dc.contributor.advisor | Marianne | |
dc.contributor.author | Anggreni, Trisni Utari | |
dc.date.accessioned | 2020-10-12T04:45:05Z | |
dc.date.available | 2020-10-12T04:45:05Z | |
dc.date.issued | 2020 | |
dc.identifier.uri | http://repositori.usu.ac.id/handle/123456789/28598 | |
dc.description.abstract | Latar Belakang: Teh merupakan salah satu bahan minuman alami yang sangat
populer di masyarakat. Teh mengandung antioksidan dimana komponen bioaktif
yang berperan sebagai antioksidan disebut dengan polifenol. Polifenol dalam
tanaman terdiri atas flavonoid dan asam fenolat. Salah satu teh yang memiliki
kandungan polifenol tertinggi adalah teh putih.
Tujuan: Penelitian ini bertujuan untuk mengetahui kadar total fenol, total
flavonoid serta aktivitas antioksidan seduhan teh putih dari Solok Selatan.
Metode: Penelitian ini dilakukan secara eksperimental meliputi penyiapan
sampel, skrining fitokimia, karakterisasi simplisia, serta pembuatan seduhan teh
putih dengan suhu penyeduhan 70oC dan waktu penyeduhan 5 menit. Penetapan
kadar total fenol dilakukan dengan menggunakan metode Folin-Ciocalteu dengan
asam galat sebagai pembanding dan penetapan kadar total flavonoid dilakukan
menggunakan metode kolorimetri dengan pereaksi AlCl3 dan digunakan kuersetin
sebagai pembanding. Pengujian aktivitas antioksidan seduhan teh putih dilakukan
menggunakan metode pemerangkapan radikal bebas DPPH (1,1-diphenyl-2-
picrylhydrazil) dengan kuersetin sebagai pembanding yang diukur menggunakan
spektrofotometer UV-Visibel.
Hasil: Kadar total fenol yang diperoleh yaitu 20,007 mg GAE/g sampel yang
artinya total fenol 1 gram seduhan teh putih setara dengan 20,007 mg asam galat.
Kadar total flavonoid yang diperoleh yaitu 0,886 mg QE/g sampel yang artinya
total flavonoid 1 gram seduhan teh putih setara dengan 0,886 mg kuersetin, dan
nilai IC50 yang diperoleh dari uji antioksidan yaitu 73,711 μg/ml yang artinya
aktivitas antioksidan pada seduhan teh putih termasuk dalam kategori kuat.
Kesimpulan: Kadar total fenol yang diperoleh yaitu 20,007 mg GAE/g sampel.
Kadar total flavonoid yang diperoleh yaitu 0,886 mg QE/g sampel. Nilai IC50
yang diperoleh yaitu 73,711 μg/ml. | en_US |
dc.description.abstract | Background: Tea is one of the natural beverage ingredients that is very popular
in the community. Tea contains antioxidants where the bioactive components that
act as antioxidants are called polyphenols. Polyphenols in plants consist of
flavonoids and phenolic acids. One of the teas that has the highest polyphenol
content is white tea.
Objective: The aim of this research was determine the total levels of phenols and
total flavonoids of white tea steeping and test the antioxidant activity of white tea
steeping from Solok Selatan.
Method: This research was conducted experimentally, including sample
preparation, phytochemical screening, characterization of simplicia, as well as
making white tea steeping with 70oC brewing temperature and 5 minutes brewing
time. Determination of total phenol levels was carried out using the Folin-
Ciocalteu method with gallic acid as a comparison standard and determination of
total flavonoid levels was carried out using the colorimetric method with AlCl3
reagent and quercetin used as a comparison standard. The antioxidant activity of
white tea steeping was carried out using DPPH (1,1-diphenyl-2-picrylhydrazil)
free radical scavenging method with quercetin as a comparison standard measured
using UV-Visible spectrophotometer.
Results: Total phenol content obtained was 20.007 mg GAE/g sample which
means that every gram of steeping white tea is equivalent to 20.007 mg gallic
acid, the total flavonoid level obtained was 0.886 mg QE/g sample which means
each gram of steeping white tea equivalent to 0.886 mg quercetin, and the IC50
value obtained from the antioxidant test is 73.711 μg/ml which means the
antioxidant activity in steeping white tea is included in the strong category.
Conclusion: Total phenol content obtained was 20.007 mg GAE/g sample. Total
flavonoid levels obtained were 0.886 mg QE/g sample. The IC50 value obtained
was 73.711 μg/ml. | en_US |
dc.language.iso | id | en_US |
dc.publisher | Universitas Sumatera Utara | en_US |
dc.subject | Antioksidan | en_US |
dc.subject | DPPH | en_US |
dc.subject | IC50 | en_US |
dc.subject | Seduhan | en_US |
dc.subject | Teh Putih | en_US |
dc.subject | Total Fenol | en_US |
dc.subject | Total Flavonoid | en_US |
dc.title | Penetapan Aktivitas Antioksidan dengan Metode Total Fenol dan Total Flavonoid dari Seduhan Teh Putih (Camellia sinensis (L.) Kuntze) | en_US |
dc.type | Thesis | en_US |
dc.identifier.nim | NIM161501062 | |
dc.description.pages | 97 Halaman | en_US |
dc.description.type | Tesis Magister | en_US |