Florowska Anna, Florowski Tomasz, Kruszewski Bartosz, Janiszewska-Turak Emilia, Bykowska Weronika, Ksibi Nour
Department of Food Technology and Assessment, Institute of Food Sciences, Warsaw University of Life Sciences-SGGW, 159c Nowoursynowska Street, 02-787 Warsaw, Poland.
Department of Food Engineering and Process Management, Institute of Food Sciences, Warsaw University of Life Sciences-SGGW, 159c Nowoursynowska Street, 02-787 Warsaw, Poland.
Foods. 2023 Nov 17;12(22):4154. doi: 10.3390/foods12224154.
The aim of the study was to compare the properties of inulin hydrogels obtained with different methods, e.g., the traditional-thermal method and new, non-thermal methods, used in food production, like ultrasonic, high-pressure homogenization (HPH), and high hydrostatic pressures (HHPs). It was found that each of the compared induction methods allowed for obtaining inulin hydrogels. However, the use of non-thermal induction methods allows for obtaining a gel structure faster than in the case of thermal induction. In addition, hydrogels obtained with new, non-thermal methods differ from gels obtained with thermal treatment. They were characterized by higher stability (from 1.7 percent point-of-stability parameters for HHP 150 MPa to 18.8 for HPH II cycles) and in most cases, by improved microrheological properties-lower solid-liquid balance toward the solid phase, increased elasticity and viscosity indexes, and lowering the flow index. The gels obtained with the new, non-thermal method were also characterized by a more delicate structure, including lower firmness (the differences between thermal and non-thermal inductions were from 0.73 N for HHP at 500 MPa to 2.39 N for HHP at 150 MPa) and spreadability (the differences between thermal and non-thermal inductions were from 7.60 Ns for HHP at 500 MPa to 15.08 Ns for HHP at 150 MPa). The color of ultrasound-induced inulin gels, regarding the HPH and HHP technique, was darker (the differences in the L* parameter between thermal and non-thermal inductions were from 1.92 for HHP at 500 MPa to 4.37 for 10 min ultrasounds) and with a lower a* color parameter (the differences in the a* parameter between thermal and non-thermal inductions were from 0.16 for HHP at 500 MPa to 0.39 for HPH II cycles) and b* color parameter (the differences in the b* parameter between thermal and non-thermal inductions were from 1.69 for 5 min ultrasounds to 2.68 for HPH II cycles). It was also found that among the compared induction methods, the high-pressure technique has the greatest potential for modifying the properties of the created inulin hydrogels. Thanks to its application, depending on the amount of applied pressure, it was possible to obtain gels with very different characteristics, both delicate (i.e., soft and spreadable), using HHP at 150 MPa, and hard, using HHP at 500 MPa, the closest in characteristics to gels induced with the thermal method. This may allow the properties of hydrogels to be matched to the characteristics of the food matrix being created.
本研究的目的是比较通过不同方法获得的菊粉水凝胶的特性,例如食品生产中使用的传统热法以及新的非热法,如超声、高压均质化(HPH)和高静水压(HHP)。研究发现,每种比较的诱导方法都能获得菊粉水凝胶。然而,使用非热诱导方法比热诱导方法能更快地获得凝胶结构。此外,通过新的非热方法获得的水凝胶与热处理获得的凝胶不同。它们的特点是具有更高的稳定性(HHP 150 MPa时稳定性参数为1.7个百分点,HPH II循环时为18.8个百分点),并且在大多数情况下,微观流变学性质得到改善——固液平衡向固相降低,弹性和粘度指数增加,流动指数降低。用新的非热方法获得的凝胶还具有更精细的结构,包括更低的硬度(500 MPa下HHP的热诱导和非热诱导差异为0.73 N,150 MPa下HHP为2.39 N)和涂抹性(500 MPa下HHP的热诱导和非热诱导差异为7.60 Ns,150 MPa下HHP为15.08 Ns)。关于HPH和HHP技术,超声诱导的菊粉凝胶颜色更深(500 MPa下HHP的热诱导和非热诱导L参数差异为1.92,10分钟超声为4.37),a颜色参数更低(500 MPa下HHP的热诱导和非热诱导a参数差异为0.16,HPH II循环为0.39),b颜色参数更低(5分钟超声的热诱导和非热诱导b*参数差异为1.69,HPH II循环为2.68)。还发现,在比较的诱导方法中,高压技术在改变所制备菊粉水凝胶性质方面具有最大潜力。由于其应用,根据施加压力的大小,使用150 MPa的HHP可以获得非常不同特性的凝胶,既有细腻的(即柔软且可涂抹的),也有坚硬的,使用500 MPa的HHP,其特性与热法诱导的凝胶最接近。这可能使水凝胶的性质与所制备食品基质的特性相匹配。