Addition Of Hydrocolloids Research Articles

Effect of food hydrocolloids on 3D meat-analog printing and deep-fat-frying

Three-dimensional (3D) printing of food product is an emerging technology. This study investigated the effects of hydrocolloid addition on 3D printing of plant-protein based meat-analogs. Meat-analog inks were formulated with soy protein isolate, gluten, canola oil, and water. Hydrocolloids (xanthan gum, pectin, hydroxypropyl methylcellulose, guar gum, locust bean gum) were added to meat-analogs formulation. The influence of hydrocolloid addition and deep-fat-frying on 3D printing process parameters, thermal, structural, and physicochemical properties of meat-analogs, were investigated. Formulated inks were used to create a specific 3D cylindrical model geometry and the printed structure were subjected to deep-fat-frying (at 180 °C, 90sec) in canola oil. Results showed that the meat-analog ink's viscosity (3871–5482 Pa s), 3D printing rate (0.34–0.39 g s−1), printing error (2.51–10.37%), printing precision (81.97–97.27%), dimensional stability (91.22–98.61%), and cooking loss (5.69–14.23%) were significantly (p < 0.05) impacted by the incorporation of hydrocolloid. Moisture-fat profile of uncooked 3D printed meat-analogs were identical, however, differences in color attributes (L∗, a∗, b∗) among the hydrocolloids added samples were observed. Moisture, fat, and color traits of 3D printed meat-analogs were substantially impacted by deep-fat-frying. During deep-fat-frying, the loss of moisture, absorption of fat, and changes in color attributes were associated with the types of hydrocolloids incorporated in formulating the meat-analog's ink. Overall, surface's structure, chemical profile, and glass-transition-temperature of 3D printed deep-fat-fried meat-analogs were extremely impacted by the addition of hydrocolloids as well as by the types of used hydrocolloids in meat-analog ink.

Impact of hydrocolloids on 3D meat analog printing and cooking

This study investigated the effects of hydrocolloid addition on three-dimensional (3D) printing and cooking of plant ingredients-based meat analog (MA). The MA inks were formulated with soy protein isolate, wheat gluten, canola oil, water, and hydrocolloids (xanthan gum, pectin, hydroxypropyl methylcellulose, guar gum, locust bean gum) at a ratio of 22:12:15:88:2. Formulated inks were used to create a specific 3D cylindrical model geometry and the printed structure were subjected to air frying (AF:180°C, 15 min) and infrared heating (IR:180°C, 15 min). Results showed that the MA ink’s viscosity (3871–5482 Pa. s), 3D printing rate (0.34–0.39 g.sec−1), printing error (2.51–10.37 %), and printing precision (81.97–97.27 %) were significantly (p<0.05) impacted by the incorporation of hydrocolloids. The dimensional stability (63.17–98.58 %), and cooking loss (6.70–17.41 %) were greatly impacted by both the hydrocolloids and post-printing cooking methods. Moisture (1.71 db) and fat (0.28 db) content of uncooked 3D printed MA were identical, whereas, differences in color attributes (L value:80.21–98.88, a value:0.01–0.13, b value:0.11–2.11) among the studied hydrocolloid added samples were observed. Moisture, fat, and color traits of 3D printed meat-analogs were significantly (p<0.05) impacted by post-printing cooking methods (AF, IR). During post-printing cooking, the loss of mass (moisture, fat) and changes in color tones were associated with the types of hydrocolloids incorporated in formulating the 3D printing ink. Surfaces and internal structure, mass loss, chemical profile, and glass-transition-temperature of 3D printed meat-analogs were significantly (p<0.05) impacted by both the type of incorporated hydrocolloids and post-printing cooking methods.

Improving the rheological properties of ultra-processed powdered goat milk beverage using texture additives.

