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Penentuan Kadar Asam Lemak Bebas Dan Kadar Air Pada Minyak Goreng Yang Digunakan Oleh Pedagang Gorengan Di Jalan Manyar Sabrangan, Mulyorejo, Surabaya Ika Fitri Ulfindrayani; Qurrota A’yuni
Journal Pharmasci (Journal of Pharmacy and Science) Vol. 3 No. 2 (2018): Journal Pharmasci (Journal of Pharmacy and Science)
Publisher : Akademi Farmasi Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53342/pharmasci.v3i2.111

Abstract

ABSTRAK Kebutuhan minyak goreng sawit di Indonesia terus meningkat dari tahun ke tahun. Kebutuhan terbesar didominasi oleh penggunaan minyak goreng sawit sebagai media untuk menggoreng makanan yang salah satunya yaitu jajanan goreng (gorengan). Mayoritas pedagang gorengan tidak memperhatikan kualitas dari minyak goreng yang digunakan. Banyak pedagang gorengan membeli minyak goreng bekas (jelantah) demi mendapatkan keuntungan yang besar. Pada minyak jelantah mengandung asam lemak bebas akibat pemanasan berkala yang berbahaya bagi tubuh. Oleh karena itu, pada penelitian ini dilakukan pengujian kualitas minyak goreng melalui dua parameter yaitu kadar asam lemak bebas dan kadar air. Hal ini bertujuan untuk mengetahui kualitas minyak goreng yang digunakan oleh para pedagang gorengan. Sampel minyak goreng didapatkan dari pedagang gorengan di sepanjang Jalan Manyar Sabrangan, Mulyorejo, Surabaya. Terdapat 7 pedagang gorengan yang menjual gorengannya dengan harga sekitar Rp. 1.000 – Rp 2.000. Metode yang digunakan yaitu metode titrasi alkalimetri dan metode gravimeteri. Hasil analisa kadar asam lemak bebas dan kadar air menunjukkan bahwa dari 7 sampel terdapat 4 sampel minyak goreng yang tidak layak dikonsumsi karena tidak sesuai dengan syarat mutu minyak goreng SNI 01-3741-2002. Kata kunci: Asam Lemak Bebas, Kadar Air, Minyak Goreng, Pedagang Gorengan. ABSTRACT The requirement of palm cooking oil in Indonesia increase from year to year. It was dominated by the use of palm cooking oil as a medium to fry. Fried food on street seller was one of foods that need oil in frying process. Many street fried food seller did not pay attention to the quality of cooking oil that used to fry. Waste cooking oil was the good choice for street fried food seller in order to get big profits. Waste cooking oil contains of free fatty acids due to periodic warming that is harmful to the body. It was important for us to know the quality of cooking oil which we used. Therefore, in this research, we did test the quality of cooking oil which used street fried food seller. Free fatty acid and water content were two parameters that can describe the quality of cooking oil. The samples of cooking oil were obtained from street fried food seller along Jalan Manyar Sabrangan, Mulyorejo, Surabaya. There are 7 street seller that selling fried food with price of about Rp. 1.000 - Rp 2.000. Alkalimetry titration and gravimetery method were used to determine free fatty acid and water content of samples. The result showed there are 4 samples of cooking oil that was not worthy to be consumed because not in accordance with requirement of cooking oil quality of SNI 01-3741-2002. Key Words: Free Fatty Acid, Water Content, Cooking Oil, Street Fried Food Seller.
Sintesis Sol-Gel dan Karakterisasi Struktur Padatan FeF3 dengan Difraksi Sinar-X Qurrota A’yuni; Trisna Kumala Dhaniswara
Journal Pharmasci (Journal of Pharmacy and Science) Vol. 4 No. 1 (2019): Journal Pharmasci (Journal of Pharmacy and Science)
Publisher : Akademi Farmasi Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53342/pharmasci.v4i1.127

Abstract

ABSTRAKMaterial FeF3 dapat diaplikasikan dalam berbagai bidang diantaranya sebagai material katoda untuk baterai ion litium dan katalis heterogen pada beberapa reaksi yang melibatkan sisi asam. Sintesis FeF3 dapat dilakukan melalui beberapa cara, salah satunya dengan metode sol-gel. Di dalam proses sol-gel adanya agen gelasi dapat mengontrol porositas dan sifat keasaman katalis. Pada penelitian ini dipilih agen gelasi dari senyawa alkohol yaitu metanol dan etanol. Masing-masing padatan yang telah disintesis kemudian dikarakterisasi struktur padatannya dengan difraksi sinar-X. Hasil penelitian menunjukkan bahwa padatan FeF3 telah berhasil disintesis melalui metode sol gel dengan agen gelasi yang berbeda yaitu metanol dan etanol yang masing-masing dituliskan sebagai FeF3(me) dan FeF3(et). Karakterisasi struktur padatan FeF3 menggunakan difraksi sinar-X menghasilkan difraktogram yang sesuai dengan PDF No. 85-0481 dan data ICSD kode 016671 yang memilikistruktur rhombohedral dengan space group R-3cR dan panjang kisi kristal sebesar a = b = c = 5,362 Å dengan sudut α = β = γ = 57,99°. Struktur kristal FeF3 disusun oleh ion Fe3+ dengan jari-jari 0,384 Å dan ion F- dengan jari-jari 0,798 Å dengan tipe ikatan ionik. Rasio besarnya kristalinitas FeF3(et) dibandingkan dengan kristalinitasFeF3(me) sebesar 5:4.Kata kunci: FeF3, sintesis sol-gel, difraksi sinar-X, struktur padatan. ABSTRACTFeF3 material can be applied in various fields including as cathode material for lithium ion batteries and heterogeneous catalysts in some reactions involving the acid side. Synthesis of FeF3 can be done in several ways, one of them is the sol-gel method. In the sol-gel process the gelation agent can control the porosity and acidity of the catalyst. In this study, gelation agents were selected from alcohol compounds, namely methanol and ethanol. The solids that has been synthesized was then solid structure characterized by X-ray diffraction. The results showed that FeF3 solids were successfully synthesized through the sol-gel method with different gelation agents, namely methanol and ethanol, each of which was written as FeF3(me) and FeF3(et). Characterization of the solid structure of FeF3 using X-ray diffraction produces a diffractogram according to the PDF No. 85-0481 and ICSD data code 016671 which has a rhombohedral structure with space group R-3cR andcrystal lattice length of a = b = c = 5.362 Å with an angle α = β = γ = 57.99°. The crystal structure of FeF3 is composed by Fe3+ ions with radius 0.384 Å and F- ions with radius 0.798 Å with ionic bond types. The ratio of the crystallinity of FeF3(et) compared to the crystallinity of FeF3(me) is 5:4.Keywords: FeF3, sol-gel synthesis, X-ray diffraction, solid structur.