Simulated Gastrointestinal Tract Research Articles

Isolation and in vitro investigation on lactic acid bacteria for potential probiotic properties from cat feces.

Probiotics, which are beneficial to the host, have been shown to benefit the health of cats. Lactic acid bacteria (LAB) are commonly used probiotics, but most strains used for cats are not derived from cats, leading to reduced efficacy and poor adaptation to cats. The objective was to identify LAB with promising probiotic potential specific to cats. LABs were isolated from fecal samples of 20 healthy cats. Gram staining and the survival rate in the simulated gastrointestinal tract were used for preliminary screening. Candidate strains were identified by 16S rDNA sequencing, and further evaluated for adhesion ability, growth characteristics, antibacterial activity, antioxidant capacity, and safety. 24 Gram-positive isolates were identified, with 10 (F1-F10) showing robust viability in the simulated gastroenteric fluid. These 10 strains exhibited excellent adhesion to Caco-2 cells and strong auto-agglutination properties. They also possessed the capacity to antagonize and aggregate pathogens (Staphylococcus aureus ATCC 25923, Salmonella Braenderup H9812, Escherichia coli ATCC 25922, and Pseudomonas aeruginosa PAO1), Moreover, all strains demonstrated tolerance to H2O2 concentrations ranging from 0.5-2 mmol/L and the ability to scavenge 1, 1-diphenyl-2-picrylhydrazyl (DPPH) free radicals, indicating a certain level of antioxidant activity. Safety tests showed no hemolytic activity, and all but F6 were highly sensitive to antibiotics, with over 62.5% sensitivity to 16 antibiotics. Remarkably, F4 (Lactobacillus reuteri) and F10 (Lactobacillus brevis) exhibited exceptional viability in the simulated gastrointestinal tract, coupled with robust growth potential, enhanced adhesion efficiency, significant antibacterial and antioxidant properties. Our findings revealed that F4 (Lactobacillus reuteri) and F10 (Lactobacillus brevis) hold promising potential as probiotics. This research lays a solid scientific foundation for the selection and application of probiotics tailored specifically for cats.

Modeling the behavior of probiotic strains in foods under simulated gastrointestinal tract conditions

This study aimed to estimate the survival of two Weizmannia coagulans and a Lacticaseibacillus paracasei probiotic strain under simulated gastrointestinal conditions using different food matrices (a Brazilian processed cheese – “requeijão cremoso," orange juice, and homemade bread). The probiotic Weizmannia strains remained stable throughout digestion, showing good resistance to solutions of the gastrointestinal tract. Lacticaseibacillus paracasei PXN 37 showed inactivation kinetics with a good model fit (R2>0.90) at pH 1 in orange juice, cream cheese and when inoculated purely directly in the gastric solution, when the counts of this strain were < 6 log CFU/g in both foods studied. In the other pH conditions evaluated (pH 2-4), the reductions in the populations of the probiotic strains did not impair their viability at the end of gastric digestion, as counts were always >6 log CFU/g or mL. Orange juice and processed cheese could be considered as viable food matrices for the application of probiotics. The modeling approach employed herein highlights the potential of this approach to screen suitable strains for the best dose adjustment, to use different probiotic strains in food formulations, to identify the conditions that inhibit/delay their growth, and to ascertain the limiting factors for the shelf life of the probiotic products.

Development and characterization of microencapsulated Pichia kluyveri CCMA 0615 with probiotic properties and its application in fermented beverages

