Water-insoluble Dietary Fiber Research Articles

Structure, physicochemical and adsorption properties of insoluble dietary fiber from Lycium barbarum residue: A potential functional factor

This study was designed to explore the dietary fiber potential of Lycium Barbarum residue, aiming to ascertain its viability as a sustainable dietary fiber source. The study examined the extraction of water-insoluble dietary fiber (LBIDF) from Lycium barbarum residue (LBR) using the enzymatic method. The comparison involved analyzing the monosaccharide composition, microstructure, physicochemical properties, and adsorption properties of LBR and LBIDF. The results indicated that LBIDF possesses the ideal physicochemical properties compared to LBR. Through instrumental analysis, it has been demonstrated that LBIDF possesses a specific structure and functional group of fibers, making it suitable for processing below 300 °C. Furthermore, LBIDF exhibited an optimal functional capacity for cholesterol (41.749 mg/g vs. 31.464 mg/g in LBR), bile acid (30.623 mg/g vs. 19.875 mg/g in LBR), nitrite ion (1159.394 μmol/g vs. 783.261 μmol/g in LBR), glucose (3.552 mmol/g vs. 2.664 mmol/g in LBR), and glucose dialysis retardation index (6.43% vs. 13.52% in LBR). LBIDF can inhibit the digestion of fat and starch in vitro. These findings implied that dietary fiber samples from LBR may offer potential as functional food components.

Daily standing time, dietary fiber, and intake of unsaturated fatty acids are beneficially associated with hepatic insulin sensitivity in adults with metabolic syndrome.

Obesity is associated with impaired glucose metabolism and hepatic insulin resistance. The aim was to investigate the associations of hepatic glucose uptake (HGU) and endogenous glucose production (EGP) to sedentary behavior (SB), physical activity (PA), cardiorespiratory fitness, dietary factors, and metabolic risk markers. Forty-four adults with metabolic syndrome (mean age 58 [SD 7] years, BMI ranging from 25-40kg/; 25 females) were included. HGU was measured by positron emission tomography during the hyperinsulinemic-euglycemic clamp. EGP was calculated by subtracting the glucose infusion rate during clamp from the glucose rate of disappearance. SB and PA were measured with hip-worn accelerometers (26 [SD3] days). Fitness was assessed by maximal bicycle ergometry with respiratory gas measurements and dietary intake of nutrients by 4-day food diaries. HGU was not associated with fitness or any of the SB or PA measures. When adjusted for sex, age, and body fat-%, HGU was associated with whole-body insulin sensitivity (β=0.58), water-insoluble dietary fiber (β=0.29), energy percent (E%) of carbohydrates (β=-0.32), saccharose (β=-0.32), mono- and polyunsaturated fatty acids (β=0.35, β=0.41, respectively). EGP was associated with whole-body insulin sensitivity (β=-0.53), and low-density lipoprotein cholesterol [β=-0.31], and when further adjusted for accelerometry wear time, EGP was associated with standing [β=-0.43]. (p-value for all< 0.05). Standing more, consuming a diet rich in fiber and unsaturated fatty acids, and a lower intake of carbohydrates, especially sugar, associate beneficially with hepatic insulin sensitivity. Habitual SB, PA, or fitness may not be the primary modulators of HGU and EGP. However, these associations need to be confirmed with intervention studies.

Increasing the content of fiber and minerals in gnocchi with added dragon fruit peels as sub stitution of ingredient for improvement of food product quality and human health

