Soluble Dietary Fiber Content Research Articles

Modified dietary fiber from soybean dregs by fermentation alleviated constipation in mice.

Soybean dregs are the main by-product obtained from the processing of soy products and are good sources of dietary fiber (DF). This study showed that the soluble DF content increased from 4.97% to 18.82%, while the insoluble DF content decreased from 59.37% to 44.89% after soybean dreg fermentation using Trichoderma spp., without any significant change in the total DF content (p>0.05). Physicochemical property and electron microscopy analysis revealed that the rehydration ratio, dissolution rate, expansion force, and oil holding capacity of DF significantly increased (p<0.05) with finer microstructure. Additionally, we found that fermented DF could further promote intestinal peristalsis in mice. Furthermore, fermented DF was more effective in balancing and adjusting intestinal flora in mice and promoting the production of short-chain fatty acids. Therefore, this study provides evidence indicating a correlation between the physicochemical properties and functional benefits of DF derived from soybean dregs.

Nutritional Value, Physical Properties, and Sensory Quality of Sugar-Free Cereal Bars Fortified with Grape and Apple Pomace

Cereal bars are so-called convenience foods. Consumers value these products as a healthier alternative to traditional chocolate bars. Since these snacks usually contain added dried fruit, they have high potential for the utilisation of waste materials from the fruit industry. The study aimed to determine the effect of fortification of cereal bars with grape and apple pomace on their nutritional value, physical properties, and sensory quality. The control recipe was modified by replacing 10 or 20 g of sultanas with apple or grape pomace. The fortification with these food by-products resulted in a significant increase in the moisture content of the products, an increase in soluble fibre content, and a decrease in the level of antioxidant compounds. The strength of the cereal bars supplemented with grape and apple pomace increased. In addition, the panellists noticed a colour difference compared to the unmodified product (2 &lt; ΔE &lt; 5). A positive effect of the addition of the fruit pomace on the visual characteristics of the cereal bars was also observed. No changes were observed in the tastiness of the product. On the other hand, the aroma of the modified products and the texture of the bars containing the apple residue were less acceptable. In conclusion, cereal bars containing grape pomace and up to 10 g of apple pomace are characterised by high soluble dietary fibre content and desirable sensory and mechanical properties and are therefore recommended for industrial production.

The Effect of Atmospheric Dielectric Barrier Discharge Cold Plasma Treatment on the Nutritional and Physicochemical Characteristics of Various Legumes.

High activity of lipoxygenase (LOX) has been identified as a primary cause of oxidative rancidity in legumes. In this study, the application of dielectric barrier discharge atmospheric cold plasma (DBD-ACP) (5 W, 10 min) resulted in an obvious decrease in LOX activity in mung bean (MB), kidney bean (KB), and adzuki bean (AB) flours by 36.96%, 32.49%, and 28.57%, respectively. Moreover, DBD-ACP induced significant increases (p < 0.05) in content of soluble dietary fiber, saturated fatty acids, and methionine. The starch digestibility of legumes was changed, evidenced by increased (p < 0.05) slowly digestible starch and rapidly digestible starch, while resistant starch decreased. Furthermore, DBD-ACP treatment significantly affected (p < 0.05) the hydration and thermal characteristics of legume flours, evidenced by the increased water absorption index (WAI) and gelatinization temperature, and the decreased swelling power (SP) and gelatinization enthalpy (ΔH). Microscopic observations confirmed that DBD-ACP treatment caused particle aggregation.

Assessing the impact of drum drying on the nutritional properties of pineapple pomace-fortified crispy mushroom sheets

The processing of ‘Phulae’ pineapple fruit for juice generates a significant by-product called pineapple pomace (PAP) that has attracted interest from the functional snack industry. Pineapple pomace (PAP) is rich source of dietary fiber and antioxidants, which make it suitable for incorporating into mushroom products that are rich in high protein content. To investigate the impact of drum drying parameters on the physicochemical properties of PAP, response surface methodology (RSM) was employed for optimization of processing parameters such as steaming temperature (130 to 170°C) and rotation speed (1 to 3 rpm). The aim was to determine the optimal conditions for achieving the highest yield of diphenylpicrylhydrazyl (DPPH), ferric reducing antioxidant power (FRAP), and soluble dietary fiber (SDF), which are important indicators of antioxidant activity and dietary fiber content. These optimal conditions would be used in the production of crispy Pleurotus sajor-caju (PS-PAP) and Lentinus squarrosulus (LS-PAP) sheets both of which were supplemented with PAP. The response of PS-PAP and LS-PAP to the independent variables (steaming temperature and rotation speed) was adequately described by a second-order polynomial equation. The equations demonstrated a high degree of fit with respect to DPPH (R2 = 0.9693 for PS-PAP sheet and R2 = 0.9966 for LS-PAP sheet), FRAP (R2 = 0.9908 for PS-PAP sheet and R2 = 0.9877 for LS-PAP sheet), and SDF (R2 = 0.9689 for PS-PAP sheet and R2 = 0.9598 for LS-PAP sheet). Moreover, the experimental values of the dependent variables closely matched the predicted values, indicating the reliability of the generated models. It was evident that both steaming temperature and rotation speed significantly influenced DPPH, FRAP, and SDF contents and the optimized conditions could be employed for the production of functional crispy mushroom sheets. In conclusion, the study’s novelty lies in the optimization of PAP drum drying parameters for the production of functional crispy mushroom sheets. The research creates opportunities for sustainable and nutritious products, and future perspectives could include sensory evaluation, nutritional analysis, shelf-life studies, market potential and environmental impact assessment. Overall, this research contributes to the development of healthier and eco-friendly food options.

Evaluation of physicochemical and sensorial properties of gluten‐free boza formulated with chia and quinoa flours

AbstractBackground and objectivesBoza is a traditional cereal‐based (millet, corn, rice, etc.) and fermented beverage with sweet‐sour and bread‐like taste. It is a low‐alcohol and high‐viscosity beverage. In this study, it was aimed to develop a new gluten‐free boza formulation consisting of chia (100%), quinoa (100%) and chia + quinoa mixtures (50% + 50%) and determine its characteristics. For this purpose, physical, chemical, rheological, microbiological, and sensory properties of gluten‐free boza were researched.FindingsThe highest protein (6.44%), ash (0.89%), pH (3.24%), oil (0.84%), and mineral content were determined for the chia boza samples. The highest lightness (L*) and yellowness (+b*) values were determined in quinoa boza samples (p &lt; .05). The highest soluble dietary fiber (1.22%) and insoluble dietary fiber (1.25%) contents were determined for chia boza samples. The dietary fiber content of quinoa and chia + quinoa boza were similar (p &gt; .05). The highest lactic acid bacteria (9.03 lab log cfu/g) and yeast mould counts (6.72) were observed for quinoa boza samples. Rheological analyses results showed that all boza samples showed pseudoplastic behavior with a flow behavior index ranging from 0.66 to 0.98. The highest viscosity belonged to chia‐containing samples.ConclusionsConsidering sensory analyses, quinoa boza samples got the highest general acceptance in terms of color, sensory, flavor, and consistency according to panelists results.Significance and noveltyGluten‐free boza production with high nutritional value and acceptable taste can be achieved. For the first time, chia and quinoa were used as raw materials in the production of boza.

Effects of Co-Modification by Extrusion and Enzymatic Hydrolysis on Physicochemical Properties of Black Wheat Bran and Its Prebiotic Potential.

