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1.
Carbohydr Polym ; 337: 122188, 2024 Aug 01.
Article in English | MEDLINE | ID: mdl-38710565

ABSTRACT

Growing plants in karst areas tends to be difficult due to the easy loss of water and soil. To enhance soil agglomeration, water retention, and soil fertility, this study developed a physically and chemically crosslinked hydrogel prepared from quaternary ammonium guar gum and humic acid. The results showed that non-covalent dynamic bonds between the two components delayed humic acid release into the soil, with a release rate of only 35 % after 240 h. The presence of four hydrophilic groups (quaternary ammonium, hydroxyl, carboxyl, and carbonyl) in the hydrogel more than doubled the soil's water retention capacity. The interaction between hydrogel and soil minerals (especially carbonate and silica) promoted hydrogel-soil and soil­carbonate adhesion, and the adhesion strength between soil particles was enhanced by 650 %. Moreover, compared with direct fertilization, this degradable hydrogel not only increased the germination rate (100 %) and growth status of mung beans but also reduced the negative effects of excessive fertilization on plant roots. The study provides an eco-friendly, low-cost, and intelligent system for soil improvement in karst areas. It further proves the considerable application potential of hydrogels in agriculture.


Subject(s)
Galactans , Humic Substances , Hydrogels , Mannans , Plant Gums , Quaternary Ammonium Compounds , Soil , Plant Gums/chemistry , Galactans/chemistry , Mannans/chemistry , Hydrogels/chemistry , Soil/chemistry , Quaternary Ammonium Compounds/chemistry , Fertilizers , Delayed-Action Preparations/chemistry , Germination/drug effects , Water/chemistry
2.
Langmuir ; 40(19): 10305-10312, 2024 May 14.
Article in English | MEDLINE | ID: mdl-38696716

ABSTRACT

The limited elasticity and inadequate bonding of hydrogels made from guar gum (GG) significantly hinder their widespread implementation in personalized wearable flexible electronics. In this study, we devise GG-based self-adhesive hydrogels by creating an interpenetrating network of GG cross-linked with acrylic, 4-vinylphenylboronic acid, and Ca2+. With the leverage of the dynamic interactions (hydrogen bonds, borate ester bonds, and coordination bonds) between -OH in GG and monomers, the hydrogel exhibits a high stretchability of 700%, superior mechanical stress of 110 kPa, and robust adherence to several substrates. The adhesion strength of 54 kPa on porcine skin is obtained. Furthermore, the self-adhesive hydrogel possesses stable conductivity, an elevated gauge factor (GF), and commendable durability. It can be affixed to the human body as a strain sensor to obtain precise monitoring of human movement behavior. Our research offers possibilities for the development of GG-based hydrogels and applications in wearable electronics and medical monitoring.


Subject(s)
Electric Conductivity , Galactans , Hydrogels , Mannans , Plant Gums , Hydrogels/chemistry , Mannans/chemistry , Plant Gums/chemistry , Galactans/chemistry , Animals , Wearable Electronic Devices , Humans , Swine , Adhesives/chemistry
3.
Bioresour Technol ; 401: 130719, 2024 Jun.
Article in English | MEDLINE | ID: mdl-38642662

ABSTRACT

Currently, the production of manno-oligosaccharides (MOS) from guar gum faces challenges of low oligosaccharide enzymatic hydrolysis yield and complicated steps in separation and purification. In this work, a potential strategy to address these issues was explored. By combining citric acid pretreatment (300 mM, 130 °C, 1 h) with ß-mannanase hydrolysis, an impressive MOS yield of 61.8 % from guar gum (10 %, w/v) was achieved. The key success lay in the optimizing conditions that completely degraded other galactomannans into monosaccharides, which could be easily removable through Saccharomyces cerevisiae fermentation (without additional nutrients). Following ion exchange chromatography for desalination, and concluding with spray drying, 4.57 g of solid MOS with a purity of 90 % was obtained from 10 g of guar gum. This method offers a streamlined and effective pathway for obtaining high-yield and high-purity MOS from guar gum by combining citric acid pretreatment and enzymatic hydrolysis.


