Assessment of physical properties and sensory attributes of extruded corn snacks mixed with barley and supplemented with (guar and xanthan) gums.

Viscoelastic properties of [formula omitted] mixtures: comparison of guar gum with locust bean gum

Novel processed whey cheese samples were prepared with the addition of different polysaccharides (0.8% w/w), namely, xanthan gum, guar gum, locust bean gum (LBG), and κ-carrageenan, used as stabilizers and added individually or in 1:1 mixtures. Chemical composition of samples was constant, as well as final pH (5.2). The effect of added stabilizers on rheological properties, fat globule size, and sensory attributes of samples was studied, where significant (P < 0.05) differences among samples were observed in all examined parameters. Rheological properties, as determined by squeezing flow viscometry, showed strong correlations among individual parameters, as well as to sensory attributes. During squeezing flow, all samples behaved as pseudoplastic fluids. Viscosity of samples, expressed as biaxial stress growth coefficient at 0.025 s−1, ranged from 390 to 1549 kPa·s. Samples containing xanthan gum, guar gum, LBG, and mixture of xanthan and guar gums were less consistent and solid, while they were rated as having increased spreadability and smoothness. The mixtures of LBG with xanthan gum or κ-carrageenan exhibited strong synergistic effects in samples, whereas they were rated as the firmest and least spreadable. The partial substitution of κ-carrageenan with xanthan or guar gums was found to produce samples of decreased firmness and increased spreadability and smoothness. Xanthan gum allowed the formation of the largest fat globules, while the mixture of κ-carrageenan with LBG gave the smallest ones. The interactions between polysaccharides and whey proteins may be exploited so as to produce spreadable processed whey cheeses with specific functional properties and improved sensory attributes.

In this study, physicochemical and organoleptical properties of muffin cake prepared by substitution of egg white with different levels of whey protein concentrate (WPC) and different levels of guar and xanthan gums in the furmolation were evaluated.WPC at three levels ;25 , 50 and 75 % , guar gum at two levels ; 0.1 and 0.3 % , and xanthan gum at two levels ; 0.1 and 0.15 % , were considered as variable treatments . Data analysis showed that addition of WPC, significantly affected the physicohemical and sensory properties of the samples. Moreover guar and xathan gum affected all the physicochemical and sensory properties except for the after one and two days of storage, crust colour and taste. The results of this research showed that although WPC alone was not an appropriet substitution for egg white, the application of WPC at levels of 25 and 50% along with guar (0.3%) or xanthan gum (0.15%) could be an appropriate substitution for egg white while maintaining sensory properties and improving almost all of the physicohemical characteristices of muffin cakes. Key words: muffin cake; whey protein concentrate; guar gum; xanthan gum; physicochemical properties; organoleptical properties.

The present paper reports on the structural change and rheological behavior of mixtures of macromolecular suspensions (guar and xanthan gums) in crossflow microfiltration processing. Mixtures in suspension of guar and xanthan gums at low concentrations (1,000 ppm) and different proportions were processed by microfiltration with membrane of nominal pore size of 0.4 μm. The rheological behavior of the mixtures was investigated in rotational viscometers at two different temperatures, 25 and 40 °C, at the beginning and at the end of each experiment. The shear stress (τ) in function of the shear rate (γ) was fitted and analyzed with the power-law model. All the mixtures showed flow behavior index values (n) lower than 1, characterizing non-Newtonian fluids (pseudoplastic). The samples of both mixtures and permeates were also analyzed by absorbency spectroscopy in infrared radiation. The absorbency analysis showed that there is good synergism between xanthan and guar gums without structure modifications or gel formation in the concentration process by microfiltration.

The objectives were to characterize propranolol hydrochloride-loaded matrix tablets using guar gum, xanthan gum, and hydroxypropylmethylcellulose (HPMC) as rate-retarding polymers. Tablets were prepared by wet granulation using these polymers alone and in combination, and physical properties of the granules and tablets were studied. Drug release was evaluated in simulated gastric and intestinal media. Rugged tablets with appropriate physical properties were obtained. Empirical and semi-empirical models were fit to release data to elucidate release mechanisms. Guar gum alone was unable to control drug release until a 1:3 drug/gum ratio, where the release pattern matched a Higuchi profile. Matrix tablets incorporating HPMC provided near zero-order release over 12 h and erosion was a contributing mechanism. Combinations of HPMC with guar or xanthan gum resulted in a Higuchi release profile, revealing the dominance of the high viscosity gel formed by HPMC. As the single rate-retarding polymer, xanthan gum retarded release over 24 h and the Higuchi model best fit the data. When mixed with guar gum, at 10% or 20% xanthan levels, xanthan gum was unable to control release. However, tablets containing 30% guar gum and 30% xanthan gum behaved as if xanthan gum was the sole rate-retarding gum and drug was released by Fickian diffusion. Release profiles from certain tablets match 12-h literature profiles and the 24-h profile of Inderal(®) LA. The results confirm that guar gum, xanthan gum, and HPMC can be used for the successful preparation of sustained release oral propranolol hydrochoride tablets.

