Document Type : Original Article
Authors
Central Lab. for Food & Feed (CLFF),A.R.C, 588 Orman, Giza, Egypt.
Abstract
The nutrient composition of grape pomace (GP) was studied. The results
of proximate analysis indicated a low moisture content,up to 5.2%, crude protein
content up to 13.4%. Ash, ether extract, crude fiber and nitrogen free-extract contents
were 6.7%.0.48%, 27.4% and 46.82%, respectively. Ca, P, Na, K, Mg, Zn, Fe. Cu
and Mn contents were 0.814%,0.177%,0.440%, 1.88%, 1.00%,32.41 ppm, 272.00
ppm, 22.15 ppm and 41.81 ppm, respectively.
Amino acids composition showed a recovery (% total N analyzed) up to
65.61 g/16g N, and sulfur containing amino acids up to 1.94 g/16g N . Seventeen
amino acids were detected in varing concentration in GP and among ten essential
amino acids assayed. Methionine and cystine were the most limiting amino acids
with chemical score of 27.3, all compared with chick requirement reference. Essential
amino acids index values were 55.86 , all compared with whole egg reference. Gross
energy content was reasonablly high, up to 4.089 kcal/g OM. True starch equivalent
was 49.16%.
HPLC analysis of total polyphenolic compounds in grape pomace which
play an important role as natural antioxidants represent about 4.96 mgl g. Some
phenolic compounds had been found after hydrolysis in IJg/g as ± catechin 360.42,
gallic acid 240.60, chlorogenic and caffeic acid were 45.88, 11.07 respectively, rutin
and coumarin were 90.62, 55.27 respetively. Pesticide residues ( Alachlor, Aldicarb,
Chlordane and Atrazine) did not find their way in Ion grape pomace.
It can be concluded that grape pomace could be introduced as a raw
material as untraditional feedstuff for animal and poultry nutrition
Keywords
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