Subject(s)
Citric Acid , Galactans , Mannans , Oligosaccharides , Plant Gums , beta-Mannosidase , Mannans/chemistry , Plant Gums/chemistry , Galactans/chemistry , Hydrolysis , Citric Acid/chemistry , Oligosaccharides/chemistry , beta-Mannosidase/metabolism , Saccharomyces cerevisiae/metabolism , Fermentation
4.
Int J Biol Macromol ; 267(Pt 1): 131431, 2024 May.
Article in English | MEDLINE | ID: mdl-38593896

ABSTRACT

In recent years, there increment demand for healthier food options that can replace high-fat ingredients in bakery products without compromising their taste and texture. This research was focused on a formulation study of the blend of nano polysaccharides derived from aloe vera and guar gum at various concentrations. This study selected the blend concentration of 1 % aloe vera mucilage (AM) and 1 % guar gum (GG) due to its optimal gelling properties. Different magnetic stirring time durations were employed to formulate AGB (aloe vera guar gum blend). The particle size of AGB revealed the lowest nanoparticle size (761.03 ± 62 nm) with a stirring time of 4 h. The FTIR analysis found the presence of monomer sugars in AGB nano polysaccharide powder such as mannose, arabinose, and glucose. The thermogram results displayed an endothermic peak for all samples with a glass transition temperature (Tg) between 16 and 50 °C. The SEM image of the AGB indicated uniform spherical particles. The AGB powder exhibited good functional properties. The antimicrobial activity of AGB powder against Staphylococcus aureus, Escherichia coli, and Candida albicans was 22.32 ± 0.02, 21.56 ± 0.02, and 19.33 ± 0.33 mm, respectively. Furthermore, the effects of different levels of vegetable fat replacement with AGB powder on cake sensory properties, thermal stability, and texture characteristics were also examined. Notably, the cake containing a 50 % substitution of vegetable fat with AGB (C50) supplied desirable physicochemical, textural, and sensory properties. These results can provide advantages for the development of fat replacers in bakery products.


Subject(s)
Aloe , Galactans , Mannans , Plant Gums , Polysaccharides , Galactans/chemistry , Mannans/chemistry , Mannans/pharmacology , Plant Gums/chemistry , Aloe/chemistry , Polysaccharides/chemistry , Polysaccharides/pharmacology , Fat Substitutes/chemistry , Candida albicans/drug effects , Particle Size , Anti-Infective Agents/pharmacology , Anti-Infective Agents/chemistry , Staphylococcus aureus/drug effects , Nanoparticles/chemistry
5.
Chem Pharm Bull (Tokyo) ; 72(5): 454-470, 2024 May 09.
Article in English | MEDLINE | ID: mdl-38644216

ABSTRACT

This study investigates the efficacy of modified Albizia procera gum as a release-retardant polymer in Diltiazem hydrochloride (DIL) matrix tablets. Carboxymethylated Albizia procera gum (CAP) and ionically crosslinked carboxymethylated Albizia procera gum (Ca-CAP) were utilized, with Ca-CAP synthesized via crosslinking CAP with calcium ions (Ca2+) using calcium chloride (CaCl2). Fourier Transform (FT) IR analysis affirmed polymer compatibility, while differential scanning calorimetry (DSC) and X-ray diffraction (XRD) assessed thermal behavior and crystallinity, respectively. Zeta potential analysis explored surface charge and electrostatic interactions, while rheology examined flow and viscoelastic properties. Swelling and erosion kinetics provided insights into water penetration and stability. CAP's carboxymethyl groups (-CH2-COO-) heightened divalent cation reactivity, and crosslinking with CaCl2 produced Ca-CAP through -CH2-COO- and Ca2+ interactions. Structural similarities between the polymers were revealed by FTIR, with slight differences. DSC indicated modified thermal behavior in Ca-CAP, while Zeta potential analysis showcased negative charges, with Ca-CAP exhibiting lower negativity. XRD highlighted increased crystallinity in Ca-CAP due to calcium crosslinking. Minimal impact on RBC properties was observed with both polymers compared to the positive control as water for injection (WFI). Ca-CAP exhibited improved viscosity, strength, controlled swelling, and erosion, allowing prolonged drug release compared to CAP. Stability studies confirmed consistent six-month drug release, emphasizing Ca-CAP's potential as a stable, sustained drug delivery system over CAP. Robustness and accelerated stability tests supported these findings, underscoring the promise of Ca-CAP in controlled drug release applications.


