EduChemia最新文献

{"title":"STUDI KINETIKA DAN ISOTERM ADSORPSI BESI(III) PADA ZEOLIT ALAM DENGAN BANTUAN GELOMBANG SONIKASI","authors":"R. Alfanaar, Yuyun Yuniati, Zuri Rismiarti","doi":"10.30870/EDUCHEMIA.V2I1.1297","DOIUrl":"https://doi.org/10.30870/EDUCHEMIA.V2I1.1297","url":null,"abstract":"Abstract: Fe3+ ion is one type of heavy metal waste that is often encountered from the rest of the industrial processes and laboratory education. Adsorption using natural zeolite is one way of reducing the content of Fe3+ ions. Sonication waves can influence the adsorption process that happens. Adsorption of Fe3+ by sonication assisted natural zeolite follows 1st order kinetics base on Santosa equation with R2 value =0.928. Isothermal adsorption of this study follow Freundlich equation with R2 value = 0.948, n= 1.789 and KF = 1.832. Abstrak: Ion Fe3+ adalah salah satu jenis limbah logam berat yang sering dijumpai dari sisa proses industri dan laboratorium pendidikan. Adsorpsi menggunakan zeolit alam adalah salah satu cara mengurangi kandungan ion Fe3+.Gelombang sonikasi dapat mempengaruhi proses adsorpsi yang terjadi. Adsorpsi Fe3+ zeolit alam dengan bantuan gelombang sonikasi mengikuti kinetika orde 1 berdasarkan persamaan Santosa dengan nilai R2 = 0.928. Isoterm adsorpsi pada penelitian ini mengikuti isoterm Freundlich dengan nilai R2 = 0.948, n = 1.789, dan KF = 1.832.","PeriodicalId":55717,"journal":{"name":"EduChemia","volume":"2 1","pages":"63-72"},"PeriodicalIF":0.0,"publicationDate":"2017-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48955684","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"ANALISIS ASAM AMINO PADA MINYAK KELAPA DENGAN PROSES PENGASAMAN MENGGUNAKAN HPLC","authors":"Ima Wijayanti","doi":"10.30870/EDUCHEMIA.V2I1.1210","DOIUrl":"https://doi.org/10.30870/EDUCHEMIA.V2I1.1210","url":null,"abstract":"Abstract: Study of the success of producing coconut oil processed by acidification method based on analysis of amino acids in fatty cream using HPLC has been carried out. Purpose of this study was to determine the quality of coconut oil that is made by acidification methods to fit the SNI and APCC standard. Successful method of acidification can be seen from the types of amino acids were analyzed using HPLC instrument. Whereas, the protein content of fatty cream were analyzed by Kjeldahl method and type of amino acid that is formed using HPLC. Research results showed that the samples made of coconut oil has a FFA content of 0,36%, protein content of 21,81%, color and smell are normally. This results in accordance with the SNI standard, but still below the standard of APCC. HPLC analysis showed that the profile of amino acids formed from the sample failed and successful is different from the non-lysine and leucine in the sample that caused the high failure rate of rancidity. Abstrak: Telah dilakukan pembuatan minyak kelapa yang diproses dengan metode pengasaman melalui analisis asam amino dengan menggunakan High Performance Liquid Chromatography (HPLC). Tujuan penelitian ini adalah untuk mengetahui kualitas minyak kelapa yang dibuat dengan metode pengasaman agar sesuai dengan standar SNI dan APCC. Keberhasilan metode pengasaman dapat dilihat dari jenis asam amino yang dianalisis menggunakan HPLC dari sampel minyak yang diperoleh. Sedangkan residu dianalisis kadar proteinnya dengan metode Kjeldahl dan jenis asam amino yang terbentuk dengan menggunakan HPLC. Penelitian menunjukkan bahwa sampel minyak kelapa yang dibuat memiliki kadar FFA sebesar 0,36%, kadar protein sebesar 21,81%, warna dan bau yang normal. Hasil ini sesuai dengan standar SNI, namun masih di bawah standar APCC. Analisis HPLC menunjukkan bahwa profil asam-asam amino yang terbentuk dari sampel gagal dan berhasil adalah berbeda yaitu ketidakberadaan lisin dan leusin pada sampel gagal yang menyebabkan tingginya tingkat ketengikan.","PeriodicalId":55717,"journal":{"name":"EduChemia","volume":"2 1","pages":"40-51"},"PeriodicalIF":0.0,"publicationDate":"2017-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43434458","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"UJI AKTIVITAS ANTIBAKTERI EKSTRAK KASAR LIPID Ulva fasciata TERHADAP Bacillus cereus","authors":"Riong seulina Panjaitan, F. Madayanti","doi":"10.30870/EDUCHEMIA.V2I1.1295","DOIUrl":"https://doi.org/10.30870/EDUCHEMIA.V2I1.1295","url":null,"abstract":"Abstract: The increasing of antimicrobial resistance in medical field has become a