may destroy or reduce the content of tannins (Ulloa Rojas etal., 2002; terjemahan - may destroy or reduce the content of tannins (Ulloa Rojas etal., 2002; Bahasa Indonesia Bagaimana mengatakan

may destroy or reduce the content o

may destroy or reduce the content of tannins (Ulloa Rojas et
al., 2002; 2003). Storage of dehydrated arabica coffee skin
and pulp also produced a linear decrease in tannins content
(~ 39%/year) (Barcelos et al., 2001).
Smaller amounts of the main groups of CGA found in
coffee beans (caffeoylquinic acids, feruloylquinic acids and
dicaffeoylquinic acids were identified in the pulp (Clifford
and Ramirez-Martinez, 1991b). Griffin and Stonier (1975,
cited by Clifford, 1985) have reported that coffee pulp
contains CGA-protein complexes that are able to inhibit
the enzyme indole acetic acid oxidase. Anthocyanins are
commonly found in skin material of red fruit cultivars
(Mazza and Miniati, 1993).
Coffee beans: CGA have been studied for more than a
century as the main components of the phenolic fraction
of green coffee beans (Clifford, 1979; Trugo, 1984). CGA
include different groups of compounds and related isomers
formed by esterification of one molecule of quinic acid
and one to three molecules of a specific trans-hydroxycinnamic
acid (figure 1). Using the preferred IUPAC
numbering system (Clifford, 1985a; 2000), quinic acid (1L-
1(OH),3,4/5-tetrahydroxy-cyclohexane carboxylic acid) has
axial hydroxyl groups on carbons 1 and 3, and equatorial
hydroxyls on carbons 4 and 5. Esters of this acid are usually
formed on carbon 5, but also on carbons 3 and 4, and less
commonly on carbon 1. Hydroxy-cinnamic acids are
0/5000
Dari: -
Ke: -
Hasil (Bahasa Indonesia) 1: [Salinan]
Disalin!
may destroy or reduce the content of tannins (Ulloa Rojas etal., 2002; 2003). Storage of dehydrated arabica coffee skinand pulp also produced a linear decrease in tannins content(~ 39%/year) (Barcelos et al., 2001).Smaller amounts of the main groups of CGA found incoffee beans (caffeoylquinic acids, feruloylquinic acids anddicaffeoylquinic acids were identified in the pulp (Cliffordand Ramirez-Martinez, 1991b). Griffin and Stonier (1975,cited by Clifford, 1985) have reported that coffee pulpcontains CGA-protein complexes that are able to inhibitthe enzyme indole acetic acid oxidase. Anthocyanins arecommonly found in skin material of red fruit cultivars(Mazza and Miniati, 1993).Coffee beans: CGA have been studied for more than acentury as the main components of the phenolic fractionof green coffee beans (Clifford, 1979; Trugo, 1984). CGAinclude different groups of compounds and related isomersformed by esterification of one molecule of quinic acidand one to three molecules of a specific trans-hydroxycinnamicacid (figure 1). Using the preferred IUPACnumbering system (Clifford, 1985a; 2000), quinic acid (1L-1(OH),3,4/5-tetrahydroxy-cyclohexane carboxylic acid) hasaxial hydroxyl groups on carbons 1 and 3, and equatorialhydroxyls on carbons 4 and 5. Esters of this acid are usuallyformed on carbon 5, but also on carbons 3 and 4, and lesscommonly on carbon 1. Hydroxy-cinnamic acids are
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Hasil (Bahasa Indonesia) 2:[Salinan]
Disalin!
dapat merusak atau mengurangi kadar tannin (Ulloa Rojas et
al, 2002;. 2003). Penyimpanan kulit kopi arabika dehidrasi
dan pulp juga menghasilkan penurunan linear dalam konten tanin
(~ 39% / tahun) (Barcelos et al., 2001).
Jumlah yang lebih kecil dari kelompok utama CGA ditemukan di
biji kopi (asam caffeoylquinic, asam feruloylquinic dan
asam dicaffeoylquinic diidentifikasi dalam pulp (Clifford
dan Ramirez-Martinez, 1991b). Griffin dan Stonier (1975,
dikutip oleh Clifford, 1985) telah melaporkan bahwa pulpa kopi
mengandung kompleks CGA-protein yang mampu menghambat
enzim indole acetic acid . oksidase Anthocyanin yang
umum ditemukan dalam bahan kulit kultivar buah merah
. (Mazza dan Miniati, 1993)
biji kopi: CGA telah dipelajari selama lebih dari satu
abad sebagai komponen utama dari fraksi fenolik
dari biji kopi hijau (Clifford, 1979; Trugo, 1984). CGA
termasuk kelompok yang berbeda dari senyawa dan isomer terkait
yang dibentuk oleh esterifikasi satu molekul asam quinic
dan satu untuk tiga molekul dari trans-hydroxycinnamic spesifik
asam (gambar 1). Menggunakan IUPAC disukai
sistem penomoran (Clifford, 1985a ; 2000), asam quinic (1L-
1 (OH), 3,4 / 5-tetrahidroksi-sikloheksana asam karboksilat) memiliki
gugus hidroksil aksial pada karbon 1 dan 3, dan khatulistiwa
hidroksil pada karbon 4 dan 5. Ester asam ini biasanya
dibentuk pada karbon 5, tetapi juga pada karbon 3 dan 4, dan kurang
umum pada karbon 1. asam Hydroxy-sinamat yang
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