Subject(s)
Diltiazem , Plant Gums , Tablets , Diltiazem/chemistry , Plant Gums/chemistry , Tablets/chemistry , Albizzia/chemistry , Drug Liberation , Cross-Linking Reagents/chemistry , Cross-Linking Reagents/chemical synthesis
6.
Int J Biol Macromol ; 267(Pt 2): 131521, 2024 May.
Article in English | MEDLINE | ID: mdl-38608976

ABSTRACT

Herein, the effects of anionic xanthan gum (XG), neutral guar gum (GG), and neutral konjac glucomannan (KGM) on the dissolution, physicochemical properties, and emulsion stabilization ability of soy protein isolate (SPI)-polysaccharide conjugates were studied. The SPI-polysaccharide conjugates had better water dissolution than the insoluble SPI. Compared with SPI, SPI-polysaccharide conjugates had lower ß-sheet (39.6 %-56.4 % vs. 47.3 %) and α-helix (13.0 %-13.2 % vs. 22.6 %) percentages, and higher ß-turn (23.8 %-26.5 % vs. 11.0 %) percentages. The creaming stability of SPI-polysaccharide conjugate-stabilized fish oil-loaded emulsions mainly depended on polysaccharide type: SPI-XG (Creaming index: 0) > SPI-GG (Creaming index: 8.1 %-21.2 %) > SPI-KGM (18.1 %-40.4 %). In addition, it also depended on the SPI preparation concentrations, glycation times, and glycation pH. The modification by anionic XG induced no obvious emulsion creaming even after 14-day storage, which suggested that anionic polysaccharide might be the best polysaccharide to modify SPI for emulsion stabilization. This work provided useful information to modify insoluble proteins by polysaccharides for potential application.


Subject(s)
Emulsions , Fish Oils , Galactans , Mannans , Plant Gums , Polysaccharides, Bacterial , Solubility , Soybean Proteins , Mannans/chemistry , Polysaccharides, Bacterial/chemistry , Plant Gums/chemistry , Emulsions/chemistry , Soybean Proteins/chemistry , Galactans/chemistry , Fish Oils/chemistry , Anions/chemistry
7.
Int J Biol Macromol ; 267(Pt 2): 131545, 2024 May.
Article in English | MEDLINE | ID: mdl-38614168

ABSTRACT

Corn starch (CS) is a good alternative to synthetic polymers due to its sustainability; nevertheless, because of its weak tensile strength, the matrix requires another polymer. Therefore, 0.5 % (w/v) moringa gum (MG) was added. The purpose of this study was to assess how pine cone extract (PCE) affected the physiochemical and mechanical properties of corn starch and moringa gum (CS/MG) films and their use as UV-blocking composites. The findings suggest that the PCE improved the elongation at break from 3.27 % to 35.2 % while greatly reducing the tensile strength. The hydrogen bonding between CS/MG and PCE was visible in the FTIR spectra. The XRD graph indicated that the films were amorphous. In comparison to CS/MG films, PCE-incorporated edible films demonstrated significant UV-blocking ability indicating their potential as sustainable packaging material for light-sensitive food products.


Subject(s)
Edible Films , Food Packaging , Pinus , Plant Extracts , Starch , Ultraviolet Rays , Food Packaging/methods , Starch/chemistry , Plant Extracts/chemistry , Pinus/chemistry , Moringa/chemistry , Tensile Strength , Zea mays/chemistry , Plant Gums/chemistry
8.
Int J Biol Macromol ; 267(Pt 2): 131363, 2024 May.
Article in English | MEDLINE | ID: mdl-38583847

ABSTRACT

Recently, various innovative advancements have been made in carbohydrate research to design versatile materials for biomedical applications. The current research focuses on the development of copolymeric hydrogel wound dressings (HWD) using a combination of aloe vera (AV) - sterculia gum (SG) - poly (vinylsulfonic acid) (VSA)-based with the aim to enhancing their efficacy in drug delivery (DD) applications. These hydrogel dressings were encapsulated with levofloxacin and lidocaine to address both microbial infection and pain. Copolymers were characterized by FESEM, SEM, EDS, AFM, 13C NMR, FTIR, XRD, and TGA-DTG analysis. Hydrogel exhibited a fluid absorption capacity of 4.52 ± 0.12 g per gram of polymeric dressing in simulated wound conditions. The hydrogels displayed a sustained release of drugs, demonstrating a non-Fickian diffusion mechanism. Polymer dressings revealed antibacterial, mucoadhesive, antioxidant, biocompatible and non-cytotoxic properties. Additionally, HWD displayed permeability to O2 and water vapour, yet was impermeable to microbial penetration. Overall, the findings of physiological, biochemical and drug delivery properties demonstrated the suitability of materials for wound dressing applications.


