Effects of food hydrocolloids on quality attributes of extruded red Jasmine rice noodle

Utilization of heat-induced curdlan gel to improve the cooking qualities of thermally sterilized fresh rice noodles

Thermal sterilization is the most economical and efficient method to guarantee the shelf life of extruded fresh rice noodles, but it often leads to a high cooking breakage rate and poor elongation at break of the noodles. The aim of this study was to improve the edible quality of sterilized fresh rice noodles through the addition of low concentrations of curdlan (0.38 %-1.13 %), which can form a thermal-irreversible gel to resist high-temperature sterilization. Compared with the control group without curdlan, the cooking breakage rate of sterilized fresh rice noodles with 1.13 % curdlan decreased from 16.85 % to 5.22 %, the tensile strain increased from 91.15 % to 147.05 %, and the microstructure was more dense and uniform. The results showed that adding the proper amount of curdlan is an effective strategy to improve the quality of sterilized fresh rice noodles.

Effect of guar gum and egg addition on characteristics of noodle analog made from rice flour

Noodle analog is a non-gluten-based noodle. Noodle analog made from rice flour is known to have less desirable physical characteristics, such as a harder and less chewy texture. The addition of guar gum as a hydrocolloid and egg in this research was done to improve the rice-flour-based noodle analog characteristics. The aim of this research was to determine the best guar gum and egg concentration to enhance the noodle analog characteristics. The guar gum was added in several concentrations (1.5%, 2%, 2.5%, and 3% w/w), and raw fresh chicken egg was also added in different concentrations (3%, 5%, and 7% w/w). The best noodle analog was obtained with the addition of 3% guar gum and 5% raw fresh chicken egg. This formulation has the lowest adhesiveness value, high elongation, cohesiveness and springiness, with better cooking quality, such as low cooking loss and moderate water absorption. The best noodle analog was then compared to the commercial noodle. The noodle analog had a lower cooking loss, but the wheat flour-based commercial noodle still had better textural properties, such as softer, less adhesive, and springier texture. However, the noodle analog had better cohesiveness and higher tensile strength with a similar elongation compared to wheat flour-based commercial noodle.

Designing of texture modified fruit juices using food hydrocolloids: Storage influence on viscosity

Elderly individuals require special dietary considerations due to various physiological dysfunctions (such as dysphagia, constipation, etc.) and specific nutritional needs. Dysphagia, the difficulty associated with swallowing can lead to some challenges in containing and transitioning of food or liquids within the mouth, increasing the risk of aspiration pneumonia. Thickening fluid is an effective method for alleviating swallowing difficulties. It works by slowing down the flow of liquids during swallowing, thus reducing the risk of aspiration into the airway. The purpose of this research is to develop texture-modified (TM) fruit juices to cater to the needs of elderly individuals with impaired swallowing abilities. To achieve this goal, we created TM fruit juices thickened with hydrocolloids, specifically guar gum (GG), xanthan gum (XG), and starch (S), at different concentrations. The thickened liquids, classified at three National Dysphagia Diet levels, were stored at 4 °C for three months. Physicochemical analyzes of the fruit juices were performed before and after storage. The sensory differences and flow behaviors of orange juice samples containing ascending concentrations of all studied thickeners were investigated at the end of the three-month storage. The results indicated significant changes in the physicochemical properties of the samples, depending in the type of fruit, the hydrocolloid used, and the storage period. Sensory evaluation revealed that orange juices containing starch were more preferred compared to other samples. Therefore, using orange juice thickened with easily swallowed, and less viscous starch will be a safer option for the elderly and individuals with swallowing difficulties.

