Pengaruh Frekuensi Bunyi Audiosonik Terhadap Bakteri Asam Laktat Pada Proses Fermentasi Yogurt

Aissyyah, Fiqih (2023) Pengaruh Frekuensi Bunyi Audiosonik Terhadap Bakteri Asam Laktat Pada Proses Fermentasi Yogurt. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Yogurt merupakan salah satu produk olahan susu yang difermentasi dengan penambahan bakteri tertentu sehingga menghasilkan rasa dan bau asam yang khas. Fermentasi yogurt umunya berlangsung selama 14-16 jam. Lamanya waktu proses fermentasi dapat dipersingkat jika kandungan asam laktat semakin meningkat. Meningkatnya kandungan asam laktat disebabkan oleh aktivitas Bakteri Asam Laktat (BAL) dalam mengubah laktosa. Sehingga, untuk mengendalikan aktivitas metabolisme sel dan pertumbuhan bakteri dapat dilakukan dengan diberi perlakuan parameter seperti suhu, frekuensi bunyi, frekuensi cahaya, atau bahkan dengan penambahan bakteri tertentu. Pada penelitian ini digunakan parameter frekuensi bunyi audiosonik pada yogurt saat proses fermentasi berlangsung. Penelitian dilakukan dengan tujuan untuk mengetahui pengaruh perlakuan frekuensi bunyi audiosonik pada BAL sehingga dapat mempercepat proses fermentasi yogurt. Selain itu, penelitian ini bertujuan untuk menentukan nilai frekuensi yang berpengaruh pada BAL saat proses fermentasi. Penelitian dilakukan dengan dua variasi perlakuan, yaitu yogurt tanpa paparan frekuensi bunyi, dan yogurt dengan paparan frekuensi bunyi variasi 2000 Hz, 5000 Hz, 7500 Hz, 8000 Hz, dan 8500 Hz. Berdasarkan pengukuran pH yogurt hingga mencapai nilai pH acuannya, waktu fermentasi yogurt tanpa paparan frekuensi adalah 865 menit, dan waktu fermentasi yogurt dengan paparan frekuensi 2000 Hz, 5000 Hz, 7500 Hz, 8000 Hz, dan 8500 Hz secara berturut-turut adalah 885 menit, 830 menit, 695 menit, 605 menit dan 730 menit. Didapatkan hasil bahwa tidak semua frekuensi yang diberikan pada bakteri asam laktat memengaruhi aktivitas metabolisme dan pertumbuhannya. Namun, pemberian frekuensi yang sesuai dapat memengaruhi aktivitas pertumbuhan bakteri. Pada penelitian ini, dapat disimpulkan bahwa frekuensi bunyi 8000 Hz dapat mempercepat waktu proses fermentasi, dengan waktu fermentasi selama 605 menit dan pH akhir yogurt 4,4, serta laju penurunan pH sebesar 0,18pH/jam.
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Yoghurt is a dairy product that is fermented with the addition of certain bacteria to produce a distinctive taste and smell. Yogurt fermentation generally lasts for 14-16 hours. The length of the fermentation process can be shortened if the lactic acid content increases. The increase in lactic acid content is due to the activity of Lactic Acid Bacteria (LAB) in converting lactose. Thus, to control cell metabolic activity and bacterial growth, parameters such as temperature, sound frequency, light frequency, or even the addition of certain bacteria can be treated. In this study, the audiosonic sound frequency parameter was used on yogurt during the fermentation process. The research was conducted to determine the effect of audiosonic sound frequency treatment on LAB to accelerate the yogurt fermentation process. In addition, this study aims to determine the frequency value that affects LAB during the fermentation process. The research was conducted with two treatment variations, namely yogurt without frequency exposure, and yogurt with exposure to sound frequency variations of 2000 Hz, 5000 Hz, 7500 Hz, 8000 Hz, and 8500 Hz. Based on measuring the pH of the yoghurt until it reaches the set point pH, the yoghurt fermentation time without sound frequency exposure is 865 minutes and yogurt fermentation time with frequency exposure of 2000 Hz, 5000 Hz, 7500 Hz, 8000 Hz, and 8500 Hz were 885 minutes, 830 minutes, were 695 minutes, 605 minutes, and 730 minutes, respectively. It was found that not all frequencies given to lactic acid bacteria affected their metabolic activity and growth. However, giving the appropriate frequency can affect the growth activity of bacteria. In this study, it can be concluded that the sound frequency of 8000 Hz can accelerate the fermentation process time, with a fermentation time of 605 minutes and the final pH of yogurt 4.4, and a rate of pH decrease of 0.18 pH/hour.

Item Type: Thesis (Other)
Uncontrolled Keywords: Audiosonic, Fermentation, Sound Frequency, Speaker, Yoghurt, Audiosonik, Fermentasi, Frekuensi Bunyi, Speaker, Yogurt.
Subjects: Q Science
Q Science > QC Physics
Divisions: Faculty of Science and Data Analytics (SCIENTICS) > Physics > 45201-(S1) Undergraduate Thesis
Depositing User: Fiqih Aissyyah
Date Deposited: 28 Aug 2023 06:12
Last Modified: 28 Aug 2023 06:12
URI: http://repository.its.ac.id/id/eprint/103378

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