This study aimed to investigate the static and dynamic rheological properties of an ultra-processed powdered goat milk beverage containing carboxymethyl cellulose (CMC), guar gum (GG), and xanthan gum (XG), using a mixture design. Fourteen samples were evaluated, in addition to the original beverage. The flow curves classified the fluids as non-Newtonian and characterized all the reconstituted beverages with pseudoplastic behavior, precisely due to the addition of hydrocolloids that increased the viscosity, and the fresh beverage sample showed the behavior of a dilatant fluid. The stress sweep verified the changes in the storage module (G') and the loss module (G″), the G' ranged from 1.97 to 20.36 (Pa) and the G″ ranged from 5.94 to 11.30 (Pa), demonstrating that there was the formation of beverages with elastic and viscous behaviors. The results showed a synergistic effect between the texture improvers, and the formulations with GG identified a greater effect on the tension. The frequency sweep tests showed that the behavior of the samples was that of a weak gel; however, when subjected to a certain frequency, the values of G' exceeded the value of G″, becoming a sample with more elastic characteristics and consequently, presenting the behavior of a stronger gel. Finally, according to the data presented, it is assumed that formulations containing GG and xanthan gum may produce desirable consumer properties for the reconstituted goat milk drink. Samples with a higher concentration of GG exhibited improved rheological performance, characterized by greater consistency, increased resistance to tension, and higher viscosity at low frequencies. PRACTICAL APPLICATION: The powdered goat milk drink is an innovative product that meets the demands of the food industry and consumers by offering a nutritious and sustainable beverage alternative.

Quality Evaluation of Chicken Liver Pâté Affected by Algal Hydrocolloids Addition: A Textural and Rheological Approach.

Hydrocolloids are used in spreadable meat or poultry products to improve consistency, emulsion stability and water retention, resulting in products with desired functional and organoleptic properties. The scope of the work was to evaluate the addition of three divergent algal hydrocolloids (κ-carrageenan, ι-carrageenan, furcellaran) at four different concentrations (0.25, 0.50, 0.75, and 1.00% w/w) on the physicochemical, textural, rheological and organoleptic properties of model chicken liver pâté (CLP) samples. Overall, the highest hardness and viscoelastic moduli values of the CLP samples were reported when κ-carrageenan and furcellaran were utilized at a concentration of 0.75% w/w (p < 0.05). Furthermore, increasing the concentrations of the utilized hydrocolloids led to increase in the viscoelastic moduli and hardness values of CLP. Compared to the control sample, an increase in spreadability was reported in the CLP samples with the addition of hydrocolloids. Finally, the use of algal hydrocolloids proved to be an effective way to modify the techno-functional properties of CLP.

Effect of dual modification on structural, functional and dielectric properties of cassava starch

The combined effect of hydrocolloid addition and microwave heating on the structural, physical and functional properties of cassava starch remains underexplored, despite individual studies on these modification methods. The dielectric properties, important for the microwave treatment of starch, have received little attention in recent studies. Cassava starch with and without addition of hydrocolloids (guar and xanthan gums) was modified by microwave heating for two different exposure times, and its structural, functional, and dielectric properties were studied. The dual modification enhanced the swelling power and oil holding capacity of the starch, reduced its gelatinization temperature, and did not alter its crystallinity. Notably, xanthan-modified starch microwaved for 6 min exhibited higher color variation (ΔE*) and increased granules agglomeration, while the microwave treatment alone roughened the surface of the starch granules. The mean diameters D[4,3] of starch increased with xanthan gum addition, microwave treatment (6 min), and their combination. The relative permittivity (ε’), loss factor (ε”) and penetration depth (Dp) were lower for samples modified by the combined method. Considering the type of hydrocolloid and the microwave exposure time, the combined modification significantly influenced the properties of starch, offering a promising approach to producing starch with enhanced functional properties.