serious problem which is have to be solved by exploring raw material on natural product. Seaweed or macroalgae is one of marine natural wealth of Indonesia’s sea. In this research, lipid extraction of seaweed (macroalgae) Ulva fasciata has been done according to Folch method by using sochlet and mixure of solvent namely chloroform:methanol (2:1/ (v/v)). The result gave two phase namely chloroform phase (0,6% (v/b)) and methanol phase (7,79% (v/b)). Furthermore, both of phase of crude extract lipid Ulva fasciata were tested their antibacterial activities against Bacillus cereus bacterial which is three times. Tetracyclin is used as positive control and the solvent (methanol-chloroform) is used as negative control. The results were both of phase gave antibacterial activity namely 0,02 mm/ μg extract for chloroform phase and 0,02 mm/ μg extract for methanol phase. Abstrak: Peningkatan kasus resistensi antimikroba pada dunia medis telah menjadi masalah yang serius sehingga perlu dilakukan pengeksplorasian bahan baku untuk antibiotik khususnya dari bahan alam. Rumput laut (makroalga) merupakan salah satu kekayaan alam hayati laut Indonesia yang memiliki kandungan lipid. Pada penelitian ini dilakukan ekstraksi lipid rumput laut (makroalga) Ulva fasciata berdasarkan metode Folch dengan menggunakan sokhlet dan campuran pelarut yang digunakan yaitu kloroform:metanol (2:1/ (v/v)). Hasil ekstraksi lipid Ulva fasciata menghasilkan dua fasa yaitu fasa kloroform sebanyak 0,6 % (v/b) dan fasa metanol sebanyak 7,79 % (v/b). Selanjutnya kedua fasa ekstrak kasar lipid Ulva fasciata tersebut diuji aktivitas antibakterinya terhadap bakteri Bacillus cereus sebanyak tiga kali pengulangan. Kontrol positif yang digunakan adalah tetrasiklin dan kontrol negatifnya adalah pelarut yaitu kloroform dan metanol. Hasil penelitian menunjukkan bahwa kedua fasa tersebut memberikan aktivitas antibakteri sebesar 0,02 mm/ μg ekstrak untuk fasa klorofrom dan 0,08 mm/ μg ekstrak untuk fasa metanol.","PeriodicalId":55717,"journal":{"name":"EduChemia","volume":"2 1","pages":"14-24"},"PeriodicalIF":0.0,"publicationDate":"2017-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47592913","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"ANALISIS SOAL INTERNATIONAL JUNIOR OLYMPIADE (IJSO) SAINS (KIMIA) BERDASARKAN DIMENSI PROSES KOGNITIF DAN PENGETAHUAN","authors":"Y. Yunita","doi":"10.30870/EDUCHEMIA.V2I1.1207","DOIUrl":"https://doi.org/10.30870/EDUCHEMIA.V2I1.1207","url":null,"abstract":"Abstract: This study aimed to describe the composition of the dimension of the cognitive process based on Bloom's Taxonomy revision questions from IJSO chemical Nigeria 2010, analyzing the mapping dimension of cognitive processes and dimensions of knowledge on the IJSO chemical concept in Nigeria 2010, and describes mapping of IJSO chemical question in Nigeria 2010 by senior high school competences. The method of research conducted qualitative descriptive. The technique begins with the completion of the stages do matter, then categorize into one of the six cognitive dimensions and four dimensions of knowledge. Problem is analyzed in this study of IJSO (Chemistry) Nigeria in 2010 with details of 10 Multiple Choice questions, Theoretical Test in the form of discourse, and 12 questions of Experiment Test. Based on the analysis, findings, and the discussion in this study, the composition of the dimension of the revised Bloom's taxonomy of cognitive processes considering the aspect (C1) 2.94%, to understand (C2) of 5.88%, apply (C3) 44.12), analyzing 32 , 35%, judging (C5) 14.71%, and creates 0%, while mapping the dimensions of cognitive processes and dimensions of 8.82% factual knowledge, conceptual knowledge and procedural knowledge 44.11% amounting to 47.06%. Based on analysis of the details of conformity competency in senior high school as follows, as much as 38.24% of the material in class X, XI A total of 50.00%, while 11.76% of class XII. Abstrak: Peneltian ini bertujuan untuk mendeskripsikan komposisi dimensi proses kognitif Taksonomi Bloom revisi soal-soal IJSO kimia Nigeria 2010, menganalisis pemetaan dimensi proses kognitif dan dimensi pengetahuan pada soal IJSO kimia Nigeria 2010, dan mendeskripsikan pemetaan soal-soal IJSO kimia Nigeria tahun 2010 berdasarkan SK/KD SMA/MA. Metoda penelitian yang dilakukan deskriptif kualitatif. Teknik yang dilakukan diawali dengan penyelesaian tahapan soal, kemudian diklompokkan kedalam salah