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基于水滑石的全蛋液中磷吸附與解吸及動力學模型研究
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國家重點研發(fā)計劃項目(2018YFD0400304)和現(xiàn)代農(nóng)業(yè)產(chǎn)業(yè)技術(shù)體系建設(shè)專項資金項目(CARS-40-K25)


Adsorption and Desorption of Layered Double Hydroxide with Phosphorus in Whole Egg Liquid and Its Kinetic Model
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    摘要:

    全蛋液營養(yǎng)全面,含有人體所需的蛋白質(zhì)、脂類、糖類和維生素等多種成分。基于腎病患者低磷飲食的需求,采用水滑石(Layered double hydroxide,LDH)吸附法減少全蛋液中磷的含量,開發(fā)一款低磷型液蛋制品,為腎病患者提供專用型飲食。實驗研究了不同吸附溫度下,吸附時間、磷初始質(zhì)量濃度及LDH添加量對LDH磷吸附量及蛋白質(zhì)溶解度的影響,并對其動力學模型進行分析;同時探究了解吸液體積、解吸時間對LDH解吸特性的影響以及LDH重復利用情況。實驗結(jié)果表明:在1~7h內(nèi),吸附量與吸附時間成正比;各溫度下(20~45℃)吸附量和溶解度均隨磷初始質(zhì)量濃度的增加而升高;當LDH添加量為10g/L時,各溫度下吸附效果均較好。在模型分析中,Langmuir等溫式和準二級動力學模型擬合度較高,尤其吸附溫度在25℃和30℃時擬合效果最佳。解吸實驗中,最佳條件為解吸時間5h,液料比1.00L/g,且循環(huán)利用前2次可維持較好吸附效果。脫磷后必需氨基酸占總氨基酸的質(zhì)量分數(shù)大于40%,必需氨基酸與非必需氨基酸的質(zhì)量百分比大于60%,對蛋白質(zhì)營養(yǎng)性的影響較小。綜上可知,LDH是一種適于去除全蛋液中磷的吸附材料,可用于專用型液蛋制品的開發(fā)。

    Abstract:

    Whole egg liquid is nutritious, and contains proteins, lipids, carbohydrates, vitamins and other components needed by human body. Based on the demand of low phosphorus’ diet in patients with kidney disease, layered double hydroxide (LDH) adsorption method was used to reduce the phosphorus content of whole egg liquid, aiming to develop a low phosphorus liquid egg product and provide a special diet for patients with kidney disease. The effects of initial phosphorus concentration, adsorption time and the amount of LDH on the quantity of adsorption and solubility at different adsorption temperatures were studied, and the kinetic models were also analyzed. Meanwhile, the effects of volume and desorption time on desorption characteristics of LDH and the reuse of LDH were investigated. The results showed that the quantity of adsorption of phosphorus was proportional to absorption time within 1~7h, and the values of the quantity of adsorption and solubility were increased with the increase of initial phosphorus concentration at all temperatures (20~45℃). When the LDH content was 10g/L, the adsorption degree was good at all temperatures. In the model analysis, Langmuir isothermal model and quasi-second-order kinetic model had high fitting degree, especially at 25℃ and 30℃. In the thermodynamic model, ΔG was negative and ΔH was positive, and the adsorption was spontaneous and endothermic. In the desorption experiment, the optimum condition was desorption for 5h, the ratio of desorption liquid to LDH was 1.00L/g, and the two times in cyclic utilization could maintain a better adsorption degree. After dephosphorization, the percentages of essential amino acids in total amino acids and in nonessential amino acids were more than 40% and 60%, respectively, which had little effect on protein nutrition. In conclusion, LDH was a suitable adsorptive material for removing phosphorus from whole egg liquid, and can be used for the development of special liquid egg products for patients with kidney disease.

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遲玉杰,何晶,趙英,馬艷秋,安瑞琪.基于水滑石的全蛋液中磷吸附與解吸及動力學模型研究[J].農(nóng)業(yè)機械學報,2019,50(4):346-355. CHI Yujie, HE Jing, ZHAO Ying, MA Yanqiu, AN Ruiq. Adsorption and Desorption of Layered Double Hydroxide with Phosphorus in Whole Egg Liquid and Its Kinetic Model[J]. Transactions of the Chinese Society for Agricultural Machinery,2019,50(4):346-355.

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  • 收稿日期:2018-10-23
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  • 在線發(fā)布日期: 2019-04-10
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