Karakteristik Fisikokimia dan Sensori Selai Lembaran Albedo Semangka (Citrullus lanatus.) dengan Substitusi Daging Buah Cempedak

Sheet jam is a processed jam food product that is processed with the addition of hydrocolloid so that it has a semi-solid, plastic and non-sticky texture. This study aims to utilize the watermelon rind and chempedak fruit in the manufature of sheet jam as one of the food diversifications. This studi used a one-faktor Completely Randomizd Design (CRD), namely the comparison of the watermelon rind and chempedak fruit flesh with 3 treatment levels (50%:50%, 60%:40%, 70%:30%). Data analysis used ANOVA with Duncan's Advanced Test at 95% confidence interval. The analysis used included chemical test analysis (moistur content, ash content, pectin content, crude fiber content), physical tests (total dissolved solids and color test), sensory quality, and hedonic tests to determine the product with the best treatment. The best treatment of sheet jam was with a ratio of 50% watermelon rind and 50% puree of chempedak pulp, having a moistures content of 19.83%, ash content of 0.42%, pectin content of 3.23%, crude fiber of 2.92%, and TDS 21.8 % °Brix. The results of the sensory quality of sheet jam with the best treatment had a brownish yellow color, tended to be sweet, smelled of less strong watermelon albedo, had a strong aroma of chempedak, and quite springy in texture. The results of the hedonik test on sheet jam were the best for color, aroma, taste, texture, and Overall parameters in the direction of liking (6,42 – 7,30).

Effect of proteins and gums on rheology of rice flour, quality characteristics and estimated glycaemic index of low amylose rice gluten‐free penne

SummaryGluten‐free rice penne (GFRP) was developed from low amylose rice flour by incorporating egg white protein, soy protein isolate, guar gum and xanthan gum to produce penne with low estimated glycaemic index (eGI). The rheology of rice flour, textural properties, cooking quality, resistant starch (RS) and eGI of GFRP were investigated. Addition of proteins and hydrocolloids increased the storage modulus (G′) and loss modulus (G″). Rice gel with proteins and hydrocolloids formed a stronger and more elastic gel than the control, with highest G′ observed in rice gel with 5% egg white protein and 1% guar gum. Incorporation of proteins and hydrocolloids in GFRP significantly increased firmness, improved cooking quality and increased RS content. The eGI of GFRP added with egg white protein and guar gum reduced from seventy‐one to fifty‐three. Results suggested that the development of low eGI penne was possible by incorporating egg white proteins and guar gum.

Influence of different hydrocolloids on the pasting, rheological, and morphological characteristics of heat gelatinized cassava starch

Heat-gelatinized starch (HGS), which is prepared via heat treatment, enhances viscosity and provides suitable thickening properties, which improve water retention in products. This study aimed to investigate the potential of blending gelatinized starch with edible hydrocolloids (guar gum, carrageenan (C), locust bean gum, konjac powder, and sodium alginate) to assess their effect on the stabilization of starch gelatinization and reduction of retrogradation. Optical microscopic observations revealed the disrupted structures of gelatinized starch after heat treatments, along with diminished or absent birefringence. Adding C to the gelatinized starch reduced its peak viscosity, breakdown and setback value. For the rheological analysis, heat gelatinization and hydrocolloid addition contributed to the increased elasticity and viscosity of samples. Gelatinization and hydrocolloid addition emerged as effective strategies for improving starch quality. Although it still warrants further exploration, the introduced approach holds potential for applications in the development of convenience and canned food products.

Enriching the formulation of low-fat mozzarella cheese using micro-coated vitamin D3

