Structures of KGM treated in two high-voltage pulse electric fields were characterized by infrared spectroscopy,Raman spectroscopy,X-ray diffraction and so on.The results showed that intermolecular hydrogen bonding interactions of KGM were reduced after being treated with high-voltage pulse electric field,but there was no significant effect on its fiber chain form and thermal characteristics.Results of the study can provide a useful reference for further study on the structure and property of KGM,and especially can provide theoretical basis for the effect of physical field on the foodstuff deep processing related to KGM.
Konjac glucomannan(KGM)was aminated by 2-chloroethyl-amine(CEA)as reagent so as to study the influence of concentration of CEA(based on the amount of KGM),concentration of NaOH,reaction time and temperature on the extent of amination.And the molecular simulation technology was adopted to analyze the conformation stability of aminate(AKGM).The results indicate that when the amount of CEA is higher,the extent of amination is higher.The optimum concentration of NaOH,reaction time and temperature are 10%NaOH,70℃and 45 min,respectively.IR shows KGM is successfully aminated.The conformation of AKGM is in a random clew-like shape.
WANG Li-XiaWEN Cheng-RongWU JingLIN Hai-DongHU Shu-GuoPANG Jie
To know the effects of irradiation on the konjac glucomannan (KGM) molecular chain membrane, KGM membrane solution was treated with the irradiation dose of 0-20 kGy in this study, and the structure and properties of KGM membrane were analyzed with Infrared spectrum, Raman spectrum, X-ray, SEM scanning and so on. The results revealed that the effects of different irradiation doses on the KGM molecular chain structure were different. Higher irradiation dose (20 kGy) resulted in partial damage against KGM membrane crystal structure, and there was no obvious change for the amorphous structure; with membrane property test, the tensile strength of KGM membrane gradually increased with the increase of irradiation dose and its elongation at break reduced, but these changes were not significant, WVP value reduced; with SEM, the membrane surface treated with irradiation was smoother even than the membrane without treatment. In addition, when increasing the irradiation dose, membrane surface became more even, and arrangement was more orderly and compact. Irradiation modification could effectively improve the KGM membrane properties, and it is an ideal modification method.
Biological activity of konjac glucomannan is closely related to its structure,in particular to its high-level structure.Researches on the activity mechanism of konjac glucomannan are significant for revealing the mysteries of participation in life activity.In this paper,analysis of the effects of konjac glucomannan configuration and various factors on its structure and activity was conducted,mechanism of biological activity of konjac glucomannan was explored,and the hot research topic of konjac glucomannan was given.
The influence of additive Konjac Glucomannan (KGM) in a variety of con- centrations on the crystallization morphology and structure of calcium oxalate (CaOxa) has been investigated by infrared spectroscopy, scanning electron microscope, X-ray diffraction and so on. The results showed KGM can complex with the Ca2+ions; low concentration KGM prevents CaOxa from aggregating, raises the concentration of ions in the solution, reduces the quantity of crystals and inhibits their growth, and the crystals are round and blunt; while high concentration KGM promotes the growth of crystal, which appears in sheet-like or irregular shape. Only CaOxa monohydrate was observed in a certain system with or without the presence of KGM.
