnal Pengabdian Isola Vol 4, No 1 (2025): JPI: VOLUME 4, ISSUE 1, 2025
Publisher : Universitas Pendidikan Indonesia (UPI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/jpi.v4i1.83542

Abstract

Implementasi Education for Sustainable Development (ESD) di sekolah, perlu didukung dengan kompetensi guru dalam mengintegrasikan pendekatan ESD melalui pembelajaran. Kegiatan pengabdian kepada masyarakat ini bertujuan memberikan pengetahuan dan keterampilan baru bagi guru kimia di Provinsi Banten dalam mengimplementasikan ESD melalui eksperimen kimia skala kecil. Kegiatan ini dilakukan dengan metode workshop isolasi minyak sereh wangi melalui destilasi uap menggunakan small-scale kit. Evaluasi keberhasilan kegiatan workshop ini dilakukan menggunakan kuesioner respon guru terhadap kegiatan workshop yang telah dilakukan. Kegiatan workshop telah berhasil meningkatkan pengetahuan dan keterampilan guru dalam menggunakan small-scale kit untuk mengurangi penggunakan bahan kimia pada pembelajaran kimia berbasis eksperimen. Hal ini dapat mendukung implementasi ESD dalam pembelajaran kimia di sekolah, khususnya di Provinsi Banten.Implementing Education for Sustainable Development (ESD) in schools requires teachers to be competent in integrating the ESD approach into their teaching. This community service initiative aims to equip chemistry teachers in Banten Province with new knowledge and skills for implementing ESD through small-scale chemistry laboratory activity. This activity was conducted using a workshop method to isolate citronella oil through steam distillation with a small-scale kit. To evaluate the success of the workshop, participants completed a questionnaire assessing their experience. Through this activity, teachers succeeded in gaining new knowledge and skills in using small-scale kits to reduce the use of chemicals in laboratory activity-based chemistry learning. This program supports the implementation of ESD in chemistry education in schools throughout Banten Province.
DEVELOPMENT OF INSTRUMENT FOR HIGH SCHOOL STUDENTS' READING LITERACY AND NUMERATION ON THERMOCHEMICAL MATERIAL Siswaningsih, Wiwi; Rahmawati, Triannisa; Salsabila, Audria; Zahira, Alfina Dzabillah; Nahadi, Nahadi; Suhanda, Hokcu; Mora, Abraham; Lee, Won Koo
Lantanida Journal Vol 12 No 1 (2024)
Publisher : UIN AR-RANIRY

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22373/lj.v12i1.23427

Abstract

The aim of this research is to produce a minimum competency assessment instrument (MCA) on thermochemical material that meets the test criteria that is suitable for measuring students' reading literacy and numeracy in terms of validity, reliability, level of difficulty and distinguishing power. The research design used is a development and validation design. The participants involved in this research were high school students at one of the high schools in Bandung City as respondents and validators consisting of 3 lecturers and 2 teachers in their fields. The product resulting from this research is the MCA test instrument on thermochemical material which consists of 5 reading literacy questions and 15 numeracy questions. This test instrument was declared valid based on content validity and based on empirical validity, 16 questions were valid and 4 questions were invalid. The reliability test results showed that the reliability value for the objective questions was 0.73, while the reliability value for the description questions was 0.77 and both were declared reliable. The results of the MCA instrument competency level analysis show that students' reading literacy and numeracy competencies are included in the basic category and require special intervention with a refractive index of 1.53 and 1.00.
EFEKTIVITAS FLIPBOOK NANOTEKNOLOGI BERBASIS ETNOSAINS TERINTEGRASI AUGMENTED REALITY DALAM MENDUKUNG PROGRAM SDGs UNTUK SISWA SMA Ezha, Sephianti Dwika; Nurjanah, Desi Fauza; Amalia, Vina Nurul; Ramaulita, Thara Nabila; Nursyahbana, Galih Lazuardi; Rohman, Ijang; Suhanda, Hokcu; Rahmawati, Triannisa
Lantanida Journal Vol 12 No 2 (2024)
Publisher : UIN AR-RANIRY

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22373/lj.v12i2.26542

Abstract

A flipbook with augmented reality based on ethnoscience, supported by Heyzine and Assembler, contains nanotechnology content for high school students. It is an interactive learning media in the form of an electronic book that contains photos, text, and animated content designed to assist students in learning the material through the visuals offered. Page flipping has a transition effect that helps students read each page and increases their learning use. Applied visual arts ethnoscience exemplifies the combination of community culture and science. Augmented reality is utilized to show objects in 3D and realistically related to the ethnoscience of applied fine arts in the Cirebon area, such as the scissor-grip home, megamendung batik, ceramics, masks, kujang, and paintings. The goal of this research is to develop digital teaching materials that can adjust to evolving technologies in order to increase educational quality. The data was collected using a quasi-experimental one-group pretest-posttest design for a total of 30 students, which was then processed using the ADDIE model (Analysis, Design, Development, Implementation, and Evaluation) using descriptive statistics. This study found that students had good perceptions of the presence of a flipbook media with AR based on ethnoscience. Ethnoscience-based digital learning media can be used as interactive learning media because they provide precise visualizations of the concepts and conditions encountered during the learning process.
Co-Authors Ali Kusrijadi Amalia, Vina Nurul Dian Novita Zebua Ezha, Sephianti Dwika Fitri Khoerunnisa Gun Gun Gumilar Ijang Rohman Lee, Won Koo Liliasari , Mora, Abraham Mubarokah, Febriati Dian Muhamad Nurul Hana Nahadi Nuraini, Vidia Afina Nurjanah, Desi Fauza Nursyahbana, Galih Lazuardi Ramaulita, Thara Nabila Rifa, Hasna Athaya Rosi Oktiani Salsabila, Audria Soja Siti Fatimah Triannisa Rahmawati, Triannisa Vivi Sevita Wiwi Siswaningsih Zackiyah, Zackiyah Zahira, Alfina Dzabillah