Listiyaningtias, Listiyaningtias (2022) PENGARUH PADA WAKTU DAN KONSENTRASI ETANOL TERHADAP EKTRAKSI TEH HITAM BERBANTU ULTRASONIK. Skripsi thesis, Universitas Muhammadiyah Sukabumi.

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Abstract

Black tea is one of the most popular beverage ingredients in Indonesia. Black tea contains alkaloid compounds is caffeine, the caffeine content is quite high and plays a role in determining the quality of black tea. Conventional extraction methods (soaking, boiling, reflux) have a weakness that is susceptible to damage to phenolic compounds due to oxidation, hydrolysis and ionization reactions during extraction. Therefore, in this study, the extraction of black tea products was carried out using an ultrasonic-assisted extraction method to avoid spoilage. This study aims to perform ultrasonic-assisted black tea extraction at different extraction times and ethanol concentrations to provide the highest caffeine yield and content in black tea extract products. Black tea products were extracted by ultrasonic bath at 40 kHz with variations in extraction time (25, 35, 45 minutes) and solvent concentration of ethanol (50%, 60%, 70%). The test parameters included total yield, ash content and caffeine content. The results showed that the optimal condition for ultrasonic-assisted black tea extraction was ethanol concentration of 70 with caffeine content of 233.95 mg/L and 12.99% yield. The optimal extraction time variable to obtain high caffeine content was 222.25 mg/L and the yield was 13.57% with 45 minutes. The ash content produced by varying the ethanol concentration with 70% ethanol concentration was 0.65% w/w and for 5 minutes the ash content was 0.61% w/w. The value of the total ash content that meets the requirements of the Indonesian Pharmacopoeia does not exceed 5.6%.

Item Type:	Thesis (Skripsi)
Uncontrolled Keywords:	black tea, caffeine, ultrasonic, extraction time, ethanol concentration
Subjects:	Q Science > Q Science (General) Q Science > QD Chemistry
Divisions:	Fakultas Sains dan Teknologi > Kimia
Depositing User:	Perpus ID UMMI
Date Deposited:	16 Feb 2023 08:23
Last Modified:	16 Feb 2023 08:23
URI:	http://eprints.ummi.ac.id/id/eprint/3025

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