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Zheng Y, Liu Q, Luo H, Zheng J, Li W. Effect of pretreatment with electron beam irradiation on the deacetylation efficiency of konjac glucomannan and its structural, physicochemical and gel properties. Int J Biol Macromol 2024; 276:133887. [PMID: 39019354 DOI: 10.1016/j.ijbiomac.2024.133887] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2024] [Revised: 05/17/2024] [Accepted: 07/13/2024] [Indexed: 07/19/2024]
Abstract
Due to its emulsifying and thickening properties, konjac glucomannan (KGM) is widely used in the food, medicine, and materials industries. Nevertheless, its high viscosity and significant water absorption limit its application range. Therefore, electron beam (e-beam) irradiation pretreatment was carried out to improve the deacetylation efficiency of KGM, and the physicochemical and gel properties of KGM were investigated. The results show that e-beam irradiation and deacetylation decrease the water absorption, solubility, transparency, molecular weight, and viscosity of KGM. Conversely, the moisture content, thermal stability, and water-binding capacity increase. FTIR and X-ray diffraction analysis revealed no significant changes in the chemical and crystalline structure of KGM before and after modification. However, modification weakens the intermolecular interaction of KGM hydrosols, which affects their rheology. Furthermore, deacetylation improves the mechanical properties and water retention capacity of KGM gels. Overall, the e-beam irradiation pretreatment provides a method to increase the efficiency of KGM deacetylation and improve the physical and chemical properties of KGM, thus expanding its potential applications in the food and chemical industries, among others.
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Affiliation(s)
- Yue Zheng
- College of Food Science and Engineering, Northwest A&F University, Yangling 712100, Shaanxi, China
| | - Qing Liu
- College of Food Science and Engineering, Northwest A&F University, Yangling 712100, Shaanxi, China
| | - Haiyu Luo
- College of Food Science and Engineering, Northwest A&F University, Yangling 712100, Shaanxi, China
| | - Jiayu Zheng
- College of Food Science and Engineering, Northwest A&F University, Yangling 712100, Shaanxi, China
| | - Wenhao Li
- College of Food Science and Engineering, Northwest A&F University, Yangling 712100, Shaanxi, China.
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Lin ZM, Wen JX, Lin DQ, Liu K, Chen YL, Miao S, Cao MJ, Sun LC. Physicochemical and Rheological Properties of Degraded Konjac Gum by Abalone ( Haliotis discus hannai) Viscera Enzyme. Foods 2024; 13:2158. [PMID: 38998663 PMCID: PMC11241667 DOI: 10.3390/foods13132158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2024] [Revised: 06/02/2024] [Accepted: 07/02/2024] [Indexed: 07/14/2024] Open
Abstract
In the present study, a new degraded konjac glucomannan (DKGM) was prepared using a crude enzyme from abalone (Haliotis discus hannai) viscera, and its physicochemical properties were investigated. After enzymatic hydrolysis, the viscosity of KGM obviously decreased from 15,500 mPa·s to 398 mPa·s. The rheological properties analysis of KGM and DKGMs revealed that they were pseudoplastic fluids, and pseudoplasticity, viscoelasticity, melting temperature, and gelling temperature significantly decreased after enzymatic hydrolysis, especially for KGM-180 and KGM-240. In addition, the molecular weight of KGM decreased from 1.80 × 106 Da, to 0.45 × 106 Da and the polydispersity index increased from 1.17 to 1.83 after 240 min of degradation time. Compared with natural KGM, the smaller particle size distribution of DKGM further suggests enzyme hydrolysis reduces the aggregation of molecular chains with low molecular weight. FT-IR and FESEM analyses showed that the fragmented KMG chain did not affect the structural characteristics of molecular monomers; however, the dense three-dimensional network microstructure formed by intermolecular interaction changed to fragment microstructure after enzyme hydrolysis. These results revealed that the viscosity and rheological properties of KGM could be controlled and effectively changed using crude enzymes from abalone viscera. This work provides theoretical guidance for the promising application of DKGM in the food industry.
