@thesis{thesis,
		author={Agita  Indra Siwi},
		title ={ANALISIS KADAR TANIN
PADA REBUSAN DAUN SIRIH (Piper betle L.)
MENGGUNAKAN METODE SPEKTROFOTOMETRI UV-Vis},
		year={2022},
		url={http://librepo.stikesnas.ac.id/855/},
		abstract={One of the plants that can be used for traditional medicine is betel leaf (Piper
betle L.). The part of the betel leaf plant that is used as traditional medicine is the
leaves by boiling or dikinang. Betel leaf contains tannins which act as antibacterial.
The purpose of this study was to determine the levels of tannins in the betel leaf
stew using the UV-Vis spectrophotometry method and to determine the type of
tannin in the betel leaf stew. This research was conducted on green betel leaf.
Extraction of tannins from betel leaf samples was carried out by boiling. In the
determination of the tannin test using FeCl31% reagent and gelatin, positive results
were obtained containing tannins. Betel leaf decoction is included in the type of
hydrolyzed tannins. The tannin levels in the betel leaf stew were determined using
the UV-Vis spectrophotometric method with the reagents used were folin ciocalteu
and sodium carbonate so that in the presence of tannins it would form a
molybdenum-tungsten blue complex. The absorbance was measured after a stable
reaction time was reached at 92 minutes with a maximum wavelength of 767 nm.
The tannin content obtained in the betel leaf stew was 0.279±0.001% GAE with a
coefficient of variation of 0.3579%.}
		}