PurposeThe use of polysaccharides increases solubility and consistency and causes functions such as viscosity? Moisture and food emulsifier stabilizer. This study aims to enrich the formulation of low-fat mozzarella cheese using microcoated vitamin D3 (VD3).Design/methodology/approachThis study investigates the addition of hydrocolloids to low-fat mozzarella cheese to enhance its properties and nutritional value. Tests were conducted on cheese samples with 0.05% and 0.25% hydrocolloid concentrations at various stages: before production and at three and six months’ postproduction. The samples were evaluated for elasticity, pH and solubility to select the best one, which was then fortified with VD3. The vitamin was microencapsulated using alginate and whey protein to shield it from light and oxygen, optimizing the formula using the response surface method. The fortified cheese was tested for VD3 content over its shelf life.FindingsResults indicated that all hydrocolloids tested improved moisture and meltability of the cheese while higher protein levels increased stretchability two to threefold. Rice starch hydrocolloid at 0.05% concentration was chosen due to superior sensory scores and minimal oil separation. This study concluded that VD3 levels remained stable during the cheese’s shelf life, suggesting that this approach could enhance the nutritional value of low-fat cheese without compromising its quality. Therefore, after examining the obtained results and comparing the regression models, the results indicated that the Quadratic model was chosen to investigate the effect of independent variables on the response rate, which had a statistically significant difference with other models (p = 0.0019). Also the results of the area under the curve and using the encapsulation efficiency equation, the percentage of microencapsulated vitamin was obtained, and according to the simulation results, the encapsulation efficiency was reported as 89.02%.Originality/valueDeveloping innovative functional dairy products fortified with VD3 could improve the vitamin D status in deficient populations. Therefore, these designs can be applied at industrial scales for functional cheese production.

Influence of hydrocolloids and flours on acoustic‐mechanical and microstructural properties of battered deep‐fat fried meat

SummaryThis study investigated the influence of hydrocolloid–flour mixtures on textural, structural, oil absorption and optical characteristics of batter‐coated fried meat. The batter coatings were formulated with corn, wheat and rice flours along with different hydrocolloids (methylcellulose, carboxyl methylcellulose, xanthan gum, locust bean gum, gum arabic). Textural and structural properties were assessed by acoustic‐mechanical and scanning electron microscopy, respectively. Results showed that the addition of hydrocolloids improved crispiness and reduced oil content in fried products. Comparative performances of the hydrocolloids in improving crispiness were in decreasing order as gum arabic &gt; locust bean &gt; xanthan gum &gt; carboxyl methylcellulose &gt; methylcellulose. Textural properties of the hydrocolloids were interwoven with the flour type, where corn flour demonstrating better crispiness than wheat and rice flours. The crispiness of hydrocolloids added batter increased up to seven times than the control samples. The hydrocolloids were found to significantly influence (P ≤ 0.05) the appearance of battered meat formulated with corn and wheat flours. Hydrocolloids showed prominent effect on wheat flour‐based batter in terms of average pore area, whereas highest impact on corn flour regarding the number of pores formed.

An Experimental Study on Portland Pozzolana Cement Mixed with Natural Hydrocolloids

Abstract To make a structure sturdier, the construction materials must be of higher quality. To enhance the structural qualities of fresh concrete, or improve the properties of hardened concrete, additives are added to concrete during the mixing process. To offset the high cost of chemically improving concrete, cost-effective substitutes are needed. Three hydrocolloids found in nature, namely Gum Arabic, Gum guar, and Tamarind kernel powder, have been investigated as potential concrete additives, within a range of 0.25 percent to 1.25 percent in increments, depending on the amount of cement used. The findings of the compressive strength test reveal a progressive improvement following the addition of natural hydrocolloids. Concrete strength reaches its peak at 0.75% of Gum Arabic, 0.50% of Gum guar, and 1% of Tamarind kernel powder. It is found that these hydrocolloids, when combined with concrete, improve its strength. Therefore, they may be used in the percentages specified in this study to control this effect. As an additional benefit, utilizing these hydrocolloids to improve concrete strength eliminates the need for biowaste disposal.

The Effect of Curdlan Hydrocolloid on The Characteristics and Sensory of Non-Gluten Noodles

This study aims to determine the effect of the addition of curdlan hydrocolloid on the texture of non-gluten noodles. This research was conducted with 10 treatments (sorghum flour + 0.1% curdlan, sorghum flour + 0.3% curdlan, sorghum flour + 0.6% curdlan, mocaf flour + 0.1% curdlan, mocaf flour + 0.3% curdlan, mocaf flour + 0.6% curdlan, purple taro flour + 0.1% curdlan, purple taro flour + 0.3% curdlan, purple taro flour + 0.6% curdlan, wheat flour + 0% curdlan). Observational data were processed using Two-Way ANOVA, One-Way ANOVA, and Independent T-test. The results showed that the addition of curdlan hydrocolloid and type of flour used had an effect on elongation, rehydration capacity, water holding capacity, carbohydrate content, protein, fiber, and organoleptic results in taste, aroma, color, texture, and overall panelist acceptance with the best formula being purple taro flour + 0.6% curdlan.