Gnocchi is a type of homemade pasta made from potatoes, flour and eggs. Improving food product quality in terms of nutrition in gnocchi products it is possible now also use food waste. In addition to improvement of food product quality and human health, the addition of dragon fruit peel, which is considered as waste, can provide reasonable solutions or ideas about recycling of food waste. In this study, the produced food product was gnocchi with addition of by-product — dragon fruit peel, which was tested for fiber content and content of the following minerals: iron, potassium, calcium. The data obtained were then analyzed statistically by the SPSS program to determine the effect of variation using the T-test. Based on the results of the study it was concluded that the content of dietary fiber of dragon fruit peel in the sample of gnocchi denoted as F3 featured the highest water-soluble dietary fiber content with a score of 1.33%, water insoluble dietary fiber content with a score of 1.86%. and total dietary fiber content with a score of 3.19%. This also shows that the more dragon fruit peel is added, the higher is the total dietary fiber content in gnocchi with addition of dragon fruit peel. This high dietary fiber will be beneficial to humans, especially good for the digestive system. Meanwhile, the mineral content of gnocchi with dragon fruit peel also showed that the F3 sample had the highest mineral content, in particular — iron (Fe) in amount of 1.886 mg/100 g, potassium (K) 6.179 mg/100 g, and calcium (Ca) in amount of 25.339 mg/100 g. This also shows that the addition of dragon fruit peel is useful for improvement of human health and the quality of food product, i. e. gnocchi by increasing the total content of dietary fiber and improving the mineral composition of gnocchi due to addition of dragon fruit peel.

Effects of two celery fibers on the structural properties and digestibility of glutinous rice starch: A comparative study

The present study focused on the extraction of water-soluble dietary fiber (CSDF) and water-insoluble dietary fiber (CIDF) from celery. It investigated their effects on glutinous rice starch's (GRS) physicochemical, structural, and digestive properties. The results showed that as the addition of the two dietary fibers increased, they compounded with GRS to varying degrees, with the complexing index reaching 69.41 % and 60.81 %, respectively. The rheological results indicated that the two dietary fibers reduced the viscosity of GRS during pasting and inhibited the short-term regrowth of starch. The FTIR and XRD results revealed that the two fibers interacted with GRS through hydrogen bonding, effectively inhibiting starch retrogradation. Furthermore, both fibers increased the pasting temperature of GRS, thus delaying its pasting and exhibiting better thermal stability. Regarding digestibility, the starch gels containing dietary fibers exhibited significantly reduced digestibility, with RS significantly increased by 8.15 % and 8.95 %, respectively. This study provides insights into the interaction between two dietary fibers and GRS during processing. It enriches the theoretical model of dietary fiber-starch interaction and provides a reference for the application development of starch-based functional foods.

Evaluation of Physical Characteristics, Carbohydrate Content, and Sensory Preference of Suwar-suwir Caisim

Suwar-suwir is Jember-Indonesia’s traditional snack made from cassava fermented (tape) and sugar which give rises to very sweet flavor and sticky texture, causing consumer disfavor. This study aimed to determine the amount of mustard caisim powder added for fixing suwar-suwir texture, color and its sensory preference. This complete randomized controlled design tested effects of 6 level mustard caisim powder addition (Control=K=0, SF1=17, SF2=25, SF3=33, SF4=42, SF5=50%) toward suwar-suwir quality and sensory preference. The result showed that the addition significantly (P&lt;0.05) affected physical properties and carbohydrate level (Fc&gt;Ftab), and sensory liking preference (X2c &gt;X2tab). The higher the addition of mustard caisim powder, the lower the texture value, the lower the color, the higher carbohydrate content. Suwar-suwir produced with 17% mustard caisim powder (SF1) has the best color, flavor, and overall performance. This suwar-suwir SF1 having more crunchy dense (163.2±4.80 mm/g.s,) more light green (29.59±0.29), high carbohydrate level (81.59±0.96%), high dietary fiber-TDF (20.8±0.01%), water soluble dietary fiber- SDF (6.29±0.002%) that lower than water insoluble dietary fiber - IDF (14.2± 0.01%). Based on the result analysis, it is recommend that the level addition of mustard caisim powder for improving suwar-suwir quality and image is 17 % from wet blend dough weight which produced suwar-suwir caisim SF1.