Subject(s)
Aloe , Anti-Bacterial Agents , Bandages , Hydrogels , Plant Gums , Sterculia , Wound Healing , Aloe/chemistry , Wound Healing/drug effects , Anti-Bacterial Agents/pharmacology , Anti-Bacterial Agents/chemistry , Sterculia/chemistry , Hydrogels/chemistry , Hydrogels/pharmacology , Plant Gums/chemistry , Antioxidants/pharmacology , Antioxidants/chemistry , Humans , Animals , Polymers/chemistry , Biocompatible Materials/chemistry , Biocompatible Materials/pharmacology , Drug Liberation
9.
Int J Biol Macromol ; 267(Pt 2): 131591, 2024 May.
Article in English | MEDLINE | ID: mdl-38621574

ABSTRACT

In the present study, a novel environment friendly dry method for preparation of guar gum maleate (GGM) with varying degrees of substitution (DS; 0.02-1.04) was optimized. GGM with a maximum DS of 1.04 was successfully synthesized using guar gum (GG) and maleic anhydride (MA) in proportion of 1: 1 at 80 °C with 4 h of reaction time. The activation energy for the reaction was determined to be 36.91 ± 3.61 kJ mol-1 with pre-exponential factor of 1392 min-1. Esterification of GG was confirmed by FT-IR and 13C NMR. Analysis using size exclusion chromatography (SEC) indicated a decrease in weight average molecular weight (Mw) of the polymer with an increase in polydispersity index (PDI) due to esterification. In comparison with GG, GGM displayed increased hydrophobicity and reduced thermal stability, as analysed by differential scanning calorimetry (DSC). Rheological studies of GGM revealed that initial apparent viscosity decreased with increasing DS. For the first time, the study offered valuable insights on GGM synthesis under dry solvent-less reaction conditions enabling simpler and scalable synthesis process.


Subject(s)
Galactans , Maleates , Mannans , Plant Gums , Plant Gums/chemistry , Galactans/chemistry , Mannans/chemistry , Kinetics , Maleates/chemistry , Molecular Weight , Viscosity , Esterification , Rheology , Temperature , Chemistry Techniques, Synthetic , Hydrophobic and Hydrophilic Interactions
10.
Food Chem ; 449: 139244, 2024 Aug 15.
Article in English | MEDLINE | ID: mdl-38583397

ABSTRACT

This study aimed to investigate the effects of edible gum addition on moisture changes in freeze-dried restructured strawberry blocks (FRSB), which involved five groups: the control, 1.2% guar gum, 1.2% gelatin, 1.2% pectin, and the composite group with 0.5% guar gum, 0.5% gelatin, and 0.45% pectin. The results indicated that the drying rates of the five groups of FRSB presented similar early acceleration and later deceleration trends. Moisture content in FRSB was linearly predicted by peak area of low field nuclear magnetic resonance with R2 higher than 0.90 for all the five groups. The FRSB samples in the gelatin and composition groups formed a denser porous structure and had a lower hygroscopicity after four days of storage. This study provides a theoretical basis for controlling the processing of FRSB.


Subject(s)
Fragaria , Freeze Drying , Galactans , Gelatin , Mannans , Pectins , Plant Gums , Water , Galactans/chemistry , Plant Gums/chemistry , Mannans/chemistry , Gelatin/chemistry , Pectins/chemistry , Fragaria/chemistry , Water/chemistry , Fruit/chemistry
11.
Int J Biol Macromol ; 266(Pt 1): 130932, 2024 May.
Article in English | MEDLINE | ID: mdl-38527683

ABSTRACT

The fabrication possibility of nanocomposite film from sweet cherry tree exudate gum (SCG) was studied. To improve SCG film properties, oxidation with hydrogen peroxide, ultraviolet irradiation (UV-A and UV-C), and TiO2 nanoparticles (T-NPs) were used. Hydrogen peroxide oxidation at higher amounts decreased the water vapor permeability (WVP) and thickness and increased the mechanical properties and transparency. In comparison with the UV-A, UV irradiation of the C-type increased permeability, and elongation at break (EAB) and thickness, but reduced the tensile strength (TS), solubility, and transparency. The permeability and tensile strength were increased and elongation at break was decreased at a longer time of irradiation. The transparency values of fabricated films ranged from 65.3 to 79.5 % and WVP were in the range of 2.32-4.72 (×10-10 g/m.s.Pa). The measured TS of the SCG films were between 2.2 and 5 MPa and the EAB of the SCG films was between 35 and 68.7 %. The FTIR spectrum and SEM images revealed that the treatments could affect the bonds and the smoothness of the film surface, respectively. Images provided by AFM showed that the roughness of the films was increased by the addition of T-NPs. The incorporation of T-NPs increased the TS and decreased EAB and WVP. These results indicated that oxidation, UV irradiation and nanomaterials incorporation could be used to improve SCG film properties that are related to food packaging material.


