首页> 外文会议>The 18th international drying symposium >EFFECT OF HIGH HUMIDITY AIR IMPINGEMENT BLANCHING PRETREATMENT ON HOT AIR DRYING KINETICS AND PRODUCT COLOR OF SEEDLESS GRAPES
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EFFECT OF HIGH HUMIDITY AIR IMPINGEMENT BLANCHING PRETREATMENT ON HOT AIR DRYING KINETICS AND PRODUCT COLOR OF SEEDLESS GRAPES

机译:高湿度空气冲击烫印预处理对无籽棉热风干燥动力学和产品颜色的影响

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Seedless grapes pretreated by high humidity air impingement blanching (HHAIB) at different temperatures (90 to 120 °C) and blanching time (30 to 120 s) were dried at 55 to 70 °C.The polyphenol oxidase (PPO) activity of the grapes decreased with the increase of blanching temperature and pretreated time.Drying experiments results showed that HHIAB treatment could significantly accelerate the drying rate.The moisture effective diffusivity ranged from 1.08×10-10 to 2.35×10-10 m2/s calculated by the Fick’s second law of diffusion.Color analysis of dried grapes showed that grape samples pretreated by HHAIB at 110 °C for 90s and dried at 55-60 °C could effectively inhibit the enzymatic browning and obtain the color of green-yellow raisins.
机译:将高湿度空气冲击热烫(HHAIB)在不同温度(90至120°C)和热烫时间(30至120 s)预处理的无核葡萄在55至70°C下干燥。葡萄的多酚氧化酶(PPO)活性随着热烫温度和预处理时间的增加而降低。干燥实验结果表明,HHIAB处理可以显着加快干燥速度。水分的有效扩散率范围为1.08×10-10到2.35×10-10 m2 / s(以菲克第二次计算)葡萄干的颜色分析表明,用HHAIB在110°C预处理90s并在55-60°C干燥的葡萄样品可以有效抑制酶促褐变,并获得绿黄色葡萄干色。

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