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Affiliation(s)
- Zhao-Ming Lin
- College of Ocean Food and Biological Engineering, Jimei University, Xiamen 361021, China; (Z.-M.L.); (J.-X.W.); (D.-Q.L.); (K.L.); (Y.-L.C.); (M.-J.C.)
- National & Local Joint Engineering Research Center of Deep Processing Technology for Aquatic Products, Jimei University, Xiamen 361021, China
| | - Jia-Xin Wen
- College of Ocean Food and Biological Engineering, Jimei University, Xiamen 361021, China; (Z.-M.L.); (J.-X.W.); (D.-Q.L.); (K.L.); (Y.-L.C.); (M.-J.C.)
- National & Local Joint Engineering Research Center of Deep Processing Technology for Aquatic Products, Jimei University, Xiamen 361021, China
| | - Duan-Quan Lin
- College of Ocean Food and Biological Engineering, Jimei University, Xiamen 361021, China; (Z.-M.L.); (J.-X.W.); (D.-Q.L.); (K.L.); (Y.-L.C.); (M.-J.C.)
- National & Local Joint Engineering Research Center of Deep Processing Technology for Aquatic Products, Jimei University, Xiamen 361021, China
- Collaborative Innovation Center of Seafood Deep Processing, Dalian 116034, China
| | - Kang Liu
- College of Ocean Food and Biological Engineering, Jimei University, Xiamen 361021, China; (Z.-M.L.); (J.-X.W.); (D.-Q.L.); (K.L.); (Y.-L.C.); (M.-J.C.)
- National & Local Joint Engineering Research Center of Deep Processing Technology for Aquatic Products, Jimei University, Xiamen 361021, China
- Collaborative Innovation Center of Seafood Deep Processing, Dalian 116034, China
| | - Yu-Lei Chen
- College of Ocean Food and Biological Engineering, Jimei University, Xiamen 361021, China; (Z.-M.L.); (J.-X.W.); (D.-Q.L.); (K.L.); (Y.-L.C.); (M.-J.C.)
- National & Local Joint Engineering Research Center of Deep Processing Technology for Aquatic Products, Jimei University, Xiamen 361021, China
- Collaborative Innovation Center of Seafood Deep Processing, Dalian 116034, China
| | - Song Miao
- Teagasc Food Research Centre, Moorepark, Fermoy, P61 C996 Cork, Ireland;
| | - Min-Jie Cao
- College of Ocean Food and Biological Engineering, Jimei University, Xiamen 361021, China; (Z.-M.L.); (J.-X.W.); (D.-Q.L.); (K.L.); (Y.-L.C.); (M.-J.C.)
- National & Local Joint Engineering Research Center of Deep Processing Technology for Aquatic Products, Jimei University, Xiamen 361021, China
- Collaborative Innovation Center of Seafood Deep Processing, Dalian 116034, China
| | - Le-Chang Sun
- College of Ocean Food and Biological Engineering, Jimei University, Xiamen 361021, China; (Z.-M.L.); (J.-X.W.); (D.-Q.L.); (K.L.); (Y.-L.C.); (M.-J.C.)
