Media Eksakta
Not a member yet
136 research outputs found
Sort by
Uji Aktivitas Antioksidan Ekstrak Etanol Daun Balaroa (Kleinhovia hospita L.) Menggunakan DPPH
Full text linkTo test the antioxidant activity of the ethanol extract of balaroa leaves (Kleinhovia hospita L) using the compound DPPH (2,2-diphenyl-1-pikrilhidrazil) as a provider of free radicals. This study aims to describe the strong, moderate or weak antioxidant activity of balaroa leaf extract. Balaroa leaf powder was extracted by maceration using absolute ethanol as a solvent. Testing the antioxidant activity of balaroa leaf extract was carried out with various concentrations of 20 ppm, 40 ppm, 60 ppm, 80 ppm, and 100 ppm. The antioxidant activity of balaroa leaf extract was analyzed using a UV-Vis spectrophotometer at a wavelength of 517 nm. The results obtained showed that the IC50 value of balaroa leaf extract was 145.211 ppm while the vitamin C reference solution was 4.909 ppm. Based on the IC50 value data, it can be determined that the ethanol extract of balaroa leaves is a moderate antioxidant.Telah dilakukan uji aktivitas antioksidan ekstrak etanol daun balaroa (Kleinhovia hospita L) menggunakan senyawa DPPH (2,2-difenil-1-pikrilhidrazil) sebagai penyedia radikal bebas. Penelitian ini bertujuan untuk mendeskripsikan aktivitas antioksidan kuat, sedang atau lemah pada ekstrak daun balaroa. Serbuk daun balaroa diekstraksi dengan cara maserasi menggunakan pelarut etanol absolut. Pengujian aktivitas antioksidan ekstrak daun balaroa dilakukan dengan variasi konsentrasi 20 ppm, 40 ppm, 60 ppm, 80 ppm, dan 100 ppm. Aktivitas antioksidan ekstrak daun balaroa dianalisis menggunakan alat spektrofotometer UV-Vis pada panjang gelombang 517 nm.Hasil penelitian yang diperoleh menunjukkan nilai IC50 ekstrak daun balaroa sebesar 145,211 ppm sedangkan larutan pembanding vitamin C sebesar 4,909 ppm
Identifikasi Pemahaman Konsep dan Self Efficacy Siswa pada Materi Struktur Atom dan Sistem Periodik Unsur
Full text linkUnderstanding the concept is a process in which students are able to understand the information obtained, both the definition, nature and description of a concept so that they are able to construct the concept. Self Efficacy is the ability of individuals to organize the actions needed for certain achievements. This study aims to (1) describe students' conceptual understanding of atomic structure material and the periodic system of elements. (2) describe student self-efficacy in atomic structure material and the periodic system of elements. The type of research used in this study was descriptive research with a quantitative approach. The instruments used in this study were three-tier questions and self-efficacy questionnaires. This research was conducted at SMAN 4 Palu in class X MIPA students. The results showed that students' understanding of concepts in atomic structure material and the periodic system of elements averaged the percentage of students who understood the concept of 34.35% classified as understanding the concept of the low category, students who did not understand the concept of 24.1% were in the low category while students who experienced a misconception of 41.35% in the sufficient category. The results of student self-efficacy research show that student self-efficacy is good because most are in the high category of 45 students (75%), the sufficient category is 15 students (25%).Pemahaman konsep adalah proses di mana siswa mampu memahami informasi yang di peroleh baik itu definisi, sifat dan uraian dari suatu konsep sehingga mampu mengkontruksi konsep tersebut. Self Efficacy adalah kemampuan individu untuk mengatur tindakan di perlukan untuk pencapaian tertentu. Penelitian ini bertujuan untuk (1)mendeskripsikan pemahaman konsep siswa pada materi struktur atom dan sistem periodik unsur.(2)mendeskripsikan self-efficacy siswa pada materi struktur atom dan sistem periodik unsur Jenis penelitian yang digunakan dalam penelitian ini adalah penelitian deskriptif dengan pendekatan kuantitatif. Instrument yang di gunakan dalam penelitian ini berupa soal three-tier dan angket self efficacy. Penelitian ini dilaksanakan di SMAN 4 Palu pada siswa kelas X MIPA. Hasil penelitian menunjukkan pemahaman konsep peserta didik pada materi struktur atom dan sistem periodik unsur rata-rata persentase siswa paham konsep sebesar 34,35% tergolong paham konsep kategori rendah, Peserta didik yang tidak paham konsep sebesar 24,1% kategori rendah sedangkan peserta didik yang mengalami miskonsepsi sebesar 41,35% kategori cukup. Hasil penelitian self efficacy siswa menunjukan bahwa self efficacy siswa baik karena kebanyakan berada di kategori tinggi sebesar 45 siswa (75%), kategori cukup sebanyak 15 siswa (25%)
