English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Tannin is a compound of polyphenols derived from plants found in tea leaves (Camellia sinensis). Generally, the tannins are separated from the tea leaves using conventional methods of solvent extraction. Unfortunately, the said method resulted in an unsatisfactory yield because High risk of degradation of compounds, so it needs to carry out another way to overcome this matter, namely the ultrasonic solvent extraction method. This research aims to learn the effect of ultrasonic on the increase of tannins yield of extraction and to searched constant kinetic. This research has studied some of the parameters that affect the ultrasonic extraction result. These include the effect of extraction time and the type of tea leaves used from three different altitude areas from the sea level, such as Ciwidey Bandung, Pagar Alam, and Bogor Peak. The extraction time used is 4, 6, and 8 hours where the ultrasonic frequency at 75 kHz with a 70% ethanol solvent. Products containing tannins are analyzed qualitatively and quantitatively. Qualitative tannins content is tested with FeCl3 and Gelatin, while quantitative analysis uses spectrophotometer UV-vis Shimadzu UV 1800. Besides that, the Scanning Electron Microscopy (SEM) characterization confirmed that the ultrasonic method effect on increasing yield. The highest result is on the type of Pagar Alam tea at 8 hours extraction time, 23.1% of yield, which is 1% higher than the conventional method. The constant kinetic of ultrasonic extraction tea from Bandung was 0,0567 kg/m.h. Abstrak Tanin merupakan senyawa polifenol yang berasal dari tumbuhan yang terdapat pada daun teh (Camellia sinensis). Umumnya tanin dipisahkan dari daun teh menggunakan ekstraksi pelarut. Sayangnya metode tersebut memberikan hasil yang kurang memuaskan karena beresiko tinggi terdegradasi, sehingga perlu dilakukan cara lain untuk mengatasi hal tersebut yaitu dengan metode ekstraksi ultrasonik. Penelitian ini bertujuan untuk mempelajari pengaruh ultrasonik terhadap peningkatan yield tanin hasil ekstraksi dan mencari kontanta kinetika. Parameter yang diamati pada penelitian ini diantaranya waktu ekstraksi dan jenis daun teh yang digunakan dari tiga daerah dengan ketinggian dari permukaan laut yang berbeda, yaitu Ciwidey Bandung, Pagar Alam, dan Puncak Bogor. Variasi waktu ekstraksi yang digunakan adalah 4, 6, dan 8 jam dimana frekuensi ultrasonik pada 75 kHz dengan pelarut ethanol 70%. Produk yang mengandung tanin dianalisis secara kualitatif dan kuantitatif. Kadar tanin secara kualitatif diuji menggunakan FeCl3 dan Gelatin sedangkan analisis kuantitatif menggunakan spektrofotometer UV-vis Shimadzu UV 1800. Selain itu, karakterisasi Scanning Electron Microscopy (SEM) memberikan validasi bahwa metode ultrasonik berpengaruh terhadap peningkatan rendemen tanin. Hasil tertinggi diperoleh pada teh jenis Pagar Alam dengan waktu ekstraksi 8 jam, yaitu 23,1% yield dimana lebih tinggi 1% dibandingkan dengan metode konvensional. Konstanta kinetika ekstraksi ultrasonic teh dari bandung sebesar was 0,0567 kg/m.h.

Tannins Extraction of Tea Leaves by Ultrasonic Method: Comparison with The Conventional Method