Zendrato, Fanni Kristiyanti (2013) PENGEMBANGAN SENSOR KIMIA UNTUK PENENTUAN PENGAWET FORMALDEHIDA DI DALAM MAKANAN DAN MINUMAN. Undergraduate thesis, UNIMED.
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Abstract
Penelitian ini bertujuan untuk mengembangkan sensor kimia dengan deteksi spektofotometri yang memiliki daya analisis sensitif, selektif, dan hasil analisisnya akurat. Prinsip analisisnya berdasarkan reaksi kondensasi formaldehida dengan sistem aromatik dari asam kromatropat, membentuk senyawa berwarna 3,4,5,6-dibenzoxanthylium. Untuk mendapatkan hasil yang akurat dalam analisis pengawet formaldehida dengan metode spektrofotometri dilakukan prosedur optimasi yaitu penentuan pH optimum, penentuan linieritas kurva kalibrasi, dan pengaruh senyawa pengganggu terhadap pergeseran panjang gelombang. Kondisi percobaan yang optimum adalah pada larutan buffer pH 6, panjang gelombang maksimum 565,09 nm, dan dari kurva kalibrasi diperoleh persamaan regresi linear y = 0.113x + 0.067, dengan harga R2 = 0.995. Zat-zat penggangu tidak terlalu memberikan pengaruh terhadap pengukuran formaldehida. Dari hasil pengukuran diketahui bahwa seluruh sampel makanan yang dianalisis menggandung formaldehida dengan kadar yang berbeda-beda, kadar formaldehida tertinggi terdapat pada sampel Burger Ayam berkode F yaitu kadarnya sebesar 1.5686 mg/g, sementara kadar formaldehida terendah yaitu pada sampel ikan asin perak-perak berkode M yaitu sebesar 0.0324 mg/g. Metode Spektrofotometri sensitif dan akurat dalam pengukuran kadar formaldehida dengan linieritas pengukuran 0,2
Item Type: | Thesis (Undergraduate) | ||||||
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Call Number: | 540 Fan p | ||||||
Keywords: | Sensor Kimia; Pengawet; Formaldehida; Spektrofotometri Visibel. | ||||||
Subjects: | Q Science > QD Chemistry Q Science > QD Chemistry > QD71 Analytical chemistry |
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Divisions: | Fakultas Matematika dan Ilmu Pengetahuan Alam > Kimia | ||||||
Depositing User: | Mrs Fitri Sry Juliati Sinaga | ||||||
Date Deposited: | 08 Apr 2016 08:34 | ||||||
URI: | http://digilib.unimed.ac.id/id/eprint/12519 |
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