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首页> 外文期刊>Food Hydrocolloids >Preparation, characterization and physicochemical properties of Konjac glucomannan depolymerized by ozone assisted with microwave treatment
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Preparation, characterization and physicochemical properties of Konjac glucomannan depolymerized by ozone assisted with microwave treatment

机译：臭氧溶解微波治疗的康涅甘葡甘蓝甘油甘露甘醇的制备，表征及物理化学性质

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摘要

The degradation and modification can greatly improve solubility properties of Konjac glucomannan (KGM) and enhance its capacity to interact with other polymers. Hereby, low-viscosity oxidized KGM (OKGM) was prepared by a combined method of ozone assisted with microwave. In this study, we mainly discussed the effect of ozonemicrowave treatment on the structure and properties of KGM. The experimental results indicated that ozonemicrowave treatment caused a time-dependent (30, 60, 80, 100, 120 min) degradation of KGM, and longer treatment time led to lower molecular weight (Mw) and apparent viscosity of KGM. The OKGM depolymerized by 120 min ozone-microwave showed a good water solubility index (85.08%) and low swelling power (4.29 g/g). Besides, determination of carbonyl contents showed that ozone-microwave introduced more carbonyl contents into KGM than ozonation alone. Moreover, FT-IR and XRD spectra suggested that the chemical structure and crystallized region of native KGM was altered after ozone-microwave treatments. Compared to native KGM, the thermal stability of OKGM decreased while its whiteness was enhanced. In addition, the rheological properties of OKGM differed markedly from native KGM due to the changes in Mw and molecular structure. This study provides a new pathway for efficiently producing depolymerized KGM to meet some practical production needs, and may be useful for future research and development of OKGM.
机译：降解和改性可以大大提高康康甘甘甘甘油甘油南甘油（KGM）的溶解度性能，增强其与其他聚合物相互作用的能力。因此，通过辅助微波辅助的臭氧的组合方法制备低粘度氧化KGM（OKGM）。在这项研究中，我们主要讨论了Ozonemicrovea治疗对KGM结构和性质的影响。实验结果表明，臭氧的处理引起的kgm的时间依赖性（30,60,80,100,120分钟）降解，较长的治疗时间导致较低的分子量（Mw）和Kgm的表观粘度。将OKGM脱聚120分钟臭氧微波显示出良好的水溶性指数（85.08％）和低溶胀功率（4.29g / g）。此外，羰基内容物的测定表明，臭氧微波仅将更多的羰基含量引入Kgm而不是单独的臭氧化。此外，FT-IR和XRD光谱表明，在臭氧微波处理后，天然KGM的化学结构和结晶区域被改变。与天然KGM相比，OKGM的热稳定性在增强时的增强时降低。此外，由于MW和分子结构的变化，OKGM的流变性质显着不同于天然KGM。本研究提供了一种新的途径，用于有效地生产解聚的KGM，以满足一些实际的生产需求，并且可用于未来的OKGM的研究和开发。

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