Amorphisation and chain length reduction of cellulose affect its impact on the water distribution, dough rheology and loaf volume in bread making

The unfermentable nature of cellulose limits its physiological benefits as a dietary fibre. Recently, we drastically increased the fermentability of microcrystalline cellulose by human colon microbiota by reducing its crystallinity and polymer chain length (Thielemans et al., 2023). Here, the techno-functional impact of incorporating amorphised cellulose, depolymerised cellulose and amorphised depolymerised cellulose on bread making is investigated. Microcrystalline cellulose and its modified counterparts could be incorporated into bread at a 5 w/w% substitution level without significant volume losses. At a 20 w/w% substitution level, microcrystalline cellulose incorporation caused a loss of 36.4 ± 2.9% in bread loaf volume, while depolymerised celluloses reduced bread volume much less (16.2 ± 1.9%). In-depth characterisation of cellulose samples and 1H NMR and rheological measurements on bread dough revealed that the modified celluloses affected the water balance and gluten hydration in dough less than microcrystalline cellulose. These results complement insights on the importance of water-insoluble dietary fibre structure and hydration behaviour on bread (dough) quality.

Insight into the mechanism of water-insoluble dietary fiber from star anise (Illicium verum Hook. f.) on water-holding capacity of myofibrillar protein gels

This study aimed to determine the efficacy of star anise dietary fiber (SADF) in alleviating the oxidative damage of myofibrillar protein (MP) from the perspective of volatile components. SADF and SADF without essential oils (EOs) (NSADF) were added to oxidized MP. The addition of NSADF and SADF improved the water-holding capacity (WHC) and gel strength, with the 0.4% addition showing the highest values. Moreover, the WHC of MP from the SADF-treated group was significantly higher than that from the NSADF-treated group at the same dosage, suggesting that EOs in SADF improved the WHC through antioxidation. EOs in SADF prevented the attack of hydroxyl radicals on MP, increasing the β-sheet level and decreasing the random coil level, which was supported by the results of FT-IR, carbonyl content, and sulfhydryl content. Limonene and anisaldehyde present in EOs played an antioxidant role, and anisaldehyde could scavenge free radicals through demethoxylation.

Using cereal to increase dietary fiber intake to the recommended level and the effect of fiber on bowel function in healthy persons consuming North American diets

Background:Dietary fiber intake remains low despite increasing evidence for its health benefits, including laxation. Objective:We aimed to assess the effects of increasing fiber intake on bowel habits and gastrointestinal tolerance in healthy persons consuming a typical Canadian or US diet. Design:Under a randomized crossover design, 23 free-living participants consumed a typical Canadian or US diet (35% fat, 12 g fiber/d) and received 25.0–28.7 g fiber/d from each of 5 breakfast cereals: All-Bran (AB), Bran Buds with Corn (BBC), Bran Buds with Psyllium (BBP), BBC with viscous fiber blend (VFB), or a low-fiber control for 3 wk, with each study arm separated by a washout of ≥1 wk. Seven-day stool collections and a symptom diary were obtained during the last week of each study arm. Results:All study cereals induced significant (P < 0.05) increases in fecal bulk from the control diet at 128 ± 38 g to 199 ± 56, 199 ± 57, 247 ± 87, and 197 ± 63 g with consumption of AB, BBC, BBP, and VFB, respectively; less intestinal transit time; and significantly (P < 0.05) greater bowel movement frequency. Despite the increased activity of the bowel, a positive level of comfort was maintained. BBP was more effective than other cereals in terms of increasing fecal wet weight (P < 0.05). Conclusion:Water-insoluble dietary fibers (ie, AB and BBC) and their mixtures with water-soluble fibers (ie, BBP and VFB) in the form of breakfast cereals (2.5 servings/d) proved to be a practical way of increasing fiber intake to recommended levels, while maintaining a good level of tolerance.

The effect of water-insoluble dietary fiber from star anise on water retention of minced meat gels

The mechanism of star anise dietary fiber (SADF) in improving the water-holding capacity (WHC) of meat batter during chilled storage was investigated. In the 0-day storage group, the cooking loss (CL) decreased from 11.93% to 9.38% with the increased content of SADF, indicating that the physical filling of SADF could improve the WHC of cooked meat batter. After 7 days of chilled storage, the CL of meat batter without SADF increased from 11.93% to 17.65%, while the addition of SADF significantly reduced the CL, especially 2% SADF showing the lowest CL. Additionally, adding SADF could significantly improve the color stability and increase the hardness of cooked meat batter. According to the results of TBARS and carbonyls, SADF significantly inhibited lipid oxidation and alleviated oxidative damage of protein, resulting in an increase in the level of β-sheet, which was confirmed by the result of FT-IR. Therefore, the water mobility of meat batter was restricted, which was confirmed by the T2 relaxation time. In general, the water retention of meat batter during chilled storage was improved via antioxidant and physical filling of SADF.