The study aimed to develop innovative microencapsulated formulations of strains with probiotic attributes, Pichia kluyveri CCMA 0615 and Saccharomyces cerevisiae CCMA 0732. The yeasts (8 log CFU/mL) were microencapsulated by spray drying technique using whey powder (WP - 15 %, 20 %, and 30 %) and sodium alginate (ALG - 1 %). The microcapsules and cell viability were characterized during two months of storage (4 °C and 25 °C). The selected formulations were applied to functional beverage fermentation, and viability and survival in the simulated gastrointestinal tract (GIT) were performed. The viability of yeasts microencapsulated by the spray drying method was shown to be dependent on the strain and encapsulating matrix used, ranging from 84 to 99 %. P. kluyveri required refrigeration when storing microcapsules. In functional beverage fermentation, microencapsulated yeast maintained the same fermentative profile with carbohydrate consumption, production of lactic acid (0.30 to 1.10 g/L) and alcohol (0.2 to 1.61 g/L), and greater viability during storage. Finally, the microencapsulation of P. kluyveri with 15 % WP + 1 % ALG maintained high viability under GIT conditions, whether exposed independently (>84 %) or incorporated into a food matrix (>94 %). The study demonstrated that this innovative microencapsulation of probiotic yeasts increases their viability, improves biotechnological application, and facilitates efficient delivery of probiotics to the host.

The Public Health Risks of β-Hemolytic Bacillus pumilus Bacteria Resistant to Gastrointestinal Conditions from Medicinal Plant.

In numerous countries, the utilization of plants for both nutritional and therapeutic purposes is a common practice. However, the inadvertent use of these plants can pose risks due to their active molecules or microbiota. The traditional use of Herniaria glabra L. (H. glabra) plant in treating various diseases is well-known; however, its application in yogurt production raises concerns. In this study, Bacillus pumilus isolated from H. glabra was identified through 16s rRNA sequencing and MALDI-TOF MS (Matriks Assisted Lazer Desorption Ionization Time of Flight Massspectrometry). The bacterium's resistance under simulated gastrointestinal tract (GIT) conditions was assessed, followed by investigations into its aggregation ability, antibiotic resistance, hemolytic activity, and antagonistic potential through in vitro tests. The study revealed that B. pumilus exhibited 100% resistance to GIT conditions. Notably, the bacterium demonstrated strong autoaggregation (34.48%) and coaggregation abilities (49.82% for Escherichia coli, 49.13% for Listeria monocytogenes), signifying a potent aggregative potential. Sensitivity to most tested antibiotics was observed, while no antagonistic activity against tested bacteria was evident. Furthermore, the bacterium exhibited β-hemolytic activity, indicative of potential virulence. The findings suggest that this resistant yet virulent bacterium, with its hemolytic activity, could disrupt the GIT balance, posing serious health risks. The study underscores the need for caution and awareness regarding the potential dangers posed by bacteria in plant microbiota in herbal therapies.

Enhancing the functionality of yogurt: Impact of exotic fruit pulps addition on probiotic viability and metabolites during processing and storage

The effect of exotic fruit pulp (araçá, cagaita, cambuci, grumixama, blueberry, and uvaia) on probiotic viability during storage and after gastrointestinal tract (GIT) simulation, in vitro biological activity, total phenolics (TPC) and flavonoids content, and the production of metabolic products of microbial in probiotic yogurt were investigated. During the storage period (28 days), probiotic strain populations remained high (above 6 log CFU/g), while after the GTI simulation, L. acidophilus and B. animalis survival rates were higher when adding grumixama, blueberry, and uvaia pulp. Fermentation increased the antioxidant activity of yogurt containing araçá (12.87 ± 0.32 to 17.46 ± 1.79 μg Trolox/mg) and blueberry pulp (12.05 ± 1.43 to 17.49 ± 1.68 μg Trolox/mg) for ORACH for example. However, the total phenolic content increased in all samples after fermentation (ranging from 1.80 ± 0.26 μg gallic acid/mg (Uvaia) to 2.42 ± 0.08(Grumixama)), and there was no significant difference among treatments for total flavonoids. Thirty-eight metabolic compounds, mainly free amino acids, were detected, indicating a high degree of proteolysis in samples. Exotic fruit pulps positively impacted the probiotic yogurt parameters and are a potential alternative in functional food processing.