Subject(s)
Hydrogen Peroxide , Nanoparticles , Oxidation-Reduction , Permeability , Plant Gums , Prunus avium , Titanium , Ultraviolet Rays , Titanium/chemistry , Hydrogen Peroxide/chemistry , Nanoparticles/chemistry , Plant Gums/chemistry , Prunus avium/chemistry , Steam , Nanocomposites/chemistry , Tensile Strength , Solubility
12.
Carbohydr Polym ; 334: 122009, 2024 Jun 15.
Article in English | MEDLINE | ID: mdl-38553200

ABSTRACT

Colon specific delivery of therapeutics have gained much attention of pharmaceutical researchers in the recent past. Colonic specific targeting of drugs is used not only for facilitating absorption of protein or peptide drugs, but also localization of therapeutic agents in colon to treat several colonic disorders. Among various biopolymers, guar gum (GG) exhibits pH dependent swelling, which allows colon specific release of drug. GG also shows microbial degradation in the colonic environment which makes it a suitable excipient for developing colon specific drug delivery systems. The uncontrolled swelling and hydration of GG can be controlled by structural modification or by grafting with another polymeric moiety. Several graft copolymerized guar gum derivatives are investigated for colon targeting of drugs. The efficacy of various guar gum derivatives are evaluated for colon specific delivery of drugs. The reviewed literature evidenced the potentiality of guar gum in localizing drugs in the colonic environment. This review focuses on the synthesis of several guar gum derivatives and their application in developing various colon specific drug delivery systems including matrix tablets, coated formulations, nano or microparticulate delivery systems and hydrogels.


Subject(s)
Colon , Drug Delivery Systems , Colon/metabolism , Plant Gums/chemistry , Galactans/chemistry , Mannans/chemistry , Drug Carriers/metabolism
13.
Food Funct ; 15(8): 4051-4064, 2024 Apr 22.
Article in English | MEDLINE | ID: mdl-38535983

ABSTRACT

This study evaluated the nutritional profile and fiber content of innovative formulations of wheat-based biscuits enriched with chia seeds, carob flour and coconut sugar. The in vitro antioxidant, cytotoxic, anti-inflammatory and antimicrobial activities were also investigated to understand the potential health advantages of the incorporation of these new ingredients. The novel biscuits demonstrated significant improvements in protein and mineral content, with increases of 50% and 100% in chia biscuits, and up to 20% and 40% in carob biscuits, respectively. Fiber also notably increased, particularly in samples containing 10% carob flour, which increased four times as compared to wheat-based samples. The new ingredients exhibited antibacterial and antifungal activity, particularly against Yersinia enterocolitica (minimum inhibitory concentration 1.25 mg mL-1 in coconut sugar) and Aspergillus fumigatus (minimum inhibitory concentration/minimum fungicidal concentrations 2.5/5 mg mL-1 in chia seeds). However, the final biscuits only displayed antifungal properties. Carob flour and chia seeds had a remarkably high capacity to inhibit the formation of TBARS and promoted greater antioxidant activity in biscuit formulations, with EC50 values decreasing from 23.25 mg mL-1 (control) to 4.54 mg mL-1 (15% defatted ground chia seeds) and 1.19 mg mL-1 (10% carob flour). Only chia seeds exhibited cellular antioxidant, anti-inflammatory and cytotoxic activity, attributes that were lost when seeds were added into the biscuits. These findings highlight the potential health benefits of these ingredients, particularly when incorporated in new wheat-based formulations.