Insoluble Dietary Fibers From By-Products of Edible Fungi Industry: Basic Structure, Physicochemical Properties, and Their Effects on Energy Intake.

With the rapid development of the edible fungi industry in the world, especially in China, the resource utilization of edible fungi by-products has become an urgent problem for the industry's sustainable development. The waste residue of edible fungi after polysaccharide extraction by water accounts for a large proportion, which contains a large amount of water-insoluble dietary fiber (IDF). At present, the extracted residue is generally treated as fertilizer or solid waste, which not only pollutes the environment, but wastes resources too. In order to develop these by-products, expand their potential utilization in the food industry, the structure characterization, physicochemical properties, and the influence of IDF on dietary energy intake were studied. The IDF from the residues of polysaccharides extracted from four edible fungi was extracted using the Association of Official Analytical Chemists (AOAC) method. The results showed that IDF in the four kinds of edible fungi residues was similar in composition but different in texture. Cellulose and hemicellulose are the main IDF extracted from four kinds of edible fungi. Among them, Hericium erinaceus is the softest without obvious granular texture, following Lentinus edodes, while Ganoderma lucidum and Grifola frondosa have a relatively hard texture. The yield of four kinds of IDF from high to low came from Ganoderma lucidum, Hericium erinaceus, Lentinus edodes, and Grifola frondosa. Fourier transform IR (FTIR) and X-ray diffraction (XRD) spectra showed that the four IDFs had similar functional groups and all of them contained a large amount of cellulose. Physical and chemical analysis showed that all the four IDFs had certain water holding capacity, water binding capacity, and oil holding capacity. In-vitro digestion experiments showed that the four IDFs could inhibit the digestion of starch and fat to a certain extent. By-products of edible fungi are an ideal material for the recovery of IDFs, which have the potential to be processed into functional food materials due to their physicochemical properties and physiological functions.

Ultra-high Pressure Treatment Controls In Vitro Fecal Fermentation Rate of Insoluble Dietary Fiber from Rosa Roxburghii Tratt Pomace and Induces Butyrogenic Shifts in Microbiota Composition.

Dietary fiber has been considered a key element in shaping the beneficial host-microbe symbiosis. In the present study, we identified Rosa roxburghii Tratt fruits as a promising dietary fiber source. The physicochemical properties and in vitro fermentability by human fecal microbes of R. roxburghii pomace water insoluble dietary fiber (RIDF) obtained from ultrasonic extraction and ultrahigh pressure (90 MPa)-treated RIDF (RIDF-90) were compared to those of R. roxburghii Tratt pomace (R). Ultrahigh pressure modification significantly increased the water holding, oil holding, and swelling capacity of RIDF-90 in comparison to R and RIDF. RIDF-90 displayed the slowest fermentation rate yet yielded the highest butyrate production. The superior butyrogenic properties of both RIDF-90 and, in part, RIDF were reflected by increased Coprococcus and Ruminococcus levels, demonstrating that ultrasonic extraction and/or further ultrahigh pressure treatment of insoluble fibers promotes the prebiotic value of R. roxburghii Tratt.

Physico-chemical properties of reduced-fat biscuits prepared using O/W cellulose-based pickering emulsion

This study was aimed at evaluating the potential of oil-in-water (O/W) Pickering emulsions stabilized with dietary fibers as fat substitutes to prepare low-calorie baked foods. The chewy biscuits were used as a research model to evaluate the feasibility of Pickering emulsions with different oil phase volume fractions (10%–50%) as fat substitutes. The dough mixing characteristics and biscuit quality with different fat replacement rates (0%–90%) were assessed. The bacterial cellulose (BC) and bamboo shoot water-insoluble dietary fiber (BSDF) were used to provide good stabilization of O/W emulsions against coalescence over a period of one month. In the reduced-fat doughs, dietary fiber increased the viscoelasticity of the dough by altering the gluten network structure and forming a discontinuous, irregular matrix. The overall appearance and texture of the biscuits were better when the fat replacement rate was 35%. Moreover, the reduced fat energy was 12.5 kJ/g, and the amount of dietary fiber increased to 1.05 mg/g. The fingdings might expand the potential application of Pickering emulsion stabilized with dietary fibers as fat substitutes in the development of low-fat baked foods.