Alteration in rheological and digestive properties of O/W emulsions using controlled aggregation of konjac glucomannan and xanthan gum in aqueous phases

The modulation of lipid digestion and emulsion stability remains a pivotal area of research, crucial for developing healthier food products with enhanced sensory and nutritional attributes. This study investigates the influence of konjac glucomannan (KGM) and xanthan gum (XG) on oil-in-water (O/W) emulsions throughout simulated gastrointestinal tract (GIT) digestion, focusing on rheological properties, microstructure evolution, and lipid release kinetics. Three distinct O/W emulsions were formulated with 20 wt% oil content, incorporating either 0.8 wt% XG, a 1:1 mixture of KGM and XG (KGM/XG), or a blend of KGM-XG. Rheological assessments revealed all emulsions exhibited shear-thinning behavior across applied shear rates (0.1–100 1/s). During gastric and small intestinal digestion phases, the KGM-XG emulsion exhibited significantly higher viscosity at higher shear rates (2.512–100 1/s), indicating robust molecular interactions between KGM and XG under digestive conditions. The analysis of microstructure, particle size, and flow behavior showed that the KGM-XG emulsion exhibited significantly (p < 0.05) higher viscosity and smaller particle sizes compared to other systems throughout the digestion process. This finding indicates that KGM-XG emulsion demonstrates a strong resistance to enzymes and digestive fluid during the transition from oral to small intestinal phases. Importantly, the extent of free fatty acid (FFA) release at the end of the small intestinal phase was highest for XG (34.4%), followed by KGM/XG (15.65%) and KGM-XG (13.23%). These findings highlight the potential of KGM-XG emulsions to modulate lipid digestion kinetics, offering applications in designing emulsion-based foods, such as sauces, beverages, and reduced-fat foods.

In vitro validation of colon delivery of vitamin B2 through a food grade multi-unit particle system.

Colon target delivery of active ingredients is frequently applied in pharmaceutical products. However, in functional food and beverage applications, dietary supplements, and medical nutrition, formats targeting colonic delivery to improve human health are rare. Nevertheless, there is emerging evidence for beneficial effects of colonic delivered nutrients on gut microbiota and host health which increases the demand for sustainable food grade materials that are regulatory approved for application. In this paper, we describe a double layer coated multi-unit particle system (MUPS) with a diameter of approximately 730 microns consisting of food grade materials: shellac as outer layer, alginate as inner layer, cellulose as a core and riboflavin as active ingredient. The suitability of the MUPS for colonic delivery was tested in three well-established in vitro digestion and fermentation models: the USP Apparatus 3 and the TNO Intestinal Models 1 and 2 (TIM-1 and TIM-2). All systems confirmed the integrity of the MUPS under simulated upper gastrointestinal tract conditions with approximately 90% of the active ingredient being released under simulated ileal-colonic conditions. The TIM-2 model also showed the effects of riboflavin loaded MUPS on the microbiome composition with an increase in the production of short-chain fatty acids, acetate and butyrate. The results of these experiments provide a reliable basis for validation of this vitamin-loaded food grade MUPS in future human clinical trials. In addition, following the recent announcement of the European Commission to restrict intentionally added microplastics to products, the materials used in the described formulation offer an environmentally friendly alternative to often applied methyl acrylate based coatings.

The Effect of Multilayer Nanoemulsion on the In Vitro Digestion and Antioxidant Activity of β-Carotene.

The objectives of this study were to design multilayer oil-in-water nanoemulsions using a layer-by-layer technique to enhance the stability of β-carotene and evaluate its effect on in vitro release and antioxidant activity. To prepare β-carotene-loaded multilayer nanoemulsions (NEs), a primary NE (PRI-NE) using Tween 20 was coated with chitosan (CS) for the secondary NE (SEC-CS), and with dextran sulfate (DS) and sodium alginate (SA) for the two types of tertiary NEs (TER-DS, TER-SA). The multilayer NEs ranged in particle size from 92 to 110 nm and exhibited high entrapment efficiency (92-99%). After incubation in a simulated gastrointestinal tract model, the release rate of free fatty acids decreased slightly after coating with CS, DS, and SA. The bioaccessibility of β-carotene was 7.02% for the PRI-NE, 7.96% for the SEC-CS, 10.88% for the TER-DS, and 10.25% for the TER-SA. The 2,2-diphenyl-1-picrylhydrazyl radical scavenging abilities increased by 1.2 times for the multilayer NEs compared to the PRI-NE. In addition, the cellular antioxidant abilities improved by 1.8 times for the TER-DS (87.24%) compared to the PRI-NE (48.36%). Therefore, multilayer nanoemulsions are potentially valuable techniques to improve the stability, in vitro digestion, and antioxidant activity of β-carotene.