Subject(s)
Antioxidants , Dietary Fiber , Flour , Galactans , Mannans , Nutritive Value , Triticum , Triticum/chemistry , Dietary Fiber/analysis , Dietary Fiber/pharmacology , Antioxidants/pharmacology , Antioxidants/chemistry , Flour/analysis , Seeds/chemistry , Plant Gums/chemistry , Plant Gums/pharmacology , Anti-Infective Agents/pharmacology , Salvia/chemistry , beta-Glucans/pharmacology , beta-Glucans/chemistry , Anti-Inflammatory Agents/pharmacology , Anti-Inflammatory Agents/chemistry , Bread/analysis , Anti-Bacterial Agents/pharmacology , Anti-Bacterial Agents/chemistry , Gum Arabic/chemistry , Gum Arabic/pharmacology , Animals , Microbial Sensitivity Tests , Humans
14.
Int J Biol Macromol ; 266(Pt 1): 130963, 2024 May.
Article in English | MEDLINE | ID: mdl-38508561

ABSTRACT

The effects of various hydrocolloids (guar gum, xanthan gum, and carboxymethyl cellulose) on the texture, rheology, and microstructural properties of modeling clay prepared with cassava starch were investigated. Notably, incorporation of 3 % guar gum and 4 % xanthan gum into starch-based modeling clay resulted in enhancements of 94.12 % and 77.47 % in cohesiveness, and 64.70 % and 66.20 % in extensibility, respectively. For starch-based modeling clay with added guar gum and xanthan gum, compared to formulations without hydrocolloids, the linear viscoelastic range exceeded 0.04 %, and the frequency dependence of both maximum creep compliance (Jmax) and storage modulus (G') was significantly reduced. This indicates a more stable network structure and enhanced resistance to deformation. Results from Fourier Transform Infrared (FTIR) spectroscopy and X-ray diffraction (XRD) confirmed that the physical interactions between starch and various hydrocolloids, along with the addition of these hydrocolloids, inhibited the degradation effect of thermomechanical processing on the crystalline structure of starch. With the addition of guar gum, it is observed that a continuous and dense network structure forms within the starch-based modeling clay, and starch particles are distributed uniformly. In conclusion, hydrocolloids enhances the properties of starch-based modeling clay, introducing an innovative solution to the modeling clay sector.


Subject(s)
Clay , Colloids , Elasticity , Galactans , Mannans , Plant Gums , Polysaccharides, Bacterial , Starch , Starch/chemistry , Colloids/chemistry , Clay/chemistry , Plant Gums/chemistry , Viscosity , Galactans/chemistry , Mannans/chemistry , Polysaccharides, Bacterial/chemistry , Rheology , Spectroscopy, Fourier Transform Infrared , X-Ray Diffraction , Aluminum Silicates/chemistry
15.
Int J Biol Macromol ; 267(Pt 1): 131201, 2024 May.
Article in English | MEDLINE | ID: mdl-38554921

ABSTRACT

As a promising green and sustainable coating material, gum was extracted from durian seed to produce eutectogel, which the properties were tunable using natural deep eutectic solvent (NADES). Ten different eutectogels were successfully synthesized using durian seed gum (DSG) and xanthan gum (XG) gelators at different composition (5, 10, 15 %) to gel choline chloride-glucose (1:1), choline chloride-fructose (1:2) and betaine-glucose-water (1:1:1) NADESs. Results revealed that eutectogel was non-Newtonian and weak gel material with excellent thermostability up to 200 °C. When the gum content increased, the resulted eutectogel showed higher viscosity, yield stress, hardness, gumminess, adhesiveness, and weight holding capacity. In overall, choline chloride-fructose (1:2) NADES and 10 % of DSG formed an excellent eutectogel which remained stable and compatible upon 12 weeks of storage. It displayed superior viscoelastic, texture, gases and moisture barrier properties which were beneficial for food coating application. This eutectogel was able to extend the shelf life of fresh-cut apples during storage with lower weight loss and higher total phenolic content (TPC). The potential future of this well-characterized tunable DSG-derived eutectogel includes, but not limited to, food and pharmaceutical industries, smart sensing, flexible wearable electronics, water purification, supercapacitors and batteries.


Subject(s)
Bombacaceae , Food Preservation , Gels , Plant Gums , Rheology , Seeds , Plant Gums/chemistry , Seeds/chemistry , Gels/chemistry , Bombacaceae/chemistry , Food Preservation/methods , Viscosity , Polysaccharides, Bacterial/chemistry , Temperature
16.
Int J Biol Macromol ; 266(Pt 1): 131213, 2024 May.
Article in English | MEDLINE | ID: mdl-38552690