Impact of wheat bran micronization on dough properties and bread quality: Part I – Bran functionality and dough properties

This study aimed to investigate the effect of wheat bran micronization on its functionality including physicochemical and antioxidant properties, and dough properties. Coarse bran (D50 = 362.3 ± 20.5 μm) was superfine ground to medium (D50 = 60.4 ± 10.1 μm) and superfine (D50 = 11.3 ± 2.6 μm) bran, accompanied with increasing specific surface area and breakdown of aleurone layers. Bran micronization increased its soluble dietary fibre content, ferulic acid liberation, and antioxidant properties including total polyphenol content, ABTS•+ and DPPH• scavenging activities, while decreased its water retention capacity and insoluble dietary fibre content. Moreover, bran micronization impacted dough rheological properties. The dough with superfine bran had higher water absorption and gelatinization temperature, peak viscosity, final viscosity and setback value, lower stability time, resistance to extension, and extensibility than the dough with coarse bran. This dough furthermore exhibited more solid-like properties characterized by decreased loss moduli and frequency dependence (n’).

Water-insoluble dietary fibers from oats enhance gel properties of duck myofibrillar proteins

The effects of different particle sizes (90-µm and 200-µm) and contents (1.5% and 3%) of water-insoluble dietary fibers (IDF) on the gelation properties of duck myofibrillar protein (MP) were explored. The results showed that the addition of IDF improved the gel strength and water holding capacity of MP compared with the control (P < 0.05). IDF reinforced the formation of network structure and the viscoelasticity of gel; 1.5% 200-µm IDF reached the maximum among these treatments. PT21 of the gel with IDF was higher than that of the control (P < 0.05), revealing that the addition of IDF accelerated the transformation of free water into immobilized water within the gel matrix. An ordered flaky gel network with small water holes was responsible for the increase of fractal dimension of the gel with IDF. Water distribution and viscoelasticity are the critical factors that IDF affects the gel properties of duck MP.

반응표면분석법을 이용한 천년초 줄기로부터 식이섬유소 추출을 위한 효소처리 조건의 최적화

This study aimed to optimize the hydrolysis conditions required for extraction of dietary fiber from Opuntia humifusa stem using Viscozyme® (MilliporeSigma, St. Louis, MO, USA) with response surface methodology (RSM). A central composite design was applied to examine the effects of the independent variables, enzyme concentration (0.5-2.5%, X1) and reaction time (1-5h, X2). The hydrolysis conditions were optimized using total yield, total dietary fiber (TDF), water-soluble dietary fiber (SDF), and water-insoluble dietary fiber (IDF) contents of hydrolysates as dependent variables. The total yield was 39.9-53.2% and the coefficient (R2) of the derived equation from the response surface regression for total yield was 0.9073. The TDF and SDF contents in all hydrolysates were 29.02-43.82% and 27.25-40.68%, respectively, which were within the 1% level. The IDF contents in all hydrolysates were 0.98-3.80% (R2 0.8886) and with in 5% significance. The optimal hydrolysis conditions comprised 1.0-1.8% Viscozyme® and an incubation period of 1.0-1.8 h. Our results suggested that O. humifusa could be a source that might extend the application of dietary fiber in functional food industries.

AgNAC1, a celery transcription factor, related to regulation on lignin biosynthesis and salt tolerance