Assessment of the Interaction of Acetylcholinesterase Binding with Bioactive Compounds from Coffee and Coffee Fractions Digested In Vitro in the Gastrointestinal Tract.

The aim of the study was to evaluate the degree of acetylcholinesterase (AChE) inhibition by green and light- and dark-roasted coffee extracts and their fractions after digestion in a simulated gastrointestinal tract. The analysis was carried out using isothermal titration calorimetry, molecular docking, and dynamics simulations. The results showed that 3-O-caffeoylquinic acid binds strongly to AChE through hydrogen interactions with the amino acids ARG289A, HIS440A, and PHE288A and hydrophobic interactions with TYR121A in the active site of the enzyme. The Robusta green coffee extract (ΔG = -35.87 kJ/mol) and dichlorogenic acid fraction (ΔG = -19-29 kJ/mol) showed the highest affinity. Dichlorogenic acids (3,4-O-dicaffeoylquinic acid, 4,5-O-dicaffeoylquinic acid, and 3,4-O-dicaffeoylquinic acid) have high affinity for AChE as single compounds (ΔG(ITC) = -48.99-55.36 kJ/mol, ΔG(LF/AD) = -43.38-45.38 kJ/mol). The concentration necessary to reduce AChE activity by 50% amounted to 0.22 μmol/μmol chlorogenic acids to the enzyme.

Assessment of Potential Probiotic Yeasts Isolated from The Small Intestines of Cattle in Thailand

Y easts are widely studied and considered good candidates for probiotics due to their numerous benefits. This study aimed to investigate potential probiotic attributes of yeasts isolated from the small intestines of cattle in Thailand. Growth at body temperature, resistance to low pH, auto-aggregation capability, hydrophobicity, growth under gastrointestinal tract (GIT) conditions, safety profiles, antimicrobial activity, and extracellular enzyme production of yeast strains were evaluated in vitro. The results of sequential screening indicated that 829 out of 1,025 yeast strains could grow at both 37 and 39 °C, 682 strains could resist acidity at pH 2 for 24 h, 252 strains revealed greater than 83% auto-aggregation capability, and 97 strains showed higher than 90% hydrophobicity. Sixty strains grew well under simulated GIT conditions in the presence of pepsin, pancreatin, and bile salts. Thirteen strains of Diutina rugosa showed negative results for hemolytic, gelatinase, and phospholipase activities, while seven strains of Pichia kudriavzevii also showed negative results for the above activities, except for phospholipase. Neither D. rugosa nor P. kudriavzevii inhibited Escherichia coli, Staphylococcus aureus and Pseudomonas aeruginosa. Additionally, 12 strains of D. rugosa and four strains of P. kudriavzevii produced phytase and cellulase, while only D. rugosa PCD3-6 exhibited protease and phytase activities. Therefore, D. rugosa (strains PCD3-6, PCD93-19, PYJ93-7, PYJ93-16, PCJ94-4, PCJ94-6, PCJ94-10, PYD100-8, CTD93-1, CTD93-2, CTJ93-5, CTJ93-6, and YTJ97-4) and P. kudriavzevii (strains PYI3-3, PCI3-4, PCJ90-7, and PYI91-15) were proposed as potential probiotic yeasts. They may be beneficially applied as feed additives to improve nutritional value and quality, thereby enhancing animal performance and health. Moreover, this work indicated useful preliminary results that could be a baseline for future research in human probiotic applications.

