Influence of osmotic concentration, continuous high frequency ultrasound and dehydration on antioxidants, colour and chemical properties of rabbiteye blueberries

Abstract Rabbiteye blueberries ( Vaccinium ashei Reade) were osmoconcentrated in a sucrose solution for 12 h, and for 3 h, with and without high frequency ultrasound (CHFU). Treated and untreated samples were air-dehydrated (70 °C, 10 h). Osmoconcentration decreased titratable acidity and induced a high loss of anthocyanins and phenolics. Approximately 60% of anthocyanins and phenolics were lost during osmoconcentration for 12 h. Air-dehydration further decreased anthocyanins and phenolics, with a higher negative influence on anthocyanins. Dehydration, after osmotic concentration, produced the largest colour differences in comparison to the control. High frequency ultrasound had a negative influence on anthocyanins and phenolics. Antioxidant activity was lowest in osmoconcentrated and dehydrated berries. Combination of high temperature, high sugar concentration and oxygen availability had the largest negative influence on colour and antioxidant properties (anthocyanins and phenolics) of dehydrated rabbiteye blueberries.

[1]  H. Ramaswamy,et al.  CONVECTIVE-AIR DRYING KINETICS OF OSMOTICALLY PRE-TREATED BLUEBERRIES , 1998 .

[2]  Barbara Shukitt-Hale,et al.  Reversals of Age-Related Declines in Neuronal Signal Transduction, Cognitive, and Motor Behavioral Deficits with Blueberry, Spinach, or Strawberry Dietary Supplementation , 1999, The Journal of Neuroscience.

[3]  H. Ramaswamy,et al.  OSMOTIC DEHYDRATION KINETICS OF BLUEBERRIES , 1998 .

[4]  V. L. Singleton,et al.  Colorimetry of Total Phenolics with Phosphomolybdic-Phosphotungstic Acid Reagents , 1965, American Journal of Enology and Viticulture.

[5]  J. Floros,et al.  Acoustically assisted diffusion through membranes and biomaterials : Ultrasonic applications in the food industry , 1994 .

[6]  H. D. Goff,et al.  The effect of freezing method and frozen storage conditions on the microstructure of wild blueberries as observed by cold-stage scanning electron microscopy , 2006 .

[7]  P. Bickford,et al.  Short-Term Dietary Supplementation of Blueberry Polyphenolics: Beneficial Effects on Aging Brain Performance and Peripheral Tissue Function , 2000 .

[8]  D. Torreggiani,et al.  Changes in anthocyanins in cherries (Prunus avium) during osmodehydration, pasteurization and storage , 1993 .

[9]  W. Kalt,et al.  Interspecific variation in anthocyanins, phenolics, and antioxidant capacity among genotypes of highbush and lowbush blueberries (Vaccinium section cyanococcus spp.). , 2001, Journal of agricultural and food chemistry.

[10]  C. S. Yang,et al.  Effect of Four Drying Methods on the Quality of Intermediate Moisture Lowbush Blueberries , 1985 .

[11]  A. Lenart.  Osmo-convective drying of fruits and vegetables: technology and application , 1996 .

[12]  T. Yang,et al.  Use of a Combination Process of Osmotic Dehydration and Freeze Drying to Produce a Raisin-Type Lowbush Blueberry Product , 1987 .

[13]  Juming Tang,et al.  MICROWAVE and SPOUTED BED DRYING of FROZEN BLUEBERRIES: the EFFECT of DRYINGAND PRETREATMENT METHODS ON PHYSICAL PROPERTIES and RETENTION of FLAVOR VOLATILES , 1999 .

[14]  R. Durst,et al.  Changes in anthocyanins and polyphenolics during juice processing of Highbush blueberries (Vaccinium corymbosum L.) , 2000 .

[15]  W. Kalt,et al.  Chemical Composition of Lowbush Blueberry Cultivars , 1996 .

[16]  W. Horwitz.  Official Methods of Analysis , 1980 .

[17]  Romeo T. Toledo,et al.  Effect of Osmotic Dehydration and High Temperature Fluidized Bed Drying on Properties of Dehydrated Rabbiteye Blueberries , 1987 .

[18]  W. Kalt,et al.  Antioxidant capacity as influenced by total phenolic and anthocyanin content, maturity, and variety of Vaccinium species , 1998 .

[19]  R. Wrolstad,et al.  Anthocyanins, phenolics, and antioxidant capacity in diverse small fruits: vaccinium, rubus, and ribes. , 2002, Journal of agricultural and food chemistry.

[20]  C. Berset,et al.  Use of a Free Radical Method to Evaluate Antioxidant Activity , 1995 .

[21]  Hosahalli S. Ramaswamy,et al.  QUALITY EVALUATION OF OSMO-CONVECTIVE DRIED BLUEBERRIES , 1998 .

[22]  B. D. Oomah,et al.  Antioxidant Activity and Total Phenolics in Selected Fruits, Vegetables, and Grain Products , 1998 .

[23]  N. Trinajstic,et al.  Anthocyanin Degradation in the Presence of Furfural and 5-Hydroxymethylfurfural , 1983 .

[24]  Eric J Hanson,et al.  Changes in fruit antioxidant activity among blueberry cultivars during cold-temperature storage. , 2002, Journal of agricultural and food chemistry.

[25]  W. Kalt,et al.  Anthocyanins, Phenolics, and Antioxidant Capacity of Processed Lowbush Blueberry Products , 2000 .

[26]  L. Lim,et al.  Moisture sorption characteristics of freeze dried blueberries , 1995 .

[27]  R. Wrolstad.  Color and pigment analyses in fruit products , 1993 .

[28]  R. Kuehl.  Design of Experiments: Statistical Principles of Research Design and Analysis , 1999 .

[29]  Jungmin Lee,et al.  Extraction of Anthocyanins and Polyphenolics from Blueberry Processing Waste , 2006 .

[30]  G. Srzednicki,et al.  The Change of Total Anthocyanins in Blueberries and Their Antioxidant Effect After Drying and Freezing , 2004, Journal of biomedicine & biotechnology.

[31]  R. P. Konstance,et al.  Dehydrated Blueberries by the Continuous Explosion-Puffing Process , 1982 .

[32]  C. Forney,et al.  Antioxidant capacity, vitamin C, phenolics, and anthocyanins after fresh storage of small fruits. , 1999, Journal of agricultural and food chemistry.

[33]  Y. Amakura,et al.  Influence of jam processing on the radical scavenging activity and phenolic content in berries. , 2000, Journal of agricultural and food chemistry.

[34]  J. Larrauri,et al.  A procedure to measure the antiradical efficiency of polyphenols , 1998 .