PurposeCeliac disease patients cannot consume gluten-containing diets; thus, gluten-free products should be offered to meet the nutritional needs of these patients. The purpose of this study was to produce gluten-free tarhana for celiac disease patients using corn flour instead of wheat flour and investigate some physicochemical properties of tarhana. Hydrocolloids were used to compensate for technological deficiencies caused by the absence of gluten.Design/methodology/approachHydrocolloids including guar gum, xanthan gum and locust bean gum were added at concentrations of 0.5% and 1.0% to the corn flour. The substituted corn flour samples were used to produce tarhana powder.FindingsThe pH and acidity measurements were carried out in 0th, 24th and 48th h of fermentation, and for all samples, the pH gradually decreased during fermentation, whereas the acidity increased. According to the color measurements (L, a and b values), it was observed that there was no significant difference (p = 0.588) between the gums in terms of L values in tarhana dough samples. Water retention capacity values of control, guar gum 1%, xanthan gum 1% and locust bean gum 1% were found to be 1.1, 1.1, 0.7 and 1.2 mL/g, respectively. The viscosity measurements were carried out at three different temperatures (30°C, 45°C and 60°C), and the viscosity values were found to decrease significantly (p = 0.000) with the increase in temperature for all the samples studied. The highest viscosity values were obtained by 1.0% xanthan gum (4,333 mPa s) and 0.5% locust bean gum (3,575 mPa s) added tarhana samples for 3 rpm at 30°C. Xanthan gum addition showed the lowest foam capacity values (0.04 mL/mL) among the samples. The samples with guar gum, xanthan gum and locust bean gum are recommended with regard to consistency and foam stability in the production of tarhana.Originality/valueThis study confirms that the use of gums in tarhana, a gluten-free system, is beneficial for the technological aspect. The unfavorable properties that can be seen because of the absence of gluten in corn flour tarhana can be compensated with the use of hydrocolloids, and tarhana can be recommended to celiac disease patients.

Effects of nonprotein substances on protein hydrolysis and plastein formation

The effect of three different hydrocolloids (Tragacanth gum, Guar gum, Xanthan gum) was compared on stability, rheological and sensory properties of fresh and 6 months stored tomato ketchup. Gums were added at five levels (0, 0.2, 0.25, 0.3, 0.35 g/100 g (w/w)) respectively to ketchup prepared with starch (0.5 g/100 g (w/w)). Statistical analysis showed gums concentration and type of gums and storage caused a significant effect on rheology and syneresis. According to results, as gums concentration was increased, a decrease occurred in syneresis values and an increase occurred in viscosity, spreadability and yield stress. Xanthan gum created the most overall texture acceptability, structure strength and links strength approximately in both fresh and stored samples in lower concentration than Guar gum and Tragacanth gum. While Xanthan gum or Guar gum created thixotropic behavior, sample containing Tragacanth gum exhibited rheopectic behavior. As concentration of Tragacanth gum was increased, a decrease occurred in rheopectic behavior. In level of 0.25 %, Xanthan gum was better than two other gums in stability, overall texture acceptability, yield stress, structure strength, spreadability, links strength in fresh and stored samples and retaining of thixotropic behavior at the end of storage, while Tragacanth gum created greater viscosity at shear rate of 500 than other two gums in fresh and stored samples that could be related to thermodynamic incompatibility between starch and this gum.

This study aims to assess the influence of various non‐starch polysaccharides at different concentrations (0.2%, 0.4%, and 0.6%) on the physicochemical, pasting, and gel properties of taro starch. Guar and xanthan gum appear to reduce the swelling power at higher temperatures while CMC improves it. Least gelation studies show that xanthan and guar gums are effective in producing firm gel at 6 and 8% of starch concentration, respectively. All hydrocolloids are found to be effective in decreasing syneresis and increase the stability of starch gel against repeated freeze−thaw (FT) cycles. The pasting properties of taro starch are greatly affected by all hydrocolloids and it is observed that guar and xanthan gums improve its peak viscosity even at the lowest concentration. The initial pasting temperature of taro starch is found to increase with gum arabic concentration while a significant decrease is noted with both guar gum and CMC which is an indication of ease in gelatinization. Xanthan and arabic gums are effective in controlling the set back of taro starch paste. The results indicate that different ratios of taro starch and hydrocolloids mixtures can play an important role as a functional additive in order to improve the quality of various processed food products.