Construction of biopolymer-based hydrogel beads for encapsulation, retention, and colonic delivery of tributyrin: Development of functional beverages (fortified bubble tea)

Tributyrin (TB) can be hydrolyzed into short chain fatty acids (butyric acid) in the gastrointestinal tract, which are claimed to exhibit beneficial health effects in the colon. However, digestion of tributyrin in the stomach and small intestine may promote its absorption in the upper gastrointestinal tract, thereby reducing its potential colonic health benefits. In this study, we therefore developed a novel method of encapsulating emulsified tributyrin within biopolymer-based hydrogel beads (≈ 800 μm) that were then encapsulated inside the boba beads (≈ 8–10 mm) found in bubble tea. The hydrogel beads were designed to retain and protect the tributyrin under upper gastrointestinal tract (GIT) conditions, but then release it within the colon. The concentration of tributyrin within the boba beads was 33.3 mg/g, which is above the value reported to exhibit health benefits. The morphology, encapsulation properties, water holding capacity, stability, and swelling properties of the tributyrin-loaded boba beads were characterized. Tapioca-based beads exhibited a larger degree of swelling when incubated in water for 12h (>95 %), whereas agar-based beads did not (< 20 %). In addition, the potential gastrointestinal fate of both free and encapsulated tributyrin oil droplets was assessed using an in vitro digestion model. The free tributyrin oil droplets were almost completely hydrolyzed (103.2 %) by the end of the small intestine phase, whereas the tributyrin oil droplets encapsulated within the agar-based (29.4 %) or tapioca-based (40.3 %) boba beads were much more resistant to digestion. The tapioca-based beads were partially broken down as they passed through the simulated GIT, while the agar-based beads maintained their structural integrity. The tapioca-based beads were gradually broken down as they passed through the simulated GIT, while the agar-based ones maintained their structural integrity. Agar beads were also harder, more resilient, and chewier than the tapioca ones. Both types of boba beads tended to swell and disintegrate when heated to high temperatures (90 °C), with the effect being more pronounced for the agar beads. Overall, our results suggest that the agar-based boba beads had greater potential for the delivery of tributyrin to the colon than the tapioca-based ones. The recent popularity of bubble tea means that it may be a suitable vehicle for delivering bioactive food components, like functional lipids, vitamins, nutraceuticals, or probiotics.

Characterization of two potential probiotic strains of Levilactobacillus brevis isolated from carp (Cyprinus carpio L.) with strong immunostimulatory activity on pikeperch (Sander lucioperca L.) head kidney cells

Aquaculture is inextricably linked to fish health problems, and the use of probiotic lactic acid bacteria (LAB) makes it possible to reduce losses caused mainly by bacterial pathogens. The aim of the present study was to isolate, characterize and select potential probiotic strains of lactic acid bacteria from the gut of common carp. We focused on obtaining strains that grow well under aerobic conditions to facilitate their future application through feed. After excluding strains with unwanted characteristics in vitro, two isolates of Levilactobacillus brevis were selected for this study. Despite belonging to the same species, the strains were biochemically different. However, both isolates met the in vitro selection criteria for potential probiotics. The tested L. brevis strains showed antagonistic activity against pathogenic bacteria isolated from carp and rainbow trout (Aeromonas hydrophila, Aeromonas salmonicida, Pseudomonas fluorescens, and Acinetobacter junii) and demonstrated co-aggregation ability with pathogens. Both strains tolerated stress well under simulated gastrointestinal tract conditions (i.e., showed acid and bile tolerance) and exhibited auto-aggregation capacity. The tested isolates were nonhemolytic, gelatinase negative and susceptible to most of the antibiotics tested. The cell-free supernatants of both L. brevis isolates exhibited strong immunostimulatory effects on pikeperch head kidney immune cells and immunomodulatory effects on carp immune cells. The results of in vitro tests encourage further research into the probiotic potential of these strains under in vivo conditions.

Characterization of probiotic strains of Bacillus sp. from fermented palm wine (Nypa fructicans sp.) and exploration of cellulolytic potential for use as an addition in animal feed.