ABSTRACT

To avoid the weakness (lower adsorption rate and selectivity) of peach gum polysaccharide (PGP) and improve the adsorption performance of polyacrylamide (PAAm) hydrogel (lower adsorption capacity), in the present work, the PGP was chemically tailored to afford ammoniated PGP (APGP) and quaternized PGP (QPGP), and attapulgite (ATP) was bi-functionalized with cation groups and carbon­carbon double bond. Then, PAAm/APGP and PAAm/QPGP/ATP hydrogels were synthesized via redox polymerization. The synthesis procedure and properties of hydrogels were traced by FTIR, SEM, XPS, TGA, TEM, and BET methods, and the dye adsorption performance of the hydrogels was evaluated using the new coccine (NC) and tartrazine (TTZ) aqueous solutions as the model anionic dyes. Effects of initial dye concentration, pH, and ionic strength on the adsorption were investigated. Compared with PAAm/APGP hydrogel, PAAm/APGP/ATP hydrogel exhibits higher adsorption rate, superior adsorption capacity, stability, and selectivity towards anionic dye. The adsorption process of PAAm/QPGP/ATP hydrogel reached equilibrium in about 20 min and followed the pseudo-second-order kinetic model and Langmuir isotherm. The adsorption capacities towards NC and TTZ of PAAm/QPGP/ATP hydrogel were calculated as 873.235 and 731.432 mg/g. This hydrogel adsorbent originating from PAAm, PGP, and ATP shows great promise for application in practical water treatment.


Subject(s)
Acrylic Resins , Coloring Agents , Hydrogels , Magnesium Compounds , Plant Gums , Silicon Compounds , Water Pollutants, Chemical , Hydrogels/chemistry , Acrylic Resins/chemistry , Coloring Agents/chemistry , Coloring Agents/isolation & purification , Adsorption , Plant Gums/chemistry , Water Pollutants, Chemical/chemistry , Water Pollutants, Chemical/isolation & purification , Silicon Compounds/chemistry , Magnesium Compounds/chemistry , Hydrogen-Ion Concentration , Kinetics , Polysaccharides/chemistry , Water Purification/methods , Anions/chemistry , Solutions , Water/chemistry
17.
Int J Biol Macromol ; 263(Pt 1): 130339, 2024 Apr.
Article in English | MEDLINE | ID: mdl-38387640

ABSTRACT

Globally, water scarcity in arid and semiarid regions has become one of the critical issues that hinder sustainable agriculture. Agriculture, being a major water consumer, presents several challenges that affect water availability. Hydrogels derived from polysaccharides seed gums are hydrophilic polymers capable of retaining substantial moisture in their three-dimensional network and releasing it back into the soil during drought conditions. Implementation of hydrogels in the agricultural sectors enhances soil health, plant growth, and crop yield. Furthermore, the soil permeability, density, structure, texture, and rate of evaporation and percolation of water are modified by hydrogel. In this review, hydrogels based on natural plant seed gum like guar, fenugreek, Tara and locust beans have been discussed in terms of their occurrence, properties, chemical structure, method of synthesis, and swelling behavior. The focus extends to recent applications of modified seed gum-based natural hydrogels in agriculture, serving as soil conditioners and facilitating nutrient delivery to growing plants. The swelling behavior and inherent structure of these hydrogels can help researchers unravel their maximum possibilities to promote sustainable agriculture and attenuate the obstacles propounded by our dynamic nature. The current review also examines market growth, prospects, and challenges of eco-friendly hydrogels in recent times.


Subject(s)
Hydrogels , Polysaccharides , Hydrogels/chemistry , Polysaccharides/chemistry , Agriculture , Soil/chemistry , Seeds , Water/chemistry , Plant Gums/chemistry
18.
Int J Biol Macromol ; 262(Pt 1): 129775, 2024 Mar.
Article in English | MEDLINE | ID: mdl-38423913

ABSTRACT

We investigate carboxymethyl hydroxypropyl guar gum (CMHPG) solution properties in water and NaCl, KCl, and CaCl2 aqueous solutions. The Huggins, Kraemer, and Rao models were applied by fitting specific and relative viscosity of CMHPG/water and CMHPG/salt/water to determine the intrinsic viscosity [η]. The Rao models yielded better results (R2 = 0.779-0.999) than Huggins and Kraemer equations. [η] decreased up to 84% in salt solution over the range 0.9-100 mM compared to water. Salt effects screened the CMHPG charged side groups chains leading to a compacted structure. In 0.9 mM NaCl(aq), the hydrodynamic coil radius (Rcoil) was 28% smaller and 45% smaller in 100 mM NaCl solution relative to water. Similar decreases were seen in KCl and CaCl2 solutions. KCl and CaCl2 were more effective than NaCl. CMHPG is salt-tolerant and shows comparatively less viscosity change than native guar gum, with modest reduced viscosity increases with CMHPG dilution at all salt concentrations. The electrostatic interactions were effective up to 100 mM salt. The activation energy of viscous flow for CMHPG solutions was computed and compared to measured xanthan gum and several literature values. These data show that the barrier to CMHPG flow is higher than for xanthan gum.


