Nar suyu içerisindeki fenolik asitlerin HPLC-DAD ile belirlenmesi

Abstract

Bu çalışmada taze sıkılmış nar suyu, ticari nar suyu ve nar suyu konsantresi içeceklerinde beş fenolik asit, gallik, klorojenik, kafeik, p-kumarik ve ferulik asit tespit edilmiştir. Bu amaçla, nar suyu seralarda fenolik asidin karakterizasyonu ve kantifikasyonu için, yüksek performanslı sıvı kromatografisi (HPLC) kullanan, fotodiyot dizi tespiti (DAD) kombinasyonlu analitik bir yöntem geliştirildi. Sonra nar suyu analizleri yapıldı. Tek tek bileşiklerin saptama limiti, gallik asit 0.1 mg / L, klorojenik asit 0.01 mg / L, kafeik asit 0.03 mg / L, p-kumarik asit 0.02 mg / L ve ferulik asit 0.04'tür (LOD, S / N = mg / L'dir. Bireysel bileşiklerin nicelik sınırı 0.4 mg / L gallik asit, klorojenik asit 0.05 mg / L, kafeik asit 0.1 mg / L, p-kumar asit 0.1 mg / L ve ferulik asit 0.1'dir (LOQ, S / N = 10) mg / L'dir. Ticari nar suyu içindeki bağıl standart sapma (% RSD), galli k asit% 0.08, klorojenik asit% 0.32, kafeik asit% 0.21, p-kumar asit% 0.08 ve ferulik asit% 0.38 olarak bulundu. Taze sıkılmış nar suyundaki göreli standart sapma (% RSD), gallik asit% 0.01, klorojenik asit% 0.46, kafeik asit% 0.17, p-kumarik asit% 0.04 ve ferulik asit% 0.8 olarak bulundu. Nar konsantresi suyundaki göreli standart sapma (% RSD), gallik asit% 0.78, klorojenik asit% 0.25, kafeik asit% 0.49, p-kumar asit% 0.36 ve ferulik asit% 0.17 olarak bulundu.

Keywords

• HPLC,Gallik asit,Klorojenik asit,kafeik asit,p-kumarik asit,ferulik asit

Determination of phenolic acids in pomegranate juices by HPLC-DAD

Abstract

In this study, five phenolic acids, gallic, chlorogenic, caffeic, p-coumaric and ferulic acid were determined in freshly squeezed pomegranate juice, commercial pomegranate juice and pomegranate juice concentrate beverages.  For this purpose, an analytical method using high-performance liquid chromatography (HPLC), with a combination of photodiode array detection (DAD), was developed for the characterization and quantification of phenolic acid in pomegranate juices. Then the analyses of pomegranate juices was performed. The limit of detection (LOD, S/N=3) of individual compounds was gallic acid 0.1 mg/L, chlorogenic acid 0.01 mg/L, caffeic acid 0.03mg/L, p-coumaric acid 0.02 mg/L and ferulic acid 0.04 mg/L. The limit of quantitation (LOQ, S/N=10) of individual compounds was gallic acid 0.4 mg/L, chlorogenic acid 0.05 mg/L, caffeic acid 0.1 mg/L, p-coumaric acid 0.1 mg/L and ferulic acid 0.1 mg/L. The relative standard deviation (% RSD) in commericial pomegranate juice was found to be galli cacid % 0.08, chlorogenic acid % 0.32, caffeic acid % 0.21, p-coumaric acid % 0.08 and ferulic acid % 0.38. The relative standard deviation (% RSD) in freshly squeezed pomegranate juice was found to be gallic acid % 0.01, chlorogenic acid % 0.46, caffeic acid % 0.17, p-coumaric acid % 0.04 and ferulic acid % 0.8. The relative standard deviation (% RSD) in pomegranate concentrate juice was found to be gallic acid % 0.78, chlorogenic acid % 0.25, caffeic acid % 0.49, p-coumaric acid % 0.36 and ferulic acid % 0.17.

Keywords

• HPLC; gallic acid; chlorogenic acid; caffeic acid; p-coumaric acid; ferulic acid

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