Analisis kadar mineral mikro tembaga dan besi pada biji durian
Full text linkThis study aims to determine the levels of copper and iron contained in durian seeds, determine the levels of copper and iron using Atomic Absorption Spectrophotometer (AAS). The results showed that the analysis of the water content of durian seeds obtained 37.382%, ash content 17.782% and mass 44.835%. Analysis of the iron content measured at the copper wavelength of 248,3 nm, at the wavelength of 249,2, the results obtained respectively 49.244 ± 116.076 mg/100g for copper and 66.495± 15.753 mg/100g for iron. The results of this study are expected to be one of the alternative food ingredients that can be processed into food to meet the copper and iron substances in the body.This study aims to determine the levels of copper and iron contained in durian seeds, determine the levels of copper and iron using Atomic Absorption Spectrophotometer (AAS). The results showed that the analysis of the water content of durian seeds obtained 37.382%, ash content 17.782% and mass 44.835%. Analysis of the iron content measured at the copper wavelength of 248,3 nm, at the wavelength of 249,2, the results obtained respectively 49.244 ± 116.076 mg/100g for copper and 66.495± 15.753 mg/100g for iron. The results of this study are expected to be one of the alternative food ingredients that can be processed into food to meet the copper and iron substances in the body
Development of Practicum Tools for Measuring Temperature and Air Humidity Based on Microcontroller by Telemetric
Full text linkThe purpose of this research is to make a temperature measuring instrument for air temperature and humidity on the device using the DHT11 sensor as a temperature and humidity sensor for the object under study, the ATMega328P CH340G microcontroller as data processing and the Bluetooth HC-05 module as an intermediary communication between the device and a smartphone. , utilizing App Inventor technology as a means of information quickly and accurately. The research method used in this study is the research and development method or known as research and development (R&D). This measuring tool is made using the Arduino Uno R3 module, which is programmed using the Arduino programming language. Based on the results of the study, it can be concluded that: 1) The measuring instrument is designed to be able to measure temperature and humidity in a place/room continuously, 2) the system can provide precise and accurate information on the temperature and humidity of the device to the user. The additional result is that apart from practical measuring tools it can also be used as a wireless monitoring tool for temperature and humidity for swiftlet houses which is useful for solving temperature and humidity problems in swiftlet houses as well as outputs of Intellectual Property Rights Products
Aktivitas Antioksidan Pada Buah, Tepung, dan Biskuit Berbasis Labu Siam (Sechium edule)
Full text linkChayote or Sechium edule is one of Indonesia's plants and is a potential food commodity to be used as the main ingredient for product development, chayote is a plant that lives in tropical and sub-tropical areas. This study aims to determine the antioxidant content of fruit, flour and chayote biscuits using UV-Vis spectrophotometry. Analysis of the antioxidant content in this research is using the DPPH method (1,1-diphenyl-2-picrylhydrazil) as a source of free radicals. Fruit extract, flour and chayote biscuits were analyzed for their antioxidant content with various concentrations of 20 ppm, 40 ppm, 60 ppm, 80 ppm, 100 ppm. The results obtained that raw chayote fruit extract has a very weak antioxidant content with an average IC50 value of 256,723 ppm, chayote flour has a moderate antioxidant content with an average value of IC50 140,999 and chayote biscuits has a weak antioxidant content with the average value of IC50 is 179.619 ppmLabu siam atau Sechium edule merupakan salah satu tanaman Indonesia dan merupakan komoditas pangan yang potensial untuk dijadikan sebagai bahan utama pengembangan produk, labu siam merupakan tanaman yang hidup di daerah tropis dan sub tropis. Penelitian ini bertujuan untuk mengetahui kandungan antioksidan