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Hasil Pencarian

Ditemukan 3 dokumen yang sesuai dengan query
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Simatupang, Felly Rihlat Gibran
"Minyak atsiri merupakan senyawa penting dalam bahan alam, yang memiliki banyak khasiat bagi kesehatan manusia. Minyak atsiri dapat diambil dari bahan alam dengan proses ekstraksi. Salah satu proses ekstraksi yang sedang menjadi tren penelitian adalah ekstraksi ultrasonik, yang dinilai memiliki banyak keunggulan, seperti kemudahan operasi, energi yang relatif rendah, dan operasi pada temperatur rendah yang dapat menjaga stabilitas senyawa biokimia dalam bunga telang. Salah satu kebaruan dalam penelitian ini adalah adanya penambahan mekanisme probe yang bergerak secara oksilasi, memungkinkan sumber gelombang ultrasonik menjadi dinamis. Selain itu, juga ditambahkan variasi intensitas ultrasonik sebagai parameter optimasi universal dalam ekstraksi ultrasonik. Adapun metode yang digunakan dalam analisis adalah metode kuantitatif dengan pengukuran data-data temperatur dan perhitungan fraksi massa minyak atsiri sebagai representasi kuantitas minyak atsiri, metode kualitatif dengan analisis visual perubahan warna emulsi dan distribusi temperatur terhadap waktu, serta metode analitik dengan perhitungan kinetik proses ekstraksi ultrasonik, untuk mengetahui nilai yield, yang direpresentasikan oleh kuantitas senyawa phenolic dengan perhitungan konstanta Peleg. Hasil penelitian menunjukkan bahwa, dengan penambahan probe oksilasi, dapat menyeragamkan distribusi temperatur dan ikatan antara pelarut dan senyawa biokimia dalam bahan alam, atau dengan kata lain, meningkatkan kualitas minyak atsiri yang dihasilkan. Di sisi lain, intensitas ultrasonik yang semakin tinggi dapat meningkatkan volume minyak atsiri yang dihasilkan, yang direpsentasikan fraksi massa minyak atsiri dan analisis kinetik yield terhadap waktu, serta meningkatkan laju ekstraksi yang terlihat dari analisis kinetik dan perubahan warna emulsi terhadap waktu. Hal ini disebabkan karena intensitas ultrasonik meningkatkan efek sonokemistri, kavitasi, turbulensi dan tegangan geser yang meningkatkan kuantitas dan laju ekstraksi. Hal penting yang harus diperhatikan dalam optimasi proses ekstraksi ultrasonik adalah turbulensi yang terlalu tinggi dapat menyebabkan agitasi dan temperatur yang terlalu tinggi dapat berpotensi merusak senyawa biokimia aktif dalam bunga telang.

Essential oil is an important compound in natural substances, which has many benefits for human health. Essential oil can be produced from natural substances through the process of extraction. One of the trending extraction processes is ultrasonic extraction, which is considered to have many advantages, including, ease of operation, relatively low energi consumption, and capability to operate at low temperature which keep stabilitizing biochemical compounds inside natural substances, which in this research used butterfly pea flower (Clitoria Ternatea L). The novelty of this research was the application of a mechanism of osscilating moving probe, enabling ultrasonic wave source to be dynamic. Additionally, varieties of ultrasonic intensities was also applied as an universal parameter in optimizing the process of ultrasonic extraction. The methods used in the research were quantitative methods by measuring data of temperatures and calculating essential oil mass fraction, as representatives of essential oil quantity, qualitative methods by visual analysis of emulsion color evolution and temperature distribution through time, as well as analytical method by calculating the kinetics of ultrasonic extraction process, to determine yield, represented by phenolic compound quantity with Peleg’s constant calculation. The results of the research showed that oscilating probe addition could evenly distribute temperature and enhanced the bonds between solvent and biochemical compounds inside the natural substances, in other words, improving the quality of essential oil produced. On the other hand, a rise in ultrasonic intensities could increase essential oil volume produced, which was represented by essential oil mass fraction and kinetic analysis of yield through time, as well as increasing the extraction rate, as shown in kinetic analysis and emulsion color evolution. This was due to higher ultrasonic intensities enhanced sonochemistry effect, cavitation, turbulence and shear stress which increased essential oil quantity and the rate of extraction process. The important issues that needed to be considered in optimizing ultrasonic extraction process was over turbulence which could cause agitation and overhigh temperature which potentially could damage the active biochemical compounds inside butterlfy pea flower as a natural susbtance."
Depok: Fakultas Teknik Universitas Indonesia, 2022
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UI - Tesis Membership  Universitas Indonesia Library
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Siti Maryani
Fakultas Kedokteran Universitas Indonesia, 1994
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UI - Tesis Membership  Universitas Indonesia Library
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"His 2nd edition of the Practical Guide to Emergency Ultrasound addresses your need for a practical, comprehensive, how-to book on ultrasound techniques in the emergency department, including new and expanded applications. Organized in an easy-to-navigate problem-based and symptom-based approach, chapters cover many uses for ultrasound in the ED and proper ultrasound technique. Over 900 images, many in full color, illustrate key concepts and diagnoses, including the use of echocardiography in the ED and newer applications for imaging ocular, musculoskeletal injuries and the use of ultrasound in the management of undifferentiated hypotension and dyspnea. Chapters on newer applications of ultrasound including thoracic, inferior vena cava, musculoskeletal, and ocular imaging; newer and evolving applications for procedural guidance, including nerve blocks; new and highlighted content for Pediatric applications; and chapters on prehospital use, and use in resource-limited settings. Entire section focusing on Ultrasound use in the Resuscitation of Acute Injury or Illness. Over 900 images demonstrate key diagnoses and proper ultrasound technique. Over 175 online video clips that display more realistic three-dimensional views. More than 60 additional online-only images for several chapters."
Philadelphia: Wolters Kluwer, 2014
616.07 PRA
Buku Teks  Universitas Indonesia Library