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present experiment, infusion or postpeeling treatment with 1% citric acid solution (pH = 2.30) reduced surface pH from 5.0 to 5.5 to ≈3.0 to 3.5, which would explain growth suppression of fast-growing spoilage bacteria ( Pao and Petracek, 1997 ). The

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inheritance of flower color was attributed to the combined effect of anthocyanin pigmentation and pH, the latter being controlled by two independent codominant genes, Ph1 and Ph2 ( Griesbach, 1996 ). In morning glory, flower color varied from reddish

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evaporator and the aqueous phase was adjusted to pH 2.8 with 1% hydrochloric acid (Merck) and extracted three times with ethyl acetate (Merck). It was evaporated to dryness, dissolved in 1 mL of HPLC methanol, and used for of ABA and GA 3 quantification at

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.00125pHT – 0.01857pH 2 – 0.000032T 2 ( F = 90.4048**)]. Three-dimensional response surface plot showing the effect that when pH = 5.4461, T = 8.916 h, the solubility reached a maximum value of 0.0564 ± 0.0032 mg. At the same time, the pH value of

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samples were collected 39, 74, 94, and 138 DAPF in 2014; and 30, 63, 93, and 122 DAPF in 2015. Soil P was extracted by Mehlich-3 [solution pH, 2.5; soil:solution ratio, 1:10 ( Mehlich, 1984 )], AB-DTPA [solution pH, 7.6; soil:solution ratio, 1

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a 5-μm particle size (Merck, Darmstadt, Germany). The mobile phase was 2% KH 2 PO 4 adjusted to pH 2.3 with H 3 PO 4 . Results were expressed as mg AA/100 mL of juice. Flavanone glycosides. HES, NAT, and DID (mg/100 mL) were determined by

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dihydrogen phosphate and 4.0 m m triethylamine adjusted to pH 2.75 with 85% orthophosphoric acid. The flow rate was 1.0 mL·min –1 and the total chromatographic run time was 14 min. The sample injection volume was 50 μL. To improve the detector sensitivity

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(pH 2.2) and the flow rate was 1 mL·min −1 . Statistical analysis. Statistically significant differences ( P ≤ 0.05) were determined for the microbial counts, gas concentration, and visual and physicochemical evaluation data based on an analysis of

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) at pH 2.4 ± 0.01 was used for vitamin C analysis. Two milliliters of juice were mixed with 2 mL of 2.4% (w/v) metaphosphoric acid and centrifuged at 6900 g n for 5 min at 5 °C. An aliquot of the centrifuged sample (0.5 mL) was then transferred to a

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at each harvest date. Soluble solids concentration was calculated using a refractometer. Titratable acidity and pH were measured by Metrohm 800 Dosino 862 Compact Titrosampler and electrode standardized to pH 2.00, 4.00, 7.00, and 10.00 buffers

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