- National & Local Joint Engineering Research Center of Deep Processing Technology for Aquatic Products, Jimei University, Xiamen 361021, China
- Collaborative Innovation Center of Seafood Deep Processing, Dalian 116034, China
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Thirunavookarasu N, Kumar S, Shetty P, Shanmugam A, Rawson A. Impact of ultrasound treatment on the structural modifications and functionality of carbohydrates - A review. Carbohydr Res 2024; 535:109017. [PMID: 38163393 DOI: 10.1016/j.carres.2023.109017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2023] [Revised: 12/18/2023] [Accepted: 12/18/2023] [Indexed: 01/03/2024]
Abstract
Carbohydrates are crucial in food as essential biomolecules, serving as natural components, ingredients, or additives. Carbohydrates have numerous applications in the food industry as stabilizers, thickeners, sweeteners, and humectants. The properties and functionality of the carbohydrates undergo alterations when exposed to various thermal or non-thermal treatments. Ultrasonication is a non-thermal method that modifies the structural arrangement of carbohydrate molecules. These structural changes lead to enhanced gelling and viscous nature of the carbohydrates, thus enhancing their scope of application. Ultrasound may improve carbohydrate functionality in an environmentally sustainable way, leaving no chemical residues. The high-energy ultrasound treatments significantly reduce the molecular size of complex carbohydrates. Sonication parameters like treatment intensity, duration of treatment, and energy applied significantly affect the molecular size, depolymerization, viscosity, structural modifications, and functionality of carbohydrate biomolecules. This review provides a comprehensive analysis of ultrasound-assisted modifications in carbohydrates and the changes in functional properties induced by sonication.
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Affiliation(s)
- Nirmal Thirunavookarasu
- Department of Food Safety and Quality Testing, National Institute of Food Technology Entrepreneurship and Management - Thanjavur (NIFTEM - T), Tamil Nadu, 613005, India; Center of Excellence in Non-Thermal Processing, National Institute of Food Technology Entrepreneurship and Management - Thanjavur (NIFTEM - T), Tamil Nadu, 613005, India
| | - Sumit Kumar
- Department of Food Safety and Quality Testing, National Institute of Food Technology Entrepreneurship and Management - Thanjavur (NIFTEM - T), Tamil Nadu, 613005, India; Center of Excellence in Non-Thermal Processing, National Institute of Food Technology Entrepreneurship and Management - Thanjavur (NIFTEM - T), Tamil Nadu, 613005, India
| | - Prakyath Shetty
- Department of Food Safety and Quality Testing, National Institute of Food Technology Entrepreneurship and Management - Thanjavur (NIFTEM - T), Tamil Nadu, 613005, India; Center of Excellence in Non-Thermal Processing, National Institute of Food Technology Entrepreneurship and Management - Thanjavur (NIFTEM - T), Tamil Nadu, 613005, India
| | - Akalya Shanmugam
- Center of Excellence in Non-Thermal Processing, National Institute of Food Technology Entrepreneurship and Management - Thanjavur (NIFTEM - T), Tamil Nadu, 613005, India; Food Processing Business Incubation Centre, National Institute of Food Technology Entrepreneurship and Management - Thanjavur (NIFTEM - T), Tamil Nadu, 613005, India
| | - Ashish Rawson
- Department of Food Safety and Quality Testing, National Institute of Food Technology Entrepreneurship and Management - Thanjavur (NIFTEM - T), Tamil Nadu, 613005, India; Center of Excellence in Non-Thermal Processing, National Institute of Food Technology Entrepreneurship and Management - Thanjavur (NIFTEM - T), Tamil Nadu, 613005, India.
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Zhang L, Jin TL. Predictive value and accuracy of prenatal four-dimensional color ultrasound for fetal abnormal development. Medicine (Baltimore) 2023; 102:e34553. [PMID: 37565886 PMCID: PMC10419341 DOI: 10.1097/md.0000000000034553] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/25/2022] [Accepted: 07/12/2023] [Indexed: 08/12/2023] Open
Abstract
To investigate the value and accuracy of prenatal GE-E10 ultrasound Equipment in predicting fetal abnormal development. 160 pregnant women and women who received prenatal ultrasound examination were selected. Before delivery, all pregnant women were examined by conventional two-dimensional and four-dimensional (4D) ultrasound. 18 fetuses with abnormal development were detected by gold standard in 160 pregnant women. Sensitivity and specificity of two-dimensional color ultrasound in diagnosing fetal abnormal development were 78.38% and 82.60%. The sensitivity and specificity of 4D color ultrasound in diagnosing fetal abnormal development were 81.15% and 83.43%. ROC showed that the AUC (0.873) of 4D color ultrasound was higher than that of two-dimensional color ultrasound (0.827). The diagnostic efficiency of 4D ultrasound is greater. The accuracy, specificity and sensitivity of 4D color ultrasound in the diagnosis of fetal abnormal development is high, and it is valuable for prenatal screening of macrosomia and low birth weight.