Black wheat bran (BWB) is an important source of dietary fiber (DF) and phenolic compounds and has stronger nutritional advantages than ordinary WB. However, the low content of soluble dietary fiber (SDF) negatively influences its physicochemical properties and nutritive functions. To obtain a higher content of SDF in BWB, we evaluated the impact of co-modification by extrusion and enzymes (cellulase, xylanase, high-temperature α-amylase, and acid protease) on water extractable arabinoxylan (WEAX) in BWB. An optimized co-modification method was obtained through single-factor and orthogonal experiments. The prebiotic potential of co-modified BWB was also evaluated using pooled fecal microbiota from young, healthy volunteers. The commonly investigated inulin served as a positive control. After co-modification, WEAX content was dramatically increased from 0.31 g/100 g to 3.03 g/100 g (p < 0.05). The water holding capacity, oil holding capacity, and cholesterol adsorption capacity (pH = 2.0 and pH = 7.0) of BWB were increased by 100%, 71%, 131%, and 133%, respectively (p < 0.05). Scanning electron microscopy demonstrated a looser and more porous microstructure for co-modified BWB granules. Through in vitro anerobic fermentation, co-modified BWB achieved a higher content of Bifidobacterium and Lactobacillus than inulin fermentation. In addition, co-modified BWB induced the highest butyric acid production, indicating high potential as prebiotics. The results may contribute to improving technologies for developing high-fiber-content cereal products.

Effect of steam explosion treatment on physicochemical, functional and structural properties of pomelo fruitlets

This study was aimed to investgate the effects of steam explosion (SE) with different temperatures at 120–220 °C on the physicochemical, functional and structural properties of pomelo fruitlets. SE treatment changed monosaccharide composition, increased total dietary fiber (TDF) and soluble dietary fiber (SDF) contents of pomelo fruitlets. Especially at 160 °C SE treatment, TDF and SDF content was 13.57% and 25.94% higher than that of the control one (p < 0.05). Moreover, water- and oil-holding capacity, swelling capacity, and invitro hypolipidemic activity (based on bile acid salt binding capacities increased by 7.95%–17.13% and pancreatic lipase inhibition capacities increased by 2.46%–6.75%) of pomelo fruitlets were significantly increased by appropriate SE conditions at 140–160 °C. This might be related to the fragmentation and porous surface structure of SE treated sample. In addition, SE treated pomelo fruitlets had higher crystallinity and thermal stability due to the rearrangement of cellulose molecular chains. It was revealed that SE treatment can effectively improve the physicochemical properties and hypolipidemic activity of pomelo fruitlets through structural changes. Our findings can provide the theoretical basis for the high value application of pomelo fruitlets as functional products through SE modification.

Image mapping of biological changes and structure-function relationship during rice grain development via Synchrotron FTIR spectroscopy

The spatial distribution of compositional elements in milky, dough, and mature rice, together with the structure-function relationship was studied using synchrotron-FTIR. The dough stage aleurone and endosperm had high lipid, protein (amide I and II), and hemicellulose. The amylopectin chain length distribution of starch exhibited small differences among developmental stages. Dough starch featured a greater portion of A and B1 chains, implying a more crystalline and high in resistant starch. The protein in milky-to-dough stage aleurone and endosperm had higher contents of α-helixes than β-sheets, resulting in higher protein digestibility and availability. There were high intensities of the glycosidic peaks of hemicellulose and cellulose, pectin, carbohydrates, and β 1–6 glucans in milky-to-dough stages. They corresponded to higher total, insoluble, and soluble dietary fiber contents in milky-to-dough stage than in mature stage. Young-stage rice was found to be more nutritious and could thus be a functional food source.

Extrusion effects on the starch and fibre composition of Canadian pulses

Pulses are important as alternative sources of protein and carbohydrates for the animal industry and, thus, require accurate evaluation of their nutrient profile during processing. Extrusion is a thermal processing of ingredients to induce physiochemical changes that convert them into more valuable products. The current study evaluated the effects of extrusion on the starch and fibre components of Amarillo peas, Dun peas, chickpeas, faba beans, lentils, and soybean meal (SBM). Pulses were extruded at 18% or 22% moisture and 110, 130, or 150 °C. Extrusion decreased ( P &lt; 0.05) the starch content in Amarillo and Dun peas but increased ( P &lt; 0.05) the same in faba beans, lentils, and SBM when compared with their whole counterparts. There was no difference in the total dietary fibre content of whole and extruded Amarillo peas, Dun peas, chickpeas, and SBM. Extrusion increased ( P &lt; 0.05) the soluble dietary fibre (SDF) content of all pulses and SBM except chickpeas. Extrusion increased ( P &lt; 0.05) for all fibre types in faba beans. Results indicate that extrusion increased the starch and SDF content of most pulses but had negative or no effects on other fibre components in all pulses except faba beans.

The impact of apple destructuring and thermal treatment on bioactive compounds: the fate of dietary fibre and polyphenols in puree and homogenate

SummaryThe present study aimed at understanding the response of dietary fibres and phenolic compounds to apple matrix disintegration and thermal treatment. Apple was processed by mimicking industrial operations of blanching, destructuring by high‐speed homogenisation (HSH) or high‐pressure homogenisation (HPH), and pasteurisation. A viscous puree (0.73 Pa × s), made of juice embedding intact cells and large cell clusters, was obtained by HSH. Conversely, HPH completely disrupted apple tissue leading to a fluid homogenate (0.27 Pa × s) in which the fibrous matrix was suspended. Despite these differences, apple puree and homogenate presented similar content of total and soluble dietary fibre, with no significant differences in the chemical structure of apple pectin, as demonstrated by FT‐IR and NMR analyses. Apple puree and homogenate retained more than 80% of the phenolic content originally present in apple pulp (about 2125 mg/gdw) without detriment to radical scavenging activity. This minor phenolic depletion, regardless of the different extent of mechanical disintegration, was mainly due to the decrease of thermolabile flavanols upon application of analogous heat treatments.

Effects of Steaming on Sweet Potato Soluble Dietary Fiber: Content, Structure, and Lactobacillus Proliferation In Vitro.

The influence of steaming treatment on the soluble dietary fiber (SDF) of sweet potato was investigated. The SDF content increased from 2.21 to 4.04 g/100 g (in dry basis) during 20 min of steaming. The microcosmic morphology of the fractured cell wall indicated the release of SDF components during steaming. The SDF from fresh (SDF-F) and 20 min steamed (SDF-S) sweet potato was characterized. The neutral carbohydrates and uronic acid levels in SDF-S were significantly higher than SDF-F (59.31% versus 46.83%, and 25.36% versus 9.60%, respectively) (p < 0.05). The molecular weight of SDF-S was smaller than SDF-F (5.32 kDa versus 28.79 kDa). The probiotic property was evaluated by four Lactobacillus spp. fermentation in vitro with these SDF as carbon source, using inulin as the references. SDF-F showed the best proliferation effects on the four Lactobacillus spp. in terms of the OD600 and pH in cultures, and the highest production of propanoic acid and butyric acid after 24 h fermentation. SDF-S presented higher Lactobacillus proliferation effects, but slight lower propanoic acid and butyric acid production than inulin. It was concluded that 20 min of steaming released SDF with inferior probiotic properties, which might derive from the degraded pectin, cell wall components, and resistant dextrin.

Fermentation of grapefruit peel by an efficient cellulose-degrading strain, (Penicillium YZ-1): Modification, structure and functional properties of soluble dietary fiber

In the study, a highly efficient cellulose-degrading strain was screened, which was identified as a fungus in the genus Penicillium sp., named YZ-1. The content of soluble dietary fiber was greatly increased by the treatment of this strain. In addition, the effects of soluble dietary fiber from high-pressure cooking group (HG-SDF), strain fermentation group (FG-SDF) and control group (CK-SDF) on the physicochemical structure, and in vitro hypolipidemic activity were investigated. The results showed that the physicochemical structure of the raw materials was improved after fermentation, and FG-SDF exhibited the loosest structure, the highest viscosity and thermal stability. Furthermore, compared to CK-SDF and HG-SDF, FG-SDF showed the most significant improvement in functional properties, including cholesterol adsorption capacity (CAC), inhibition of pancreatic lipase activity (LI) and mixed bile acid adsorption capacity (BBC). Overall, these findings will provide new insights into dietary fiber modification and improve the comprehensive use value of grapefruit by-products.