The NAC transcription factor participates in various biotic and abiotic stress responses and plays a critical role in plant development. Lignin is a water-insoluble dietary fiber, but it is second only to cellulose in abundance. Celery is the main source of dietary fiber, but its quality and production are limited by various abiotic stresses. Here, AgNAC1 containing the NAM domain was identified from celery. AgNAC1 was found to be a nuclear protein. Transgenic Arabidopsis thaliana plants hosting AgNAC1 have longer root lengths and stomatal axis lengths than the wide type (WT). The evidence from lignin determination and expression levels of lignin-related genes indicated that AgNAC1 plays a vital role in lignin biosynthesis. Furthermore, the results of the physiological characterization and the drought and salt treatments indicate that AgNAC1-overexpressing plants are significantly resistive to salt stress. Under drought and salt treatments, the AgNAC1 transgenic Arabidopsis thaliana plants presented increased superoxide dismutase (SOD) and peroxidase (POD) activities and decreased malondialdehyde (MDA) content and size of stomatal apertures relatively to the WT plants. The AgNAC1 served as a positive regulator in inducing the expression of stress-responsive genes. Overall, the overexpressing AgNAC1 enhanced the plants' resistance to salt stress and played a regulatory role in lignin accumulation.

Extraction of Insoluble Dietary Fibre from Date (&lt;em&gt;Phoenix dactylifera&lt;/em&gt;) and its Characterization

In the present study our aim was to extract water insoluble dietary fibre from the date fruit using microwave assisted heating. Physicochemical properties, rheological behavior, elemental analysis, FTIR and, SEM of fibre were determined. Particle size was in the range of 800–1067 nm. Elemental analysis of water insoluble fibre confirms the presence of protein and absence of sugar. Extracted dietary fibre has excellent oil and water holding capacity. FTIR confirms the presence of polysaccharides, cellulose, hemicelluloses and amides which indicate the presence of protein in fibre sample. Atomic absorption spectroscopic study confirmed the existence of higher amount of calcium, magnesium, manganese, iron, zinc, phosphorous, but absence of sodium.

The mixture of soybean powder and dragon fruit peel powder as high fiber functional drink

Dietary fiber intake provides many health benefits. Individuals with low intakes of dietary fiber appear to be at significantly higher risk for stroke, obesity, diabetes,hypertension, certain gastrointestinal diseases, and coronary heart disease. Functional drink with higher fiber is expected to increase fiber intake in society. The aims of the research is to investigated the charateristic of the mixture of of soybean powder and dragon fruit peel powder as functional drink. All experiment were designed in complete random. Dragon fruit peel powder and soy powder were mixed according to the treatments. The result showed that dragon fuit peel powder give higher water content, soluble, insoluble and total dietary fiber. Moreover the color functional drink from dragon fuit peel powder have darker and red color..

Water-insoluble dietary fibers from bamboo shoot used as plant food particles for the stabilization of O/W Pickering emulsion

In this work, water-insoluble bamboo shoot dietary fiber (BSDF) was prepared, and used as plant food particle stabilizer for oil-in-water (O/W) Pickering emulsions. The obtained plant food particle had novel emulsification ability, the prepared emulsions were stable against coalescence for at least 4 weeks and also insensitive to pH, ionic strength and pasteurization conditions. The BSDF suspensions and BSDF-stabilized O/W emulsions both exhibited shear-thinning behaviors; moreover, both viscosity and module were increased with the increase of BSDF contents. The surface coverage of emulsions was positively correlated with the content of BSDF suspensions. It indicated that the dietary fibers from bamboo shoot had a soft nature and suitable shape to produce stable Pickering emulsions, which could be used as food-grade particles for applications of food and cosmetics industries.

Water-insoluble dietary-fibers from Flammulina velutiper used as edible stabilizers for oil-in-water Pickering emulsions

In this work, the physicochemical properties and emulsification performance of water-insoluble dietary-fibers (IDF) from Flammulina velutiper treated with high pressure homogenization were investigated. The homogenization resulted in the breakdown of fibers in the water-insoluble dietary-fibers, and subsequently water-insoluble dietary-fibers with the average width of about 24 nm and height of 4 nm was obtained. The obtained water-insoluble dietary-fibers not only had increased water holding capacity and stability when compared with that of the untreated sample, but also had improved interfacial properties. The water-insoluble dietary-fibers could be irreversibly adsorbed at oil-water interface, exhibiting an outstanding emulsification performance. The temperature, pH and ionic strength had little influence on the stability of the stabilized emulsions. The results would be of importance for the development of a kind of food-grade nanoparticles to perform as outstanding Pickering stabilizers for emulsions, which had great application prospects in food, cosmetics and pharmaceutical fields.