Homogeneous acid‐catalyzed hydrolysis of oat β‐glucan, which contains β‐(1,4) and β‐(1,3) glycosidic bonds in a nonrandom order, was studied at 353 K using HCl and H₂SO₄. A new structured kinetic model was developed that takes into account the difference in the reactivity of β‐(1,4) and β‐(1,3) glycosidic bonds as well as their positions in the polysaccharide chain. To minimize the correlation of adjustable parameters in the new model, the reactivities of these bonds were studied independently (T = 313…363 K; c_H+ = 0.1…2 mol/L) using cellobiose and laminaribiose. The difference in kinetic parameters (e.g., T = 338 K: k_β‐(1,4) = 0.693 × 10⁻³ L/mol/min, k_β‐(1,3) = 1.027 × 10⁻³ L/mol/min) was found to be statistically significant (P < 0.0001), which emphasizes the need for the structured model for oat β‐glucan hydrolysis. The simulation of β‐glucan hydrolysis with the new model was in good agreement with the experimental data and shows improvement over existing nonstructured models. © 2018 American Institute of Chemical Engineers AIChE J, 64: 2570–2580, 2018

中文翻译：

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燕麦β-葡聚糖中糖苷键的酸水解和结构动力学模型的建立

使用HCl和H ₂ SO ₄在353 K下对燕麦β-葡聚糖的均相酸催化水解进行了研究，该酶以非随机顺序包含β-（1,4）和β-（1,3）糖苷键。考虑到β-（1,4）和β-（1,3）糖苷键的反应性及其在多糖链中的位置，开发了一种新的结构动力学模型。为了最大程度地减少新模型中可调整参数的相关性， 使用纤维二糖和层状二糖独立研究了这些键的反应性（T = 313…363 K； c _{H +} = 0.1…2 mol / L）。动力学参数之差（例如T = 338 K：_{kβ-（1,4）}  = 0.693×10 ^-3 L / mol / min，_{kβ-（1,3）}  = 1.027×10^发现-3 L / mol / min具有统计学意义（P <0.0001），这强调了燕麦β-葡聚糖水解的结构化模型的必要性。用新模型对β-葡聚糖进行水解的模拟与实验数据吻合良好，显示出对现有非结构化模型的改进。©2018美国化学工程师学会AIChE J，64：2570-2580，2018