2 research outputs found

    PENGARUH PENAMBAHANUBI JALAR UNGU (Ipomoea batatas L) TERHADAP AKTIVITAS ANTIOKSIDAN DAN SIFAT ORGANOLEPTIK PADA ES KRIM

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    Es krim ubi jalar ungu merupakan makanan fungsional yang bermanfaat bagi kesehatan, aman, dan menyenangkan untuk dikonsumsi. Ubi jalar ungu mengandung antosianin yang betindak sebagai antioksidan dan pewarna alami, juga memiliki kandungan pati yang dapat mempengaruhi tekstur dari es krim tersebut.Penelitian ini bertujuan untuk mengetahui pengaruh penambahan ubi jalar ungu (Ipomoea batatas L) terhadap aktivitas antioksidan dan sifat organoleptik.Es krim ubi jalar ungu dibuat melalui kombinasi proses pembekuan bahan-bahan yang terdiri dari susu, kuning telur, gula, whipped cream dan ubi jalar ungu sebagai substituen. Es krim ubi jalar ungu dibuat dengan berbagai formulasi perbandingan massa ubi jalar ungu dan adonan utama es krim, yaitu 0:10 (kontrol); 1:9; 2:8; 3:7 dan 4:6. Kadar antioksidan dan total antosianin ekstrak metanol ubi jalar ungu dan es krim dicari dengan menggunakan metode spektrofotometri. Uji organoleptik dilakukan terhadap 20 panelis tidak terlatih dengan atribut uji warna, rasa, tekstur dan sensasi di mulut (mouthfeel). Hasil penelitian menunjukan bahwa semakin banyak ubi jalar ungu yang ditambahkan pada es krim semakin meningkat aktivitas antioksidan dantotal antosianinnya. Formulasi es krim yang disukai panelis untuk warna adalah 4:6, untuk rasa 1:9, sedangkan untuk tekstur dan sensasi di mulut (mouthfeel) 3:7. Berdasarkan hasil uji statistik diketahui bahwa formulasi berpengaruh nyata terhadap warna, rasa, tekstur dan mouthfeel pada taraf kepercayaan 95% (P=0,05)

    Electrochemical degradation of methylene blue using Ce(Iv) ionic mediator in the presence of Ag(I) ion catalyst for environmental remediation

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    Methylene blue (MB) is often used in textile industries and is actively present in the wastewater runs-off. Recently, mediated electrochemical oxidation (MEO) offers a fast, reliable and promising results for environmental remediation. Thus, we aimed to evaluate the electro-degradation potential of MB by MEO using Ce(IV) ionic mediator. Furthermore, we also observed the influence of addition Ag(I) ion catalyst in MEO for degradation of MB. The electro-degradation of MB was evaluated by cyclic voltammetry technique and was confirmed by UV-Vis spectrophotometry, high performance liquid chromatography (HPLC) analysis and back-titration analysis. The results showed that in the absence of Ag(I) ion catalyst, about 89 % of MB was decolorized within 30 min. When 2 mM of Ag(I) ion catalyst was applied, the electro-degradation of MB was increased to maximum value of 100%. The UV-Vis spectrum confirmed the electro-degradation of MB as suggested by decreased maximum absorbance value at λ 668 nm from 2.125 to 0.059. The HPLC analysis showed the formation of five new peaks at retention time of 1.331, 1.495, 1.757, 1.908, and 2.017 min, confirming the electro-degradation of MB. The back-titration analysis showed about 52.9% of CO2 was produced during electro-degradation of MB by MEO. More importantly, more than 97% of Ce(IV) ionic mediator were recovered in our investigation. Our results showed the potential of MEO using Ce(IV) ionic mediator to improve the wastewater runs-off quality from textile as well as other industries containing methylene blue
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