Impacts of Konjac Glucomannan on the Pasting, Texture, and Rheological Properties of Potato Starch with Different Heat–Moisture Treatments

AbstractFew studies reported the impact of hydrocolloid addition on starches after heat moisture treatment (HMT). In this study, potato starch is modified by HMT under different moisture content (18–35%), and the impact of konjac glucomannan (KGM) addition on the pasting, gel texture, and rheological properties of potato starch after HMT are investigated. The results showed that after HMT, the granule structure of the starch is changed with higher heat stability, shown as higher pasting temperature and trough viscosity. The impact of KGM addition is similar on the potato starch before and after HMT, but the change extent of the latter is larger in most cases, such as decreased pasting temperature and gel hardness, increased peak viscosity, breakdown viscosity, and final viscosity. This indicated that KGM benefited the gelatinization behavior of HMT starch but might not enhance the retrogradation process. The intrinsic high viscosity of KGM in water resulted in a softer starch gel and also contributed to the enhanced shear stress of the mixture paste. Therefore, the impact of KGM on the HMT starch is more significant than the original starch, and this guided the use of HMT starch in the food industry with other hydrocolloid involvement.

Effect of crude sea grape hydrocolloids extract on the rice starch physicochemical and digestibility properties

The combination of starch and hydrocolloids is widely used in food manufacturing as a thickening agent for texture modification, but a comprehensive understanding of the influence of hydrocolloids on starch properties is lacking. Sea grape (Caulerpa lentillifera) is an underutilized edible green macroalga, which is mainly cultivated in closed systems in Thailand. Here, the effects of a crude aqueous extract of sea grape hydrocolloids on thermal properties, pasting properties, gel morphology, and starch digestibility of rice starch were compared with the addition of carrageenan and sodium alginate, which are the seaweed hydrocolloids widely used in the food industry. Results showed that the addition of crude sea grape hydrocolloid extract increased retrogradation enthalpy similar to carrageenan. The seaweed hydrocolloids also impacted peak viscosity and breakdown of pasting properties. Swollen granules identified in gel morphology studies suggested that the addition of seaweed hydrocolloids restricted starch granule disruption and altered starch digestibility by increasing the rapidly digested starch content. The addition of sea grape hydrocolloids to starch produced a similar outcome to carrageenan and sodium alginate as a possible future substitute.

Physicochemical properties and sensory evaluation of gluten-free rice egg roll with hydrocolloids addition

The growing prevalence of gluten-intolerance disorder causes increasing demand for gluten-free products. This study was carried out to evaluate the quality parameters of gluten-free egg roll in terms of physical, chemical and sensory acceptability. Rice flour was utilized as a gluten-free source to replace wheat flour for the preparation of glutenfree egg roll. Hydrocolloids like carboxymethylcellulose (CMC) and xanthan gum were added at 0.4 g to enhance the quality characteristic of gluten-free egg roll made of rice flour. The results of proximate analyses revealed that the addition of hydrocolloids significantly (p&lt;0.05) increased the moisture content, ash content, crude protein, crude fat, and total carbohydrate content of gluten-free egg roll compared to egg roll made of rice flour without hydrocolloids. The addition of hydrocolloids significantly (p&lt;0.05) increased the lightness (L*) value, but egg roll added with xanthan gum significantly (p&lt;0.05) decreased the a* and b* values. The inclusion of hydrocolloids did not have a significant effect on hardness, but egg roll added with xanthan gum significantly increased the fracture strength as compared to rice flour containing egg roll. Among the hydrocolloids, egg roll added with xanthan gum resulted in a significant improvement in overall acceptability. Thus, rice flour and hydrocolloid (i.e., xanthan gum) could be suitable ingredients in producing the best quality egg roll and could provide benefits to gluten intolerance patients.