buah, tepung dan biskuit labu siam menggunakan spektrofotometri UV-Vis. Analisis kandungan antioksidan pada penelitian ini menggunakan metode DPPH (1,1-diphenyl-2-picrylhydrazil) sebagai sumber radikal bebas. Ekstrak buah, tepung dan biskuit labu siam dianalisis kandungan antioksidannya dengan variasi konsentrasi 20 ppm, 40 ppm, 60 ppm, 80 ppm, 100 ppm. Hasil yang diperoleh ekstrak buah labu siam mentah memiliki kandungan antioksidan sangat lemah dengan nilai IC50 rata-rata 256,723 ppm, tepung labu siam memiliki kandungan antioksidan sedang dengan nilai rata-rata IC50 140,999 dan biskuit labu siam memiliki kandungan antioksidan lemah dengan nilai rata-rata IC50 adalah 179,619 pp
Uji Daya Simpan Biskuit Dari Formulasi Campuran Tepung Labu Siam (Sechium Edule) dan Kacang Hijau (Vigna Radiata)
Full text linkThe study aims to determine the shelf life of biscuits from a mixture of chayote flour (Sechium edule) and mung bean (Vigna radiata) flour. The samples used in this study were biscuits made from chayote flour (Sechium edule) and Mung beans (Vignaradiata). This research was carried out in June-September 2020 which began with the manufacture of biscuits from the formulation of chayote flour and Mung beans. Data analysis for estimating the shelf life of biscuits using the Arrhenius method. The results of the research using the ASLT method. Based on the results obtained, the shelf life of biscuits from a mixture of chayote flour (Sechium edule) and Mung bean (Vignaradiata) formulation was the highest, obtained by 100% chayote flour at 25 oC for 177 days. The highest 100% Mung beans were obtained at 25 oC for 176 days. The highest 50% chayote flour and 50% Mung beans were obtained at 25 oC for 187 days. The highest 75% chayote flour and 25% Mung beans were obtained at 25 oC for 170 days. The highest 25% chayote flour and 75% mung bean were obtained at 45oC for 195 daysPenelitian bertujuan untuk mengetahui umur simpan biskuit dari campuran tepung labu siam (Sechium edule) dan tepung kacang hijau (Vigna radiata). Sampel yang digunakan dalam penelitian ini adalah biskuit yang terbuat dari tepung labu siam (Sechium edule) dan kacang hijau (Vignaradiata). Penelitian ini dilaksanakan pada bulan Juni-September 2020 yang diawali dengan pembuatan biskuit dari formulasi tepung labu siam dan kacang hijau. Analisis data untuk pendugaan umur simpan biskuit menggunakan metode Arrhenius. Hasil penelitian menggunakan metode ASLT. Berdasarkan hasil yang diperoleh, umur simpan biskuit dari campuran tepung labu siam (Sechium edule) dan formulasi kacang hijau (Vignaradiata) paling tinggi diperoleh pada tepung labu siam 100% pada suhu 25 oC selama 177 hari. Kacang hijau 100% tertinggi diperoleh pada suhu 25 oC selama 176 hari. Tepung labu siam 50% dan kacang hijau 50% tertinggi diperoleh pada suhu 25 oC selama 187 hari. Tepung labu siam 75% tertinggi dan kacang hijau 25% diperoleh pada suhu 25 oC selama 170 hari. Tepung labu siam 25% dan kacang hijau 75% tertinggi diperoleh pada suhu 45oC selama 195 hari
Pengaruh Variasi Waktu Fermentasi Terhadap Aktivitas Antioksidan Pada Minuman Kombucha Pulpa Kakao (Theobroma cacao L)
Full text linkThe purpose of this study is to determine the antioxidant activity based on the effect of fermentation variation time of cocoa pulp kombucha drink (Theobroma cacao L.). The sample used in this study is cocoa pulp obtained from yellow cocoa pods the plantation in Sibualong Village, Balaesang District, Donggala Regency. DPPH method is used to see the reduction of free radical occurs caused by antioxidant compounds in fermented cocoa pulp kombucha drink. Antioxidant activity absorbances measured by UV/Vis will be calculated by regretion equation. The value obtained from the regretion equation shows the IC50 value, if the IC50 value is below 50 ppm it indicates a very strong antioxidant activity and if the IC50 value is above 200 ppm it indicates a very weak antioxidant activity. The study show, there to effect of fermentation variation time of the antioxidant activity which is identified by the increasing of IC50. The study shows, there to effect of fermentation variation time of the antioxidant activity which is identified by the increasing of IC50, with IC¬50 values 3rd, 10th and 14th days respectively are 29,387 ppm, 322,404 ppm, and 215,298 ppm. So the best fermentation time is 3 days which shows the IC50 value less than 50 ppm so that the antioxidant activity is included in the very good category.