The main objective of this study was to assess cellulolytic probiotic strains from traditional fermented beverages such as palm wine in order to supplement the animal feed and strengthen the gut health of the animal for better digestibility and absorption. In the present study, different types of microbes were isolated from traditionally prepared palm wine and analyzed for their probiotic nature. For any microbe to be probiotic in nature, it has to sustain the harsh conditions of the human gastrointestinal tract such as acid tolerance, bile tolerance at the lower range of pH, and other properties like auto aggregation test, cell surface hydrophobicity test with non-polar hydrocarbons for evaluating its capabilities to adhere to the intestinal cells and antimicrobial nature against pathogens. Bacillus mycoides strain PR04 and Bacillus subtilis strain PR21 were found to be resistant to acid and bile in simulated artificial gastrointestinal tract model, found to be than 55% hydrophobic with xylene and n-hexadecane and also showed antimicrobial activity greater towards pathogenic strains like Pseudomonas aeruginosa, Staphylococcus aureus, Candida albicans, and Salmonella typhimurium respectively. The cellulolytic activity of the isolates PR04 and PR21 was evaluated in (0.2-2) % CMC (carboxymethyl cellulose) plate. Bacillus mycoides PR04 and Bacillus subtilis PR21 could degrade carboxymethyl cellulose, filter paper, and sugarcane bagasse. The degradation of sugarcane bagasse was confirmed by Scanning electron microscopy and filter paper degradation after 4days of incubation at 37°C. Cellulase gene of the identified Bacillus sp. strains was amplified by primers CF5'-ACAGGATCCGATGAAAACGGTCAATTTCTATTTT-3' and CR5'-ACTCTCGAGATTGGGTTCTGTTCCCAAT-3'. This study proposes potential probiotic Bacillus mycoides PR04 (Accession no. OR625070) and Bacillus subtilis PR21 (Accession no. OR625072) in the application as an animal feed additive to assist in its digestibility and encourage the gut health.

Comparison of in vitro digestive characteristics of proteins from different sources in simulated elderly gastrointestinal conditions

This study aimed to evaluate the impact of in vitro digestive characteristics of five different protein sources (fish, crab, beef, chicken, and soy) in adults and elderly individuals. Simulated gastrointestinal tract degradation in the elderly significantly reduced the digestibility of all proteins. The Elderly model had difficulties digesting any protein that had a firm structure or was prone to aggregation. Of the five protein types, soy protein was the least easily digested. Ultraviolet spectroscopy and SDS-PAGE analysis revealed that beef and crab proteins contain myoglobin and hemocyanin, respectively, making their structure firm. Simultaneously, alkali-soluble proteins in meat were more likely to be digested by the elderly than salt-soluble proteins. The alkali-soluble protein percentage in fish protein was the highest, including the best in vitro digestion characteristics in the elderly population. This study provides novel and significant recommendations for the elderly's daily intake of various protein sources.

In vitro digestion and fecal fermentation of Tremella fuciformis exopolysaccharides from basidiospore-derived submerged fermentation

Tremella fuciformis polysaccharides (TFPS) belong to natural bioactive macromolecule with both edible and medicinal value, possessing much bioactivities such as anti-tumor, antioxidant, antidiabetics, and immunomodulatory. Currently, the production of TFPS through submerged fermentation (TFPS-1) is gradually replacing the polysaccharides extracted from the fruiting body due to improved fermentation efficiency and reduced separation costs. However, it is still unclear about the effect of TFPS-1 on gastrointestinal digestion and gut microbial fermentation, which is directly related to the function of its biological activity. This study aimed to illustrate the effect of TFPS-1 on digestive process through in vitro digestion and fecal fermentation. TFPS-1 was indigestible during the simulated gastrointestinal tract. But TFPS-1 can be digested by intestinal flora leading to alterations in the total polysaccharides content, molecular weight, and apparent viscosity. Moreover, TFPS-1 regulated the composition of gut microbial, lowering the proportion of Firmicutes to Bacteroidetes and enhancing the abundances of Parabacteroides and Bacteroides. The change of intestinal flora produced more short chain fatty acids and lowered the pH. The KEGG metabolic pathway analysis indicated that TFPS-1 enriched lipid metabolism, glycan biosynthesis and metabolism, and biosynthesis of other secondary metabolites. This study demonstrated that T. fuciformis fermented polysaccharide can be a potential prebiotic to optimize intestinal flora homeostasis and maintain host intestinal health.

