Aldevira, Chyka Viona (2019) PENETAPAN KADAR FORMALIN PADA TAHU PUTIH YANG DIJUAL DI PASAR TRADISIONAL MOJOSONGO SECARA SPEKTROFOTOMETRI UV-VIS. Karya Tulis Ilmiah thesis, Universitas Setia Budi Surakarta.
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Abstract
The used of formaldehyde as a preservative in food that has been banned and regulated in minister of health regulation number 33 of 2012.Many found the use of formaldehyde in tofu as a preservative in the community. Then it is necessary to do qualitative and quantitative analysis of the formaldehyde content in white tofu sold in the Mojosongo traditional market by Uv-Vis spectrophotometry. The study was conducted on samples taken randomly from 3 traders at the Mojosongo traditional market. The tofu samples was carried out qualitative test with chromatophoric acid reagent which will form purple if there is formaldehyde and quantitative test by Uv-Vis spectrophotometry. The validation of the method used is precision, accuracy, linearity, LOD and LOQ. Formalin levels were calculated by linear regression analysis with the equation Y = a + b X. The results of the qualitative test with chromatophoric acid didn’t show a distinctive purple colour changed. Quantitative test were carried out by Uv-Vis spectrophotometry with a maximum wavelength of 589 nm and operating time 7-9 minute. The method validation shows that linearity with the value r = 0,99352 and the equation Y = - 0,21295 + 0,028234 X, LOD= 2,0906 ppm, LOQ= 6,3352 ppm, accuracy withrecovery = 98,73% andprecision with RSD value = 0,000918%.The study shows that from three tofu samples, one sample contained formalin with a level 0,0816% b/b ± 0,000666. Key words : white tofu, formaldehyde, chromatophoric acid, Uv – Vis spectrophotometry
| Item Type: | Thesis (Karya Tulis Ilmiah) |
|---|---|
| Uncontrolled Keywords: | white tofu, formaldehyde, chromatophoric acid, Uv – Vis spectrophotometry. |
| Subjects: | R Medicine > RS Pharmacy and materia medica |
| Divisions: | Fakultas Farmasi > Prodi D3 Farmasi |
| Depositing User: | Mrs NOVI HANDAYANI |
| Date Deposited: | 06 Nov 2019 07:41 |
| Last Modified: | 06 Nov 2019 07:41 |
| URI: | http://repo.setiabudi.ac.id/id/eprint/3730 |
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