Characterization of organic acids in juices of some Pakistani citrus species and their retention during refrigerated storage.

Organic acids play pivotal role in flavor and consumer acceptance of fruit beverages. Concentration of some organic acids in citrus juices was determined through HPLC and their retention during refrigerated storage was also evaluated. The concentration of organic acids were in the following pattern Citric Acid> Malic Acid> Ascorbic Acid> Tartaric Acid. Citric acid, malic acid, ascorbic acid and tartaric acid content ranged from 925.92 mg/100 mL (Kinnow) to 1323.25 mg/100 mL (Musambi), 9.67 mg/100 mL (Musambi) to 519.62 mg/100 mL (Kinnow), 36.38 mg/100 mL (red blood) to 51.43 mg/100 mL (Kinnow), 0.318 mg/100 mL (Musambi) to 0.825 mg/100 mL (Kinnow), respectively in different citrus species. Storage studies revealed that ascorbic acid losses were 11% to 15% and citric acid contents were decreased from 0.7% to 1.9% during refrigerated storage while malic acid contents increase d 1% to 4% and tartaric acid content increased 2% to 4% thoroughout the storage period.

[1]  D. Cutler,et al.  Education and Health , 2014 .

[2]  V. Nour,et al.  HPLC organic acid analysis in different citrus juices under reversed phase conditions. , 2010 .

[3]  A. Ismail,et al.  Flavonoid, hesperidine, total phenolic contents and antioxidant activities from Citrus species , 2010 .

[4]  I. Khalil,et al.  Studies on the Biochemical Composition of Commercial Citrus Juices and Laboratory Prepared Pineapple Juices , 2010 .

[5]  Donghong Liu,et al.  Juice components and antioxidant capacity of citrus varieties cultivated in China , 2008 .

[6]  Kun-song Chen,et al.  Bioactive compounds and antioxidant capacities in different edible tissues of citrus fruit of four species , 2007 .

[7]  O. Martín‐Belloso,et al.  Comparative study on shelf life of orange juice processed by high intensity pulsed electric fields or heat treatment , 2006 .

[8]  F. Karadeniz.  Main Organic Acid Distribution of Authentic Citrus Juices in Turkey , 2004 .

[9]  P. Cancalon,et al.  Changes in organic acid composition of citrus juices during the 2000-2001 season , 2002 .

[10]  G. Dugo,et al.  Citrus: the genus Citrus. , 2002 .

[11]  S. Gönç,et al.  Variation in organic acids content during ripening of pickled white cheese. , 2002, Journal of dairy science.

[12]  C. Johnston,et al.  Stability of ascorbic acid in commercially available orange juices. , 2002, Journal of the American Dietetic Association.

[13]  A. Hasib,et al.  HPLC DETERMINATION OF ORGANIC ACIDS IN MOROCCAN APRICOT DETERMINACIÓN POR HPLC DE ÁCIDOS ORGÁNICOS EN ALBARICOQUE MARROQUÍ DETERMINACIÓN POR HPLC DE ÁCIDOS ORGÁNICOS EN ALBARICOQUE MARROQUÍ , 2002 .

[14]  E. Farnworth,et al.  Thermal processing, storage conditions, and the composition and physical properties of orange juice , 2001 .

[15]  J. Iqbal,et al.  Effect of Washing and Seal Packaging on Scuffing Damaged Citrus Fruit Quality , 2001 .

[16]  J. Bailey-Serres,et al.  Pummelo Fruit Transcript Homologous to Ripening-Induced Genes , 1995, Plant physiology.

[17]  M. Pilar Cano,et al.  HPLC determination of organic acids in pineapple juices and nectars , 1994 .

[18]  K. Mather,et al.  The biometrical approach , 1977 .

[19]  P. Morris.  Education and Health , 1938, Midwives chronicle.