@thesis{thesis,
		author={Fatma  Nurjayanti},
		title ={PENETAPAN KADAR KUERSETIN DALAM
JUS BUAH JAMBU BIJI MERAH (Psidium guajava Linn.)
SECARA SPEKTROFOTOMETRI UV – Vis},
		year={2021},
		url={http://librepo.stikesnas.ac.id/521/},
		abstract={Red guava fruit (Psidium guajava Linn.) is one of the types of plants that
is easily found in various places. Red guava fruit (Psidium guajava Linn.)
contains a quercetin which can be used to boost the immune system. The purpose
of this research was to determine the quercetin levels in the juice red guava
(Psidium guajava Linn.) by spectrophotometry UV-Vis. Initial identification of
quercetin compounds was carried out by color testing using NaOH 10% , H2SO4,
Mg and HCl reagents and Thin Layer Chromatography (TLC) test. The
identification results showed that red guava fruit juice (Psidium guajava Linn.)
was positive for quercetin. Quercetin levels in red guava fruit juice (Psidium
guajava Linn.) was analized by spectrophotometry UV-Vis at a maximum
wavelength of 371.5 nm. Quercetin levels in the sample that was 52,9976 mg /
100 g of juice.}
		}