Effect of starch molecular weight on the colon-targeting delivery and promoting GLP-1 secretion of starch-lecithin complex nanoparticles

β-lactoglobulin (β-LG) could stimulate enteroendocrine L cells which are located in the colon to secrete glucagon-like peptide-1 (GLP-1) to maintain glycemic homeostasis. In order to ensure that β-LG can intactly arrive in the colon through oral administration, colon-targeting delivery systems should be engineered. In this study, β-LG encapsulated nanoparticles were fabricated through molecular interaction and self-assembly using octenyl succinic anhydride (OSA) modified potato starch-lecithin complex (OPC) with different starch molecular weight (Mw). OPC with lower starch Mw exhibited stronger interaction with β-LG and its correspondent nanoparticles showed smaller diameter and higher structural compactness. Obtained OPC based nanoparticles were spherical, of Z-average diameter from 139.9 nm to 246.8 nm, of zeta-potential from −1.94 mV to −9.42 mV and of α value from 1.41 to 2.14. Additionally, OPC based nanoparticles with lower starch Mw exhibited excellent capacity for maintaining structure integrality in simulated upper gastrointestinal tract (GIT) environment. Optimized OPC based nanoparticles with 224.4 nm of diameter, −9.00 mV of zeta-potential and 2.14 of α value had well mucus-penetrating capacity (59.25%) and colon-targeting capacity (49.18% released in simulated colonic fluid). Moreover, the OPC based nanoparticles passed through the upper GIT signally stimulated GLP-1 secretion (improved 119.23%) primarily through β-LG targeting released in colon in the prophase and short-chain fatty acids and reducing sugar produced by colonic microbial degradation of OPC in the later phase. Altogether, OPC based nanoparticles have great potential of mucus penetrating and colon-targeting delivery systems for use in stimulating GLP-1 secretion which can support applications for maintaining glycemic homeostasis.

Effects of charge distribution and degree of methylesterification of pectin emulsifier on bioaccessibility of curcumin incorporated in nanoemulsions

The objectives of this study were to elucidate the effects of degree of methyl esterification (DM) and charge distribution of pectin on the stability of emulsions and to analyze bioaccessibility of curcumin incorporated in emulsions stabilized by pectins. Three commercial pectins, CP72 (DM72), CP50 (DM50), and CP7 (DM7), were used. MP50 (DM50) with consecutive demethylesterified galacturonic acid residues was prepared from CP72 via demethylesterification to induce different charge distributions. Emulsions containing curcumin were prepared and were stored for 30 days. The CP72 and CP50 emulsions remained relatively stable for 30 days. However, MP50 and CP7 were less effective at forming stable emulsions. When the pectin emulsions passed through each phase of the simulated gastrointestinal tract (GIT), the CP72 and CP50 emulsions retained their initial droplet structures after in vitro mouth and gastric digestion, whereas the MP50 and CP7 emulsions exhibited gel-like clusters, although the gel-like formation of MP50 was distinct from that observed in CP7. MP50 emulsion showed a high degree of final lipid digestion and high bioaccessibility of curcumin while CP72 emulsion displayed a low degree of final lipid digestion. CP50 exhibited low bioaccessibility of curcumin, which might have been contributed by its fast lipid digestion profiles.

