EKSTRAKSI BUBUK KOPI ARABIKA (Coffea Arabica L.) UNTUK MENGETAHUI KADAR FLAVONOID DENGAN MENGGUNAKAN SPEKTROFOTOMETER VISIBEL GENESYS 20 (Arabica Coffe Powder ‘Coffea Arabica L.’ Extraction to Determine Levels of Flavonoids by Using Visible Spectrophotometer Genesys 20)

SAGALA, ANDREAS (2015) EKSTRAKSI BUBUK KOPI ARABIKA (Coffea Arabica L.) UNTUK MENGETAHUI KADAR FLAVONOID DENGAN MENGGUNAKAN SPEKTROFOTOMETER VISIBEL GENESYS 20 (Arabica Coffe Powder ‘Coffea Arabica L.’ Extraction to Determine Levels of Flavonoids by Using Visible Spectrophotometer Genesys 20). Undergraduate thesis, Undip.

[img]
Preview
PDF (COVER) - Published Version
51Kb
[img]
Preview
PDF (HALAMAN PENGESAHAN) - Published Version
95Kb
[img]
Preview
PDF (DAFTAR ISI) - Published Version
232Kb
[img]
Preview
PDF (BAB I) - Published Version
88Kb
[img]
Preview
PDF (BAB II) - Published Version
700Kb
[img]
Preview
PDF (BAB III) - Published Version
81Kb
[img]
Preview
PDF (BAB IV) - Published Version
145Kb
[img]
Preview
PDF (BAB V) - Published Version
92Kb
[img]PDF (BAB VI) - Published Version
Restricted to Repository staff only

270Kb
[img]
Preview
PDF (BAB VII) - Published Version
83Kb
[img]
Preview
PDF (DAFTAR PUSTAKA) - Published Version
87Kb
[img]
Preview
PDF (LAMPIRAN) - Published Version
449Kb

Abstract

Flavonoids are a large group of plant polyphenolic compounds that are widespread in various foodstuffs and in various concentrations. Many polyphenolic compounds contained in tea, coffee, spices, cocoa, grains, cereals, flowers, vegetables, and others. Flavonoid compounds show activity as antioxidants. The content of total flavonoids in the material can be measured using methods Zhishen et al. The concentrasion of coffee powder used in the alnalysis of 100 ppm, 150 ppm, 200 ppm, 250 ppm, and 300 ppm. Observations absorbance values flavonoid compounds can be carried out in the wavelength range 300 nm - 420 nm using a spectrophotometer. Spectrophotometer is one method of instrumental analysis that uses basic interaction of energy and matter. Spectrophotometer can be used to determine the concentration of a solution through absorption intensity at a particular wavelength. The extraction can test the absorbance value at a wavelength of 374 nm using a spectrophotometer Genesys Spectonic 20 visible. The largest concentration of flavonoids found in samples of 250 ppm at 6.57%. From the calculation determining the concentration of flavonoids in arabica coffee powder obtained flavonoid content of 5.98%. Keywords: Flavonoids, Arabica Coffee Powder, Visible Spectrophotometer

Item Type:Thesis (Undergraduate)
Subjects:T Technology > TP Chemical technology
Divisions:Faculty of Engineering > Diploma in Chemical Engineering
Faculty of Engineering > Diploma in Chemical Engineering
ID Code:47834
Deposited By:Mrs Pudja D3 Teknik Kimia
Deposited On:08 Mar 2016 07:59
Last Modified:08 Mar 2016 07:59

Repository Staff Only: item control page