Effects of Germination, Fermentation and Extrusion on the Nutritional, Cooking and Sensory Properties of Brown Rice Products: A Comparative Study

In this study, cooked brown rice (BR), germinated brown rice (GBR), fermented brown rice (FBR) and white rice (WR) were prepared by traditional cooking techniques, and extruded brown rice (EBR) was obtained by extrusion processing technology. The nutritional, cooking and sensory properties of different BR products were investigated. The results indicated that the soluble dietary fiber (SDF) content, free total phenolic content (TPC), total flavonoid content (TFC) and antioxidant capacity (DPPH, ABTS, T-AOC) in processed BR products were significantly higher than those in cooked BR and WR. The values of SDF, free TPC, TFC and T-AOC in EBR increased by 38.78%, 232.36%, 102.01% and 153.92%, respectively, compared with cooked BR. Cooked FBR and EBR had more nutrients, required less cooking time, had a softer texture and were whiter than cooked GBR and BR, especially EBR. In addition, the water absorption rate of EBR was 14.29% and 25.41% higher than that of cooked FBR and GBR. The hardness of EBR was significantly lower than that of cooked FBR and BR, even lower than that of cooked WR. However, there was no significant difference between the hardness of cooked GBR and that of cooked BR. The flavor compounds in EBR were similar to that of cooked WR, while those in cooked GBR and FBR did not differ greatly compared to cooked BR. Collectively, cooked FBR and EBR had better nutritional value, cooking and sensory properties than cooked BR, and the comprehensive value of EBR was higher.

Effect of Layered Debranning Processing on the Proximate Composition, Polyphenol Content, and Antioxidant Activity of Whole Grain Wheat

Layered debranning processing (LDP) of whole grain wheat (WGW) could not only retain more bioactive compounds but also contributes to grain saving policy as compared with the refined wheat flour (WF). In this study, effect of different debranning rates from 0 to 13.37% on the proximate composition, polyphenol content, and the antioxidant activity were analyzed. As debranning rates increased from 0 to 13.37%, the insoluble dietary fiber content decreased from 9.94% to 6.47%, whereas the soluble dietary fiber contents increased from 3.06% to 3.98%. The free phenolic content decreased by 62.72%, while the free flavonoid content increased by 4.68% with debranning rates increasing. For the phenolic acids, protocatechuic acid and ferulic acid dominated the free and bound phenolic acid in WGW, which showed the highest contents at 6.95% and 4.45% debranning rates, respectively. As for flavonoids, naringenin (the free-state phenolic) and rutin (the bound state phenolic) in WGW had the greatest level at 4.45% debranning rate. As compared to WGW and WF, LDP significantly improved the DPPH, ABTS·+ radical scavenging activities and total antioxidant activities. In conclusion, 4.45% and 6.95% were the best debranning rates to retain polyphenol contents and antioxidant activities.

Soluble and Insoluble Dietary Fibre in Date Fruit Varieties: An Evaluation of Methods and Their Implications for Human Health.