Xanthan gum and pectin as beverage stabilizers reduce the digestive enzyme hydrolysis of antioxidant and antihypertensive peptides obtained from a brewery byproduct

An acidic beverage was formulated with xanthan gum (XG), pectin (P) and brewer spent grain (BSG) peptides with antioxidant and antihypertensive properties. The impact of hydrocolloids levels on peptide bioaccessibility was studied. Peptides were obtained from BSG using Purazyme and Flavourzyme enzymes. BSG peptides were fractionated by ultrafiltration (UF) and four fractions were obtained: F1 (>10 kDa), F2 (10–5 kDa), F3 (1–5 kDa), and F4 (<1 kDa). F3 showed the highest protein purity, ferulic acid content, proportion of amphipathic peptides, and bioactive properties (ABTS+ radical scavenging and ACE-I inhibitory activity). The identified peptides from F3 by tandem mass spectrometry were 138. In silico analysis showed that 26 identified peptides had ABTS+ inhibitory activity, while 59 ones presented good antihypertensive properties. The effect of XG and P levels on bioaccessibility of F3 peptides in the formulated beverages was studied by a central composite experimental design. It was observed that F3 peptides interacted with hydrocolloids by electrostatic forces at pH of formulated beverages. The addition of hydrocolloids to formulation modulated the release of the antioxidant peptides and protected the degradation of ACE-I inhibitory peptides from F3 during simulated gastrointestinal digestion. Finally, the level of hydrocolloids that produced intermediate viscosities in the formulated beverages improved the bioaccessibility of the F3 peptides.

Quality attributes and functional properties of whole wheat bread baked from frozen dough with the addition of enzymes and hydrocolloids.

The increased demand for healthy and standardized bread has led to a demand for an efficient and promising dough improver, of natural origin, to reduce the deterioration of whole wheat bread baked from frozen dough caused by the high levels of dietary fiber and by freezing treatment. In this study, the combined effects of xylanase (XYL), lipase (LIP), and xanthan gum (XAN) on the quality attributes and functional properties of whole wheat bread baked from frozen dough were evaluated. The optimal combination, which contained XYL (0.12 g kg-1 ), LIP (0.25 g kg-1 ), and XAN (3.1 g kg-1 ), was obtained using response surface methodology (RSM). The addition of the optimal combination endowed frozen dough bread with a higher specific volume, softer texture, better brown crumb color, and greater overall acceptability. The optimal combination had no adverse impact on the volatile organic compounds (VOCs) of frozen dough bread. In terms of the functional properties of bread, the water-holding capacity (WHC), oil-holding capacity (OHC), and swelling capacity (SWC) of dietary fiber in frozen dough bread decreased in the presence of the optimal combination, whereas the glucose adsorption capacity (GAC) did not affect them. Correspondingly, the in vitro digestive glucose release was not significantly different between the control group and the optimal combination group after frozen storage. The optimal combination could improve the quality attributes and functional properties of whole wheat bread baked from frozen dough effectively, thereby increasing consumption. © 2023 Society of Chemical Industry.