satu dari enam dimensi kognitif dan empat dimensi pengetahuan. Soal yang di analisis pada penelitian ini dari IJSO (Kimia) Nigeria tahun 2010 dengan rincian Multiple Choice 10 soal, Theoritical Test dalam bentuk wacana, dan Exprerimental Test 12 soal. Soal-soal tersebut sama dengan silabus di Indonesia sesuai kurikulum KTSP tingkat SMA. Berdasarkan hasil analisis data, temuan, dan pembahasan pada penelitian ini, komposisi dimensi proses kognitif taksonomi Bloom revisi aspek mengingat (C1) 2,94%, memahami (C2) 5,88%, mengaplikasi (C3) 44,12), menganalisa 32,35%, menilai (C5) 14,71%, dan mencipta 0%, sedangkan pemetaan dimensi proses kognitif dan dimensi pengetahuan faktual 8,82%, pengetahuan konseptual 44,11% dan pengetahuan prosedural sebesar 47,06%. Berdasarkan hasil analisis rincian kesesuaian SK/KD SMA sebagai berikut, sebanyak 38,24 % materi kelas X, Sebanyak 50,00% kelas XI, sedangkan kelas XII sebesar 11,76%.","PeriodicalId":55717,"journal":{"name":"EduChemia","volume":"2 1","pages":"1-13"},"PeriodicalIF":0.0,"publicationDate":"2017-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42743737","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"PENERAPAN MODEL PEMBELAJARAN TEAMS GAMES TOURNAMENTS (TGT) PADA MATERI REDOKS UNTUK MENINGKATKAN MOTIVASI BELAJAR SISWA","authors":"R. Hiliasih, Evi Sapinatul Bahriah, Robby Zidny","doi":"10.30870/educhemia.v2i1.1209","DOIUrl":"https://doi.org/10.30870/educhemia.v2i1.1209","url":null,"abstract":"Abstract: This study aims to increase students' motivation through cooperative learning model type Teams Games Tournament (TGT) on the redox material. The method used is classroom action research with two cycles. Samples were 10 grade students of SMAN 5 Tangerang City. Data collection techniques gained through an essay test instruments and motivation questionnaire. Data were analyzed student motivation questionnaire average value in the description and essay tests were analyzed by calculating the value of N-Gain (%). The results showed that: (1) the average value of students' motivation to learn chemistry after participating TGT cooperative learning both in the first cycle and the second cycle were increased, 73.53 (medium category) and 79.44 (high category) respectively. (2) The percentage of the average value of the N-Gain (%) in the first cycle is at 69.53 (medium category). While on the second cycle percentage of the average value of the N-Gain (%) amounted to 79.72 (high category). (3) The percentage of students who achieve the minimum criteria of mastery learning (KKM )in the first cycle of 65.79% and the second cycle of 78.95%. This shows that the cooperative learning model type Teams Games Tournament (TGT) can increase learning motivation and mastery of the concept dvof redox chemistry students. Abstrak: Penelitian ini bertujuan untuk meningkatkan motivasi belajar siswa melalui model pembelajaran kooperatif tipe Teams Games Tournament (TGT) pada materi redoks. Metode yang digunakan dalam penelitian ini adalah penelitian tindakan kelas dengan 2 siklus. Sampel penelitian adalah siswa kelas X SMAN 5 Kota Tangerang Selatan. Teknik pengumpulan data diperoleh melalui instrumen tes esai dan angket motivasi. Data hasil angket motivasi siswa dianalisis nilai rata-ratanya secara deskripsi dan tes esai dianalisis dengan cara menghitung nilai N-Gain (%). Hasil penelitian menunjukkan bahwa: (1) nilai rata-rata motivasi belajar kimia siswa dengan menggunakan model Teams Games Tournament (TGT) mengalami peningkatan baik pada siklus I maupun pada siklus II. Nilai rata-rata motivasi belajar siswa pada siklus I adalah sebesar 73,53 (kategori sedang) sedangkan pada siklus II sebesar 79,44 (kategori tinggi). (2) Persentase nilai rata-rata N-Gain (%) pada siklus I adalah sebesar 69,53 (kategori sedang), sedangkan pada siklus II persentase nilai rata-rata N-Gain (%) adalah sebesar 79,72 (kategori tinggi). (3) Persentase jumlah siswa yang mencapai nilai Kriteria Kelulusan Minimal (KKM) pada siklus I sebesar 65,79% dan pada siklus II sebesar 78,95%. Hal ini menunjukkan bahwa model pembelajaran kooperatif tipe Teams Games Tournament (TGT) dapat meningkatkan motivasi belajar dan penguasaan konsep redoks kimia siswa.","PeriodicalId":55717,"journal":{"name":"EduChemia","volume":"2 1","pages":"25-39"},"PeriodicalIF":0.0,"publicationDate":"2017-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46749457","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}