Dietary fibre analysis is expensive due to its reliance on enzymes such as α-amylase, protease, and amyloglucosidase. This study investigated whether enzymes are essential in analysing insoluble, soluble, and total dietary fibre (IDF, SDF and TDF) contents in dry fruits with very low starch and protein contents. The IDF, SDF, and TDF were measured in date fruits using the enzymatic gravimetric method AOAC 991.43 in the ANKOM dietary fibre analyser, with and without enzymatic digestion. The study analysed six date fruit varieties with a range of texture profiles. Our results highlighted agreement between both methods in the measured IDF, SDF, and TDF values. TDF values in date fruit varieties varied considerably, from 5.67% g/100 g to 10.33% g/100 g. Results from both methods also indicate that IDF constituted the bulk of dietary fibre content in all date fruit varieties (77.8% to 91.6%), while the proportion of SDF was between 8.4% and 22.2%. This study confirms that dates are a rich source of dietary fibre, and can be a valuable functional ingredient in foods that reduce the risk of chronic diseases. The study confirmed that the inexpensive non-enzymatic technique is a viable substitute for the enzymatic method for analysing dietary fibre in dry fruits.

Total Phenolic and Total Flavonoid Content, Antioxidant Activity, and Nutritional Profile of Ziziphus mauritiana Fruit Juice

Ziziphus mauritiana is a plant species belonging to the Rhamnaceae family. It is commonly found in tropical and subtropical regions of Asia, and in Indonesia, this plant grows wild and thrives on the islands of Bali, Lombok and Sumbawa. The fruits of Z. mauritiana are edible, however, in Indonesia, it is underutilized and has very low economic value. To evaluate its possibility to be developed as a functional food, this study was conducted to determine the total phenolics and flavonoids, dietary fiber, and nutrients contained in the fruit juice of Ziziphus mauritiana. Total phenols and flavonoids contents were determined using Folin Ciocalteu and AlCl3 methods, respectively. The in vitro antioxidant activity of the juice was evaluated using the DPPH method. The content of soluble and insoluble dietary fiber was determined using the standard AOAC analysis method, and proximates analysis was conducted in accordance with SNI 01-2891-1992. The results of this study revealed that freeze-dried juice of Z. mauritiana fruit has total phenols content of 1690 mg GAE/100g, total flavonoids of 15.10 mg QE/100g, soluble dietary fiber of 0.61%, and insoluble dietary fiber 2.03%. However, the antioxidant activity of Ziziphus mauritiana fruit juice was weak with IC50 328.54 ppm. The proximate analysis revealed the crude fiber in the freeze-dried fruit juice was 0.56%, carbohydrates 82.43%, protein 3.34%, fats 0.31%, ash 3.62%, and water 10.30%. In conclusion, Ziziphus mauritiana fruit juice has a high content of total phenolic substances, high dietary fiber, and high nutritional value, therefore it has a good potential to be developed as a functional food.

Gelation mechanism of high soluble dietary fiber okara-egg tofu induced by combined treatment of steam explosion and enzymatic hydrolysis

Okara contains a large amount of insoluble dietary fiber (IDF), but it is usually treated as waste. This study was to develop a high soluble dietary fiber (SDF) egg tofu. The SDF content in okara was increased by steam explosion and enzymatic hydrolysis. The gelation mechanism of high SDF egg tofu was evaluated by adding modified okara (MO), non-modified okara (NMO) and available fraction of modified okara (AMO) into the egg tofu. The results showed that the content of SDF in okara was increased from 2.14% to 32.13% after modification. The content of SDF in high SDF egg tofu (MO Gel) was about 2.6 times that of ordinary egg tofu (Control Gel). The texture and rheological properties showed that the addition of MO and NMO improved hardness and viscoelasticity of egg tofu, while the addition of AMO destroyed the gel network structure. The addition of MO and NMO enhanced the WHC of egg tofu, while the addition of AMO promoted the immobilized water to free water, and the microstructure characterization laterally confirmed it. The above results proved that the insoluble dietary fiber (IDF) in MO and NMO played a positive role in egg tofu gel. Only addition of SDF (AMO Gel) destroyed the network structure of egg tofu gel, while the presence of appropriate content of IDF was conducive to enhance the stability of gel structure. This work provided theoretical understanding for the preparation of high SDF egg tofu.