Reducing starch digestibility of white rice by structuring with hydrocolloids

Controlling starch digestion in high glycaemic index staple foods such as white rice is of interest as it has been associated with reduced risk for conditions such as obesity and type-2 diabetes mellitus. Addition of hydrocolloids has been proposed to reduce the rate of post-prandial glucose by controlling the rate of starch hydrolysis. In this work, the potential of a range of hydrocolloids to modify starch digestibility when added (at 1 % maximum concentration) during cooking of white rice was first investigated. Low acyl gellan gum (LAG) showed the highest potential (in-vitro estimated Glycaemic Index reduced by about 20 %, from 94 in the control to 78 in the LAG rice) and was investigated further. While the grains of rice control and rice with LAG appeared similar, SEM images revealed a gel-like layer (a few micrometers in thickness) on the surface of the treated samples. Addition of LAG appeared to also have an effect on the breakdown of a simulated cm-sized bolus. During gastric digestion, bolus breakdown of the rice control was completed after 30 min, while the rice LAG bolus appeared intact after 1 h of observation. This was attributed to strengthening of the LAG gel in the acidic environment of the stomach. During intestinal digestion, rice samples containing 1 % LAG appeared to be less susceptible to breakdown when seen under a microscope and in environmental SEM, while they showed larger rice particle aggregates, compared to rice control. Overall, LAG showed potential to control starch digestion kinetics of white rice with a mechanism that may involve formation of a protective layer on the rice grains (um) that reduces bolus break down (cm) and enzymatic hydrolysis (nm). Outcomes of this work will be used to identify conditions for further relevant in-vitro and in-vivo investigations.

Investigation of rheological, physicochemical, and sensorial properties of traditional low-fat Doogh formulated.

Doogh is a fermented beverage made from yoghurt with water and salt. Similarly, drinks based on yoghurt are available in different countries with varying degrees of dilution, fat content, rheological properties, and taste. In this project, the use of mathematical calculations in describing rheological parameters from traditional low-fat Doogh enriched with Caspian Sea (Huso huso) gelatin (0.4 w/v %), xanthan hydrocolloids (0.4 w/v %), and their mixture at a ratio of 0.2:0.2 w/v % studied. Also, serum isolation, pH, and sensory evaluation of samples were investigated. Also, the relationship between apparent viscosity and temperature of Doogh samples using the Arrhenius equation was studied. The sensory evaluation revealed that the overall acceptance scores of the samples containing gelatin, xanthan, mix, and control were 4.31, 4.33, 4.58, and 4.12, respectively. The study on serum separation value showed control sample (45.07) and mix sample (0.84) at the end of 30 days. On the first day, the pH of the Doogh samples decreased with the addition of hydrocolloids, and this trend was time dependent. pH reduction was higher in Doogh with gelatin than in other samples. Mathematical calculations showed that the low-fat Doogh is a non-Newtonian type and shear-thinning (Pseudoplastic) fluid. The activation energy was calculated between 11.65 and 19.15 kJ/mol. According to the obtained results, it concluded that the use of two hydrocolloid compounds improved the physicochemical and sensory characteristics of the low-fat Doogh samples. Also, the Ostwald-de Waele mathematical model had a high correlation with the rheological behavior of the samples.

Karakterisasi mutu minuman jeli okra nanas dengan kombinasi karagenan-konjak[Characterization of pineapple okra jelly drink quality with different concentrations of carrageenan-konjac combination

ABSTRACTOkra-pineapple jelly drink requires hydrocolloid as a gelling agent. The combination of carrageenan-konjac hydrocolloid used was 75:25 in order to produce acceptable and good quality jelly drink characteristics. This study aimed to characterize the quality of pineapple okra jelly drink with the addition of hydrocolloid (carrageenan-konjac combination). The concentration treatments of the carrageenan-konjac combination 75: 25 in this study were 0.6%, 0.7%, 0.8%, 0.9% and 1%. The research was carried out using a completely randomized design (CRD) experimental method with one factor and 3 replications. Data were analyzed statistically with ANOVA and Duncan multiple range test. The results showed that the concentration of the carrageenan-konjac combination had a significant effect on viscosity, water content, total dissolved solids, hedonic and scoring texture quality tests, but had no significant effect on pH, hedonic and scoring tests for color, taste and aroma. The best concentration of carrageenan-konjac combination in pineapple okra jelly drink was a concentration of 0.9% which had characteristics: viscosity 2488.33 cP, pH 4.05, water content 94.22%, total dissolved solids 5.10º Brix and sensory score from 3.9-4.2 (like) for color, aroma , taste and texture. This best treatment had greenish yellow color, fragrant aroma, sweet taste and slightly chewy texture. The supporting test in the form of antioxidant activity test (IC50) was 16.47 ppm indicated in the very strong category.