The objective of this study was to determine the impact of adding xanthan and guar gums at different levels 2, 3 and 4% on the rheological behavior of rice flour, corn and potato starches batter, as well as, gluten-free bread quality. It could be found that consistency coefficient and apparent viscosities were gradually increased with increased the level of xanthan and guar gums from up to 4%. Addition of xanthan gum at level 3 and 4% to prepared gluten-free formula resulted in significant improvement in bread specific volume (2.94 and 2.79 cm3/g, respectively) compared with other investigated treatments. Also, the prepared gluten-free bread containing 4% of guar gum showed significant higher of lightness value 74.9 followed by 66.5 and 66.5 which given by prepared gluten-free bread with added 2 and 3% of guar gum, respectively. Gluten-free bread sample with adding 3% of xanthan and guar gums mixture was the more acceptable in sensory attributes followed by gluten-free bread by 3% of xanthan gum compared with other studied treatments. Gluten-free bread with adding 3% of xanthan and guar gums mixture was more freshness and keeping high moisture content from zero time until 72 hours of storage period followed by gluten-free bread containing 3% and 4% of xanthan gum. It could be concluded that glutenfree pan bread can be prepared with acceptable quality using rice flour, corn and potato starches by adding 3% mixture of xanthan and guar gums at 1:1 ratio.

The paper presents the results of the evaluation of the effect of additives on the rheological properties of composite flour made of wheat flour in the amount of 70% and spelt flour at 30%. As additives guar gum (0.5% by weight of flour) and xanthan gum (0.16% by weight of flour) were used. Properties of produced control dough and doughs with hydrocolloids were evaluated by means of rheological appliances by Farinograph, Extenzograph, Amylograph and Rheofermentometer. Based on the observed results it can be concluded that the addition of xanthan gum has a positive effect on increasing of farinographic water absorption capacity, extension of dough development time and dough stability and generally positively affected farinographic properties. The addition of guar gum has improved especially extensographic properties as extensographic energy and extensographic resistance. Based on amylographic evaluation of control doughs and doughs with additives it can be stated that in the dough with guar gum the amylographic maximum has slightly increased. Hydrocolloid guar gum contributed to an increased retention capacity of dough observed. Based on our measurements we can indicate that addition of guar and xanthan gum contributed to an increased rheological quality of doughs prepared with addition of flour from spelt wheat. With reference to the baking experiment it was found that the use of hydrocolloids has a positive effect on the improvement of the baking properties, in particular larger volume, specific volume, and the volume yield of the dough with the addition of guar and xanthan gum compared to the control. Our results showed that aditives significantly influenced rheological qualities of dough and a baking quality of products. These findings thus allow optimizing the recipe in order to increase the technological quality of leavened bakery products.

Influence of feeding conditions on slowing of gastric emptying by edible gums

Flocculation of food dispersions by gums: isotropic/anisotropic dispersion separation by xanthan gum

The aim of this study was to investigate the effects of the addition of guar gum (GG) and xanthan gum (XG) on the proximate composition, texture, viscosity, syneresis, color characteristics, microbiological stability, sensory evaluation, rheological properties, and microstructure of a low-fat yogurt sample. The results showed that adding GG and XG at concentrations of 0.5 and 1% increased the hardness and viscosity of yogurt significantly (p &lt; 0.05), with XG having a more pronounced effect. There was no significant difference (p &gt; 0.05) in color characteristics between all treatments during the storage period. The viability of probiotics was enhanced in gum-supplemented yogurts, with XG providing better protection for Lactobacillus delbrueckii subsp. bulgaricus and Bifidobacterium bifidum during storage. Sensory evaluation results showed that XG samples gained higher scores as compared to GG samples. Rheological analysis revealed that both the hydrocolloids guar gum (GG) and xanthan gum (XG) significantly increased the parameters such as viscosity and yield stress of low-fat yogurt, with xanthan gum having a more pronounced effect on enhancing the flow behavior. Microstructural analysis using scanning electron microscopy revealed that XG supplementation improved the yogurt gel network, developing a more compact and cohesive structure; however, GG produced a looser and more dispersed network. Overall, both GG and XG enhanced the rheological, textural, and microstructural characteristics of low-fat yogurt, with XG showing superior effects on texture, gel structure, and probiotic stability.

Effects of guar gum and xanthan gum additions on physical and rheological properties of cationic tapioca starch