Cross-linking, carboxymethylation and hydroxypropylation treatment to sorghum dietary fiber: Effect on physicochemical, micro structural and thermal properties

The effect of cross-linking (CL), carboxymethylation (CM), and hydroxypropylation (HP) on the physicochemical, micro-structural, and thermal properties of sorghum dietary fiber (SODF) was studied. Results reflected that all three modifications significantly (p < 0.05) increased the water absorption capacity, swelling capacity, oil absorption capacity, and soluble dietary fiber content of SODF with CM being the most effective treatment. The CM significantly (p < 0.05) improved the solubility (9.9 %), whereas CL (4.65 %) and HP (2.79 %) significantly reduced the solubility of native SODF. The color analysis reflected the decrease in L* value after all modifications, indicating an increase in brown color of SODF. XRD analysis reflected an increase in crystallinity value (14.47 to 17.94 %) of SODF after modifications, resulting in increased thermal stability of modified SODF. The DSC results revealed the increased decomposition temperature of cross-linked and hydroxypropylated dietary fiber showing improved thermal stability of these types of modified fibers. The changes in thermal, physicochemical, and microstructural properties of SODF after modification could be ascribed to the changes in structure and chemical composition as reflected from SEM, XRD, and FTIR analysis.

Physicochemical, structure properties and in vitro hypoglycemic activity of soluble dietary fiber from adlay (Coix lachryma-jobi L. var. ma-yuen Stapf) bran treated by steam explosion.

To enhance the content of adlay bran soluble dietary fiber (SDF) and improve its functionality, we investigated the influences of steam explosion (SE) on the physicochemical, structural properties, and in vitro hypoglycemic activities of adlay bran SDF. The cellulose, hemicellulose, and lignin contents of adlay bran decreased significantly after SE treatment. When the SE strength was 0.8 MPa for 3 min, the SDF content was 9.37%, which was a significant increase of 27.48% compared to the control. Under these conditions, SDF showed the highest oil-holding capacity (OHC) (2.18 g/g), cholesterol adsorption capacity (CAC) (27.29 mg/g), glucose adsorption capacity (GAC) (15.54 mg/g), glucose dialysis retardation index (GDRI) (36.57%), and α-Amylase activity inhibition ratio (α-AAIR) (74.14%). Compared with SDF from untreated adlay bran, SDF from SE-treated adlay bran showed lower weight molecular. In addition, differential scanning calorimetry (DSC) measurement showed that the peak temperature of SDF from adlay bran treated by SE increased by 4.19°C compared to the untreated SDF sample. The structure of SDF from adlay bran treated by SE showed that the SDF surface was rough and poriferous and the specific surface areas increased. In conclusion, SE pretreatment increases the content of SDF in adlay bran and improves its physicochemical, structural properties, and biological activities, which will be beneficial for the further exploitation of adlay bran.

Optimization of Mixed Fermentation Conditions of Dietary Fiber from Soybean Residue and the Effect on Structure, Properties and Potential Biological Activity of Dietary Fiber from Soybean Residue.

Soybean residue is a by-product of soybean product production that is wasted unreasonably at present. Accomplishing the efficient utilization of soybean residue can save resources. A composite microbial system was constructed using lactic acid bacteria (LAB) and Saccharomyces cerevisiae (SC), and modified soybean residue was prepared by solid fermentation. In order to explore the value of modified soybean residue as a food raw material, its physical and chemical properties, adsorption properties, and antioxidant properties were studied. The results showed that the soluble dietary fiber (SDF) yield of mixed fermentation (MF) increased significantly. Both groups of soybean residues had representative polysaccharide infrared absorption peaks, and MF showed a looser structure and lower crystallinity. In terms of the adsorption capacity index, MF also has a higher adsorption capacity for water molecules, oil molecules, and cholesterol molecules. In addition, the in vitro antioxidant capacity of MF was also significantly higher than that of unfermented soybean residue (UF). In conclusion, our study shows that mixed fermentation could increase SDF content and improve the functional properties of soybean residue. Modified soybean residue prepared by mixed fermentation is the ideal food raw material.