Production and simulated digestion of high-load beads containing Schizochytrium oil encapsulated utilizing prilling technique

The oil from the heterotroph Schizochytrium is a rich source of n-3 PUFA, particularly DHA, and therefore highly susceptible to oxidation. The present work reports the first application of coaxial prilling for the protection of this oil through microencapsulation. After process optimization, core-shell microparticles were produced with calcium or zinc alginate at different concentrations. Encapsulates were analyzed in their tocopherol and PUFA content. Prilling lowered the earlier but had little effect on the latter. Microcapsules coated with calcium alginate (1 % and 1.75 %) had higher oil load and encapsulation efficiency and were therefore submitted to in vitro digestion together with a simulated meal. Digesta were also analyzed with HPLC-qTOF and 1H NMR and compared to undigested encapsulates. While 1 % calcium shell granted lower oil release and protection from oxidation in the simulated gastrointestinal tract, chromatographic and spectroscopic data of digesta showed higher presence of lipid digestion products.

Different effects of vitamin supplementation on arsenic bioaccessibility in contaminated soils using multiple in vitro methods and their relevant mechanisms

Exposure to arsenic (As) induces adverse effects on human health. Vitamins B1, B6, and C, as indispensable micronutrients for humans, have been proven to influence the metabolism and toxicity of ingested As. To determine the effect of vitamins on health risks associated with soil exposure, As bioaccessibility in 14 soil samples using four in vitro methods of IVG, PBET, SBRC, and UBM was measured with the addition of vitamins B1, B6, and C. With vitamins B1 and B6 addition, the gastric As bioaccessibility in 14 soil samples was reduced by 1.14–3.52 and 1.14–5.02 fold, respectively, and instead an increase in the intestinal bioaccessibility was presented in some cases. Vitamin C supplementation yielded higher As bioaccessibility in the gastric (1.13–13.02 fold) and small intestinal (1.21–33.35 fold) phases, respectively. As evidenced by the X-ray absorption near-edge spectroscopy (XANES) and Fourier transform infrared spectroscopy (FTIR) analysis, arsenic dissolution was promoted by Fe-As and hindered by the formation of Al-As fractions. Soil As dissolution in the simulated gastrointestinal tract was strongly influenced by soil minerals and ingested vitamins, due to the chelation of arsenic with vitamins and soil minerals such as Fe (hydr)oxides, and Fe(III) reductive dissolution to enhance As release by vitamin C as an iron reducer. These findings will expand the knowledge of health risks of exposure to As-contaminated soils and nutritional interventions aiming at the mitigation of As toxicity.

Exploring the potential of red pitaya pulp (Hylocererus sp.) as a plant-based matrix for probiotic delivery and effects on betacyanin content and flavoromics

This study evaluated the potential of red pitaya pulp fermented with Lacticaseibacillus paracasei subsp. paracasei F-19 (F-19) as a base for probiotic products. Physicochemical parameters, sugar, betacyanin, and phenolic contents, and antioxidant activity were analyzed over 28 days at 4 °C and compared to a non-fermented pulp, and to a pulp fermented with Bifidobacterium animalis subsp. lactis BB-12 (BB-12). Volatile compounds were identified using HS-SPME/GC–MS. Probiotic viability during storage and survival through in vitro-simulated gastrointestinal tract (GIT) stress were assessed. Red pitaya pulp, rich in moisture (85.83 g/100 g), carbohydrates (11.65 g/100 g), and fibers (2.49 g/100 g), supported fermentation by both strains. F-19 and BB-12 lowered pH, with F-19 showing stronger acidification, and maintained high viability (8.85–8.90 log CFU/mL). Fermentation altered sugar profiles and produced unique volatile compounds, enhancing aroma and sensory attributes. F-19 generated 2-phenylethanol, a unique flavor compound, absent in BB-12. Phenolic content initially increased but antioxidant activity decreased during storage. Betacyanin remained stable for up to 14 days. Red pitaya improved F-19 viability through the simulated GIT, while BB-12 populations significantly decreased (p < 0.05). These results suggest red pitaya pulp is a promising plant-based matrix for F-19, offering protection during digestion and highlighting its potential as a functional food with enhanced bioactive compound bioavailability and sensory attributes.