Subject(s)
Plant Gums , Polysaccharides , Sodium Chloride , Calcium Chloride , Plant Gums/chemistry , Galactans/chemistry , Mannans/chemistry , Water/chemistry , Viscosity
19.
Int J Biol Macromol ; 261(Pt 1): 129578, 2024 Mar.
Article in English | MEDLINE | ID: mdl-38246454

ABSTRACT

Guar gum (GG) composite films, incorporating the ethanolic extract of propolis (EEP), were prepared and subjected to a comprehensive investigation of their functional characteristics. The addition of EEP resulted in a discernible enhancement in the opacity, moisture barrier capacity, and elongation at break. Incorporating EEP led to a noteworthy increase in the total phenolic and total flavonoid content of the films, resulting in superior antioxidant capacity upon GG-EEP films. Remarkably, the addition of 5 % EEP yielded noteworthy outcomes, manifesting in a DPPH radical scavenging rate of 47.60 % and the ABTS radical scavenging rate of 94.87 %, as well as FRAP and cupric reducing power of 331.98 mmol FeSO4-7H2O kg-1 and 56.95 µg TE mg-1, respectively. In addition, GG-EEP films demonstrated antifungal effect against Penicillium expansum and Aspergillus niger, along with a sustained antibacterial effect against Escherichia coli and Staphylococcus aureus. GG-EEP films had superior inhibitory ability against Gram-positive bacteria than Gram-negative bacteria. Crucially, GG-EEP composite films played a pivotal role in reducing both lesion diameter and depth, concurrently mitigating weight loss and firmness decline during the storage period of "Nanguo" pears. Therefore, GG-EEP composite films have the considerable potential to serve as advanced and effective active packaging materials for food preservation.


Subject(s)
Galactans , Mannans , Propolis , Pyrus , Propolis/pharmacology , Propolis/chemistry , Plant Gums/chemistry , Anti-Bacterial Agents/pharmacology , Anti-Bacterial Agents/chemistry , Ethanol
20.
Int J Biol Macromol ; 260(Pt 1): 129474, 2024 Mar.
Article in English | MEDLINE | ID: mdl-38262832

ABSTRACT

To study the gel-forming properties of polysaccharide from the fruiting body of Clitocybe squamulosa (CSFP) and its degradation product (UH-CSFP), the changes in steady-state and dynamic rheological properties of CSFP and UH-CSFP under different conditions (polysaccharide mass fraction, temperature, pH, and salt ion concentration) were studied. Polysaccharides with good gel-forming properties were selected and mixed with common edible thickeners (gelatin, guar gum, and locust bean gum), after which the properties of the composite gel were assessed. The steady-state rheological results showed that CSFP and UH-CSFP were pseudoplastic fluids, their apparent viscosity decreased with increasing temperature, the viscosity was greatest when the pH was 7. The addition of Na+ and Ca2+ could increase the viscosity, and the viscosity of UH-CSFP was lower than that of CSFP at the same mass fraction. The results of dynamic rheology indicated that G´ and G´´ of CSFP and UH-CSFP increased with increasing mass fraction, pH, and ion concentration (0.01 M to 1 M), and G´´ was always smaller than G´ indicating weak gel behavior. The thixotropy-related experimental results showed that the thixotropy ring area of CSFP and UH-CSFP increased with increasing mass fraction, the ring area of CSFP was larger than that of UH-CSFP, and the gel strength of CSFP was greater than that of UH-CSFP. The results of CSFP and three types of edible gels showed that the composite gels were pseudoplastic fluids, and their apparent viscosity was ranked (in descending order) as follows: guar bean gum, locust bean gum, and gelatin. The addition of CSFP improved the gel-forming properties of guar gum but did not significantly improve the gel properties of locust bean gum and gelatin. This study provides a theoretical basis for the selection of processing methods and the application of polysaccharides.


Subject(s)
Agaricales , Gelatin , Polysaccharides/chemistry , Mannans/chemistry , Plant Gums/chemistry , Gels , Rheology , Viscosity
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