Tujuan penelitian ini adalah untuk mengetahui aktivitas antioksidan berdasarkan pengaruh variasi waktu fermentsi pada minuman kombucha pulpa kakao (Theobroma cacao L). Sampel yang digunakan dalam penelitian ini adalah pulpa kakao yang diperoleh dari buah kakao yang berwarna kuning dari perkebunan Desa Sibualong Kecamatan Balaesang Kabupaten Donggala. Metode DPPH digunakan untuk melihat reduksi radikal bebas yang terjadi akibat senyawa antioksidan pada minuman kombucha pulpa kakao. Absorbansi aktivitas antioksidan yang diukur dengan UV/Vis akan dihitung dengan persamaan regresi. Nilai yang diperoleh dari persamaan regresi menunjukkan nilai IC50, jika nilai IC50 di bawah 50 ppm menunjukkan aktivitas antioksidan yang sangat kuat dan jika nilai IC50 di atas 200 ppm menunjukkan aktivitas antioksidan yang sangat lemah. Hasil penelitian menunjukkan, terdapat pengaruh variasi waktu fermentasi terhadap aktivitas antioksidan yang ditandai dengan meningkatnya nilai IC50 dengan nilai IC50 hari ke 3, hari ke 10 dan hari ke 14 berturut-turut adalah 29,387 ppm, 322,404 ppm, dan 215, 298 ppm. Sehingga waktu fermentasi terbaik adalah 3 hari yang menunjukkan nilai IC50 lebih kecil dari 50 ppm sehingga aktivitas antioksidannya termasuk dalam kategori yang sangat baik. 
Magnesium, Potassium, Calcium and Phosphorus in Durian Seed Flour Food Products
Full text linkDurian seed flour can be used for the manufacture of food products such as sticks and steamed sponges. Sticks and steamed sponge cake are foods that many people like from children to adults. Durian seed flour is rich in minerals including magnesium, potassium, calcium and phosphorus. This study aims to determine the content of magnesium, potassium, calcium and phosphorus in food products from durian seed flour using Atomic Absorption Spectrophotometer (SSA) and UV-Vis Spectrophotometry. The results showed that the magnesium content in the sticks of durian seed flour with formulation 1 (0% durian seed flour) amounted to 84,053 mg/kg, formulation 2 (50% durian seed flour) amounted to 145,213 mg/kg and formulation 3 (100% durian seed flour) amounted to 142,313 mg/kg. Potassium content on sticks from durian seed flour with formulation 1 (0% durian seed flour) of 1,186 mg/kg, formulation 2 (50% durian seed flour) of 1,863 mg / kg and formulation 3 (100% durian seed flour) of 1,693 mg/kg. The calcium content in steamed sponge from durian seed flour with formulation 1 (0% durian seed flour) of 30.37 mg/kg, formulation 2 (50% durian seed flour) of 37.84 mg/kg and formulation 3 (100% durian seed flour) of 35.84 mg /kg. While the phosphorus content n steamed sponge from durian seed flour with formulation 1 (0% durian seed flour) of 17.1 mg/kg, formulation 2 (50% durian seed flour) of 27.1 mg/kg and formulation 3 (100% durian seed flour) of 24.3 mg/kg
Analisis Kesalahan Siswa SMA dalam Menyelesaikan Soal Cerita Persamaan Nilai Mutlak Berdasarkan Kriteria Watson
Full text linkThis study aims to obtain a description of the types of errors made by class X students of SMA Negeri 1 Sarudu in solving absolute value equation word problems based on Watson's criteria. This type of research is descriptive research with a qualitative approach. The subject of this research was taken by three students out of 18 students consisting of two students who made many mistakes and one who made few mistakes. The results of this study were (1) the types of errors made by subjects who made the first mistake in solving absolute value equation word problems were inappropriate procedure, and omitted conclusion. (2) the type of mistakes made by subjects who make a lot of second mistakes in solving the absolute value equation story problem is inappropriate data, undirected manipulation, and omitted conclusion. (3) the types of mistakes made by the subjects who make few mistakes in solving the absolute value equation story problem are inappropriate procedure.Penelitian ini bertujuan untuk memperoleh deskripsi tentang jenis-jenis kesalahan yang dilakukan oleh siswa kelas X SMA Negeri 1 Sarudu dalam menyelesaikan soal cerita persamaan nilai mutlak berdasarkan kriteria Watson. Jenis Penelitian ini adalah penelitian deskriptif dengan pendekatan kualitatif. Subjek penelitian ini diambil tiga siswa dari 18 siswa yang terdiri dari dua siswa yang banyak melakukan kesalahan dan yang satu yang sedikit melakukan kesalahan. Hasil penelitian ini adalah (1) jenis kesalahan yang dilakukan oleh subjek yang banyak melakukan kesalahan pertama dalam menyelesaikan soal cerita persamaan nilai mutlak adalah inappropriate procedure (prosedur tidak tepat), dan omitted conclusion (kesimpulan hilang). (2) jenis kesalahan yang dilakukan oleh subjek yang banyak melakukan kesalahan kedua dalam menyelesaikan soal cerita persamaan nilai mutlak adalah inappropriate data (data tidak tepat), undirected manipulation (manipulasi tidak langsung), dan omitted conclusion (kesimpulan hilang). (3) jenis kesalahan yang dilakukan oleh subjek yang sedikit melakukan kesalahan dalam menyelesaikan soal cerita persamaan nilai mutlak adalah inappropriate procedure (prosedur tidak tepat)
Instrumen Gaya Berpikir: Membantu Adaptasi Kognitif dalam Penyelesaian Masalah Fisika
Full text linkThis study aims to develop an instrument to measure thinking styles and their impact on cognitive adaptation in the context of physics problem solving. Understanding how individuals approach and solve physics problems can provide valuable insights into cognitive processes and strategies used. The instrument consists of various tasks designed to depict different thinking styles commonly employed in physics problem solving. These thinking styles include concrete sequential (CS), abstract sequential (AS), concrete random (CR), and abstract random (AR) thinking styles. This research follows the Research and Development (R&D) model. The development model used is the non-test instrument development model. The instrument utilizes a forced-choice model by asking respondents to determine the order of statements that best align with their condition when solving physics problems. The instrument provides four options ranging from very inappropriate to very appropriate. A total of 683 first-year students at Universitas Tadulako participated in the pilot study, and 364 in the implementation study. The expert judgment data analysis technique used the Aiken's formula. Empirical data analysis was conducted using the Ques program to test goodness of fit to the Partial Credit Model (PCM), item validity, and instrument reliability. The content validity result showed an Aiken's V value of .81, and the test reliability was .90. The average infit MNSQ value was 1.00 with a standard deviation of .18. This study found that physics education students at Universitas Tadulako tend to have an abstract sequential (AS) thinking style. The implications of these findings can be utilized to measure students' thinking style tendencies when solving physics problems.Studi ini bertujuan untuk mengembangkan instrumen untuk mengukur gaya berpikir dan dampaknya terhadap adaptasi kognitif dalam konteks penyelesaian masalah fisika. Memahami bagaimana individu mendekati dan menyelesaikan masalah fisika dapat memberikan wawasan berharga tentang proses kognitif dan strategi yang digunakan. Instrumen ini terdiri dari berbagai tugas yang dirancang untuk menggambarkan gaya berpikir yang berbeda yang umum digunakan saat menyelesaikan masalah fisika. Gaya-gaya berpikir ini meliputi sekuensial konkret (SK), gaya berpikir sekuensial abstrak (SA), gaya berpikir acak konkret (AK), dan gaya berpikir acak abstrak (AA). Penelitian ini menggunakan model Research and Development (R&D). Model pengembangan yang digunakan model pengembangan instrumen non tes. Instrumen menggunakan model force choice dengan meminta responden menentukan urutan pernyataan yang sesuai dengan kondisinya saat menyelesaikan masalah fisika. Instrumen menggunakan empat pilihan dari sangat tidak sesuai sampai dengan sangat sesuai. Sebanyak 683 mahasiswa tahun pertama di Universitas Tadulako yang berpartisipasi dalam uji coba, dan 364 pada studi implementasi. Teknik analisis data expert judgement menggunakan rumus Aiken. Analisis data empiris menggunakan program Ques untuk menguji goodness of fit to PCM, validitas item, dan reliabilitas instrument. Hasil validitas isi dengan nilai aiken’s V sebesar .81 dan reliabilitas tes sebesar .90. Nilai rata-rata infit MNSQ 1.00 dengan standar deviasi .18. Penelitian ini menemukan bahwa mahasiswa pendidikan fisika di Universitas Tadulako cenderung memiliki gaya berpikir sekuensial abstrak (SA). Implikasi terhadap temuan dapat digunakan untuk mengukur kecenderunagn gaya berpikir mahasiswa saat memecahkan masalah fisika