Thermal kinetics of Hibiscus sabdariffa L. leaves puree (HSLP) were measured to determine the energy of kinetic degradation of chlorophyll a (Chl a) & chlorophyll b (Chl b) of puree at pH (1.4 to 5.8) and temperature (343 K to 363 K). Degradation curves were fitted using first-order reaction kinetic models & the activation energy (Ea) for Chl a & Chl b was found to be 44.623±0.18, 39.158±0.25 & 35.775±0.11 kJ mol^-1 and 6.086±0.14, 5.174±0.24 & 4.328±0.20 kJ mol^-1 at pH 1.43, 3.8 & 5.8, respectively. Every single rheological estimation was done at different shear rates, temperatures, pH, & in the presence of various salts for the product development, quality control, and engineering applications. Rheological data fitted with the Herschel-Buckley model revealed that puree exhibit non-Newtonian, shear-thinning behavior at all tested concentrations and temperatures. The viscosity reached a maximum value at pH 5.8 and it decreased at lower pH values. Salts caused a reduction in viscosity. Comparatively, NaCl had a more pronounced effect than CaCl₂ at a similar concentration.

中文翻译：

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工艺参数（温度和pH）和盐对芙蓉叶原泥动力学和流变性质的影响

测量了芙蓉叶原浆（HSLP）的热动力学，以确定在pH（1.4至5.8）和温度（343 K至343 K）下，原浆叶绿素a（Chl a）和叶绿素b（Chl b）的动力学降解能。 363 K）。使用一阶反应动力学模型拟合降解曲线，发现Chla和Chlb的活化能（Ea）为44.623±0.18、39.158±0.25和35.775±0.11 kJ mol ^-1和6.086±0.14、5.174± 0.24和4.328±0.20 kJ mol ^-1pH分别为1.43、3.8和5.8。在产品开发，质量控制和工程应用中，在不同的剪切速率，温度，pH值和各种盐的存在下，进行每个流变学估算。符合Herschel-Buckley模型的流变数据表明，在所有测试的浓度和温度下，果泥都表现出非牛顿的剪切稀化行为。在pH 5.8时粘度达到最大值，而在较低pH值时粘度降低。盐引起粘度降低。相比之下，在相似的浓度下，NaCl的效果比CaCl _2的效果更明显。