CD Skripsi

Identjfikasi Degradasi Kualitas Yoghurt-Dadffi Berdasarkan Pengukuran Nilai Impedansi

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Yoghurt-curd is a fermented milk product that is favoured by people in the Kampar area. The quality of the curd depends on the number of bacteria and changes in the pH value. The addition of preservatives can increase the storage time of curd, but reduce the quality of the curd itself. This study aims to determine the quality degradation of the curd using the impedance measurement method. Changes in curd quality were also observed based on organoleptic test including taste, scent, texture and colour for 7 days of measurement. The current-voltage measurement used an electronic circuit with an excitation voltage source from the Multi I/O Card PCI 6221 based on LabVIEW software. The measurement frequency was ranging from 10 Hz to 50 kHz and the voltage amplitude variations are 50 mV, 100 mV, and 150 mV. The values of real and imaginary impedance, and phase angle are obtained by injecting alternating current using platinum into the curd. The impedance value measurement of 100 mV voltage from day 1 to day 7 increased from 9007.1Ω to 29490.8 Ω. The imaginary value measurement using the time variation show that the imaginary value decreases relatively to time. The imaginary impedance value is negative for the capacitive sample. Phase angle measurement obtained were -73.3˚ on the 1st day and -61.2˚ on the 7th day. The relationship between curd impedance and organoleptic test results was classified using the ANOVA method. Based on the results of the analysis, it can be seen that the curd degradation relation is directly proportional to the impedance value which increases according to the measurement time.
Key words : Curd, Impedance, Real, Imaginary, Phase angle, ANOVA, pH test, Organoleptic test

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Ketersediaan

Informasi Detail

Judul Seri

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No. Panggil

1803124189

Penerbit

Pekanbaru : Universitas Riau –FMIPA– FISIKA., 2022

Deskripsi Fisik

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Bahasa

Indonesia

ISBN/ISSN

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Klasifikasi

1803124189

Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

FISIKA

Info Detail Spesifik

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Pernyataan Tanggungjawab

nadya

Versi lain/terkait

Lampiran Berkas

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