The antioxidant activity of pomegranate juices was evaluated by four different methods (ABTS, DPPH, DMPD, and FRAP) compared to those red wine a green tea infusion. Commercial showed an (18−20 TEAC) three times higher than (6−8 TEAC). in commercial extracted from whole pomegranates experimental obtained the arils only (12−14 HPLC-DAD HPLC-MS analyses revealed that contained tannin punicalagin (1500−1900 mg/L) while traces this compound were detected juice laboratory. This shows industrial...

Genotypic variation in composition and antioxidant activity was evaluated using 25 cultivars, 5 each of white-flesh nectarines, yellow-flesh peaches, plums, at the ripe (ready-to-eat) stage. The ranges total ascorbic acid (vitamin C) (in mg/100 g fresh weight) were 5−14 (white-flesh nectarines), 6−8 (yellow-flesh 6−9 peaches), 4−13 3−10 (plums). Total carotenoids concentrations μg/100 7−14 80−186 7−20 71−210 70−260 phenolics 14−102 18−54 28−111 21−61 42−109 contributions phenolic compounds...

The phenolic compounds of 25 peach, nectarine, and plum cultivars were studied quantified by HPLC-DAD-ESIMS. Hydroxycinnamates, procyanidins, flavonols, anthocyanins detected quantified. White yellow flesh nectarines peaches, red plums, analyzed at two different maturity stages with consideration both peel tissues. HPLC-MS analyses allowed the identification procyanidin dimers B- A-types, as well presence trimers in plums. As a general rule, tissues contained higher amounts phenolics,...

Sweet peppers (Capsicum annuum L.) cv. Vergasa have been studied at four maturity stages (immature green, immature red, and red). The individual phenolics (hydroxycinnamic acids flavonoids), vitamin C (ascorbic acid dehydroascorbic acid), carotenoids were characterized quantified. Five hydroxycinnamic derivatives 23 flavonoids quantified from the pericarp of sweet pepper by high-performance liquid chromatography−diode array detection−electrospray ionization−mass spectrometry. Identification...

The effect of modified atmosphere packaging (MAP) and cooking on the flavonoids vitamin C content (ascorbic + dehydroascorbic acid; AA DHAA) fresh-cut spinach was evaluated. total flavonoid (approximately 1000 mg kg(-)(1) f.w.) remained quite constant during storage in both air MAP atmospheres, while (750 kg(-)(1)f.w.) better preserved MAP-stored spinach. transformed to DHAA storage, its concentration higher tissues. free-radical scavenging activity isolated tested, only those with either a...

The influences of processing and storage on the quality indices nutritional content fresh-cut fruits were evaluated in comparison to whole stored for same duration but prepared day sampling. Fresh-cut pineapples, mangoes, cantaloupes, watermelons, strawberries, kiwifruits up 9 days air at 5 degrees C. postcutting life based visual appearance was shorter than 6 kiwifruit pineapple, cantaloupe, strawberry. On other hand, watermelon mango pieces still marketable after Losses vitamin C < or = 5%...

Hand-squeezed navel orange juice contains 839 mg/L phenolics, including flavanones, flavones, and hydroxycinnamic acid derivatives. The flavanones are the main phenolics in soluble fraction (648.6 mg/L) also present cloud (104.8 mg/L). During refrigerated storage of fresh (4 degrees C), 50% precipitate integrate into fraction. Commercial juices contain only 81-200 (15-33%) content is higher (206-644 (62-85%), showing that during industrial processing included cloud. An vitro simulation...

Carbon dioxide-enriched atmospheres are used to reduce the incidence and severity of decay extend postharvest life strawberries. The influence CO2 on quality parameters strawberries, particularly stability anthocyanins other phenolic compounds, was investigated. Freshly harvested strawberries were placed in jars ventilated continuously with air or enriched 10%, 20%, 40% at 5 °C for 10 days. Samples taken initially, after days storage, color (L* a* b* space), pH, TA, TSS, firmness measured....

The effect of minimal processing on polyphenol oxidase (PPO), peroxidase (POD), phenylalanine ammonia-lyase (PAL), and phenolic compounds was studied in five potato cultivars (Agria, Cara, Liseta, Monalisa, Spunta). Minimal caused an overall increase PPO, POD, PAL activities. isoform pattern PPO the same for all before after processing. No latent detected. isoperoxidase approximately among cultivars. An POD activity related to specific induction acidic isoperoxidase. showed characterized by...

The phenolic compounds of 15 strawberry cultivars grown in Spain were analyzed and quantified: anthocyanins (20.2−47.4 mg/100 g fw) (cyanidin 3-glucoside pelargonidin 3-glucoside, 3-rutinoside, 3-malonyl glucoside), flavonols (1.5−3.4 (quercetin 3-glucuronide kaempferol 3-p-coumaroyl-glucoside), proanthocyanidins (53.9−163.2 g), p-coumaroyl-glucose (0.84−6.70 ellagitannins (9.67−22.86 g) (sanguiin H-6, lambertianin C, galloyl bis-HHDP-glucose), ellagic acid glycosides (0.88−2.06 (two...

The use of ozonated water as a sanitizer to extend the shelf life fresh-cut lettuce and effect on antioxidant constituents (polyphenols vitamin C) were investigated. Fresh-cut iceberg (Lactuca sativa L.) was washed at 4 °C using three different dips [10, 20, 10 activated by ultraviolet C (UV-C) light mg L-1 min total ozone dose], compared with chlorine rinses. Treated packaged in air or active modified atmosphere packaging (MAP) (4 kPa O2 + 12 CO2 balanced N2) stored for 13 days °C. Despite...

Phenolic compounds, vitamin C (L-ascorbic acid and L-dehydroascorbic acid), antioxidant capacity were evaluated in orange juices manufactured by different techniques. Five processes at industrial scale (squeezing, mild pasteurization, standard concentration, freezing) used commercial juice manufacturing studied. In addition, domestic squeezing (a hand processing technique) was compared with (an FMC single-strength extraction) to evaluate their influences on health components of juice. Whole...

A comparative study of antioxidant compounds, flavonoids and vitamin C, also activity was carried out in four species Brassicaceae vegetables used for salads: watercress ( Nasturtium officinale R. Br.), mizuna [ Brassica rapa L. subsp. nipposinica (L.H. Bailey) Haneltand], wild rocket Diplotaxis tenuifolia (L.) DC.], salad Eruca vesicaria Cav.]. The characterization individual phenolic compounds by HPLC-DAD-MS/MS-ESI completes the polyphenol previously reported rocket. qualitative leaves...

Thirty-seven apricot varieties, including four new releases (Rojo Pasión, Murciana, Selene, and Dorada) obtained from different crosses between varieties three traditional Spanish cultivars (Currot, Mauricio, Búlida), were separated according to flesh color into groups. The L*, a*, b*, hue angle, chroma measurements on the skin as well other quality indices firmness, soluble solids, titratable acidity, pH plotted against total carotenoid content measured by HPLC. Among 37 ranged 1512 16500...