Determination of fruit content in peach nectar using amino acid, organic acid and mineral compositions

In this study, amino acid, organic acid and mineral profiles of peach pulp obtained from Çarşamba and Ereğli regions were identified in order to determine the fruit content of peach nectars.Totally 5 different minerals such as calcium, potassium, magnesium, sodium and phosphor were determined in peach pulp samples obtained from Çarşamba and Ereğli regions. Mineral contents were found to be differed between two regions. Citric and malic acid contents of peach pulp samples were found as 2530.07-4603.57 mg/L and 2078.53-4669.45 mg/L, respectively. In peach pulp samples, totally 19 different amino acids namely alanine, glycine, valine, leucine, isoleucine, threonine, serine, proline, asparagine, aspartic acid, metionin, glutamic acid, phenylalanine, glutamin, lysine, histidine, tyhrozine, tryptophan and sistein were investigated. Asparagin was found at the highest level, followed by aspartic acid, alanin and serin.According to the stepwise regression analysis, the equations ?Fruit content = 162.4 ? 0.316 P? and ?Fruit content = 157.7 - 0.0653 SER ? 0.0125 ASP? were developed to predict the fruit content for the pulp samples of Ereğli region and the equations ?Fruit content = 134 + 0.0243 K ? 3.75 Na ? 0.192 P? and ?Fruit content = 18.17+50.00 TA + 0.0322 SER+ 0.0072 M.A. + 0.0173 GLU? were developed for the pulp samples of Çarşamba region.