Formulation optimization and characterization of functional Kemesha

This study aimed to enhance Kemesha by incorporating a blend of composite flours, including germinated haricot bean, ultrasonicated fine-milled pumpkin, CMC (Carboxymethyl cellulose), and common wheat flour. Additionally, a D-optimal design was employed to optimize the formulation and achieve the desired outcome. Protein, fibre, total carotenoid content, and firmness were responses for optimizing Kemesha formulation. The numerical optimization and model validation results indicated that it is feasible to use a flour composition of 63.00 g common wheat flour, 19.01 g germinated haricot bean flour, 14.51 g ultrasonicated fine-milled pumpkin flour, and 3.48 g carboxymethyl cellulose (CMC) per 100 g of flour to prepare Kemesha with desirability of 0.596. The proximate composition analysis results showed that the optimized Kemesha had higher levels of fibre, ash, and protein compared to the control Kemesha, whereas the carbohydrate content was significantly lower. The studies on color estimation revealed that the yellow color of the product was slightly increased during the optimization of Kemesha (15.09-31.09), while the brightness index was reduced from 89.38 to 74.44. Compared to the control kemesha, the optimized Kemesha had a total phenolic, flavonoid, and carotenoid content of 7.47, 3.67, and 149.20 times greater. The cooking loss (4.95%) and water absorption (220.68%) of optimized Kemesha were improved compared to control Kemesha. The composite significantly improved the sensory qualities of both raw and cooked Kemesha, including surface smoothness, resistance to break, appearance, texture, color, and overall acceptance.

The use of hydrogel structures in production of extruded rice and investigation of its qualitative characteristics

The aim of this study was to investigate the quality parameters of extruded rice containing hydrogel and comparing with natural rice (Hashemi variety rice). Extruded rice was produced with composite hydrogel (gellan, xanthan and sodium alginate) at the concentrations of 0.0 (control sample), gellan (0.5%)-alginate (0.5%) (GA1), gellan (1%)-alginate (1%) (GA2), gellan (0.5%)-alginate (0.5%)-xanthan (0.1%) (GAX 1%), and gellan (1%)-alginate (1%)-xanthan (0.2%) (GAX2%). The use of hydrogels had no significant effect on moisture content, ash content, cooking time, and color properties of extruded rice (p ≥ .05). In contrast, hydrogel significantly increased water absorption ratio (WAR), water solubility index (WSI), water absorption index (WAI), and textural properties (p ˂ .05) of extruded rice. This observation supports the highest score found for extruded rice containing GA2% and GAX2% in sensory properties, which were similar to natural rice. GA2% rice sample showed the similar texture characteristic, cooking feature, and color parameter to natural rice, ultimately, showing better organoleptic properties.

Effect of different extrusion methods on physicochemical properties and qualities of noodles based on rice flour

Rice noodles have been manufactured in the food industry using different extrusion methods, such as traditional and modern extrusions, which affect the noodle structure and qualities. Therefore, the effects of the extrusion process on qualities of rice noodles using the same blend of rice flour and crosslinked starch were evaluated. In this study, a capillary rheometer was used as an alternative approach to simulate the traditional extrusion method in which the noodles are obtained by continuously pressing the pregelatinized noodle dough through a die. For modern extrusion, a twin-screw extruder was employed to obtain the noodles in a one-step process. The optimal range of moisture content used in the formulation was studied. Upon cooking, the noodles showed a decrease in cooking time and cooking loss with increasing moisture content in the formulation. All cooked noodles showed comparable tensile strength, but those extruded by a twin-screw extruder had substantially greater elongation. Scanning electron micrographs revealed that the noodles prepared using the extruder had a denser starch matrix, while those obtained from a capillary rheometer showed the aggregation of starch fragments relevant to the existence of starch gelatinization endotherm from differential scanning calorimetry. This indicated that the extrusion process using the twin-screw extruder provided a more uniform starch transformation, i.e., more starch granule disruption and gelatinization, thus giving the noodles a more coherent structure and better extensibility after cooking. The obtained results suggested that different thermomechanical processes used in the noodle industry gave the extruded rice noodles different qualities respective to their different microstructures.

Effect of White Kidney Bean Flour on the Rheological Properties and Starch Digestion Characteristics of Noodle Dough

The aim of this study was to investigate the effect of adding white kidney bean flour on the quality of noodles. We selected four different proportions of white kidney bean flour (10−40%) in wheat flour to make the noodles, after which the noodles were analysed for their physical and chemical properties. The statistical method of correlation analysis was used in this study. The results showed that the noodles’ sensory and textural characteristics significantly improved after adding white kidney bean flour (p < 0.05). Compared with the control, the noodles’ surface with white kidney bean flour was denser and smoother. Moreover, microstructural observations indicated that the noodles with white kidney bean flour showed a more continuous protein network. The in vitro digestion results showed that the addition of white kidney bean flour reduced the digestibility of the noodles. Low addition of the flour (10−20%) improved the quality of the noodles, whereas high amounts (30−40%) showed the opposite effect. In this study, the optimal amount of white kidney bean powder was found to be 20%.