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Affiliation(s)
- Li Zhang
- Department of Ultrasound, Affiliated Hospital of Inner Mongolia University for the Nationalities, Tongliao 028000, China
| | - Tian-liang Jin
- Department of Ultrasound, Affiliated Hospital of Inner Mongolia University for the Nationalities, Tongliao 028000, China
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Xiao H, Feng J, Peng J, Wu P, Chang Y, Li X, Wu J, Huang H, Deng H, Qiu M, Yang Y, Du B. Fuc-S-A New Ultrasonic Degraded Sulfated α-l-Fucooligosaccharide-Alleviates DSS-Inflicted Colitis through Reshaping Gut Microbiota and Modulating Host-Microbe Tryptophan Metabolism. Mar Drugs 2022; 21:md21010016. [PMID: 36662189 PMCID: PMC9863236 DOI: 10.3390/md21010016] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2022] [Revised: 12/20/2022] [Accepted: 12/21/2022] [Indexed: 12/28/2022] Open
Abstract
SCOPE The dysbiosis of intestinal microecology plays an important pathogenic role in the development of inflammatory bowel disease. METHODS AND RESULTS A polysaccharide named Fuc-S, with a molecular weight of 156 kDa, was prepared by the ultrasonic degradation of fucoidan. Monosaccharide composition, FTIR, methylation, and NMR spectral analysis indicated that Fuc-S may have a backbone consisting of →3)-α-L-Fucp-(1→, →4)-α-L-Fucp-(1→ and →3, 4)-α-D-Glcp-(1→. Moreover, male C57BL/6 mice were fed three cycles of 1.8% dextran sulfate sodium (DSS) for 5 days and then water for 7 days to induce colitis. The longitudinal microbiome alterations were evaluated using 16S amplicon sequencing. In vivo assays showed that Fuc-S significantly improved clinical manifestations, colon shortening, colon injury, and colonic inflammatory cell infiltration associated with DSS-induced chronic colitis in mice. Further studies revealed that these beneficial effects were associated with the inhibition of Akt, p-38, ERK, and JNK phosphorylation in the colon tissues, regulating the structure and abundance of the gut microbiota, and modulating the host-microbe tryptophan metabolism of the mice with chronic colitis. CONCLUSION Our data confirmed the presence of glucose in the backbone of fucoidan and provided useful information that Fuc-S can be applied as an effective functional food and pharmaceutical candidate for IBD treatment.
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Affiliation(s)
- Haitao Xiao
- School of Pharmaceutical Sciences, Health Science Center, Shenzhen University, Shenzhen 518060, China
| | - Jinxiu Feng
- Hebei Key Laboratory of Natural Products Activity Components and Function, Hebei Normal University of Science and Technology, Qinhuangdao 066004, China
| | - Jiao Peng
- Department of Pharmacy, Peking University Shenzhen Hospital, Shenzhen 518036, China
| | - Peigen Wu
- School of Pharmaceutical Sciences, Health Science Center, Shenzhen University, Shenzhen 518060, China
- School of Pharmaceutical Sciences, Guizhou Medical University, Guiyang 550031, China
| | - Yaoyao Chang
- School of Pharmaceutical Sciences, Health Science Center, Shenzhen University, Shenzhen 518060, China
| | - Xianqian Li
- School of Pharmaceutical Sciences, Health Science Center, Shenzhen University, Shenzhen 518060, China
| | - Jinhui Wu
- Hebei Key Laboratory of Natural Products Activity Components and Function, Hebei Normal University of Science and Technology, Qinhuangdao 066004, China
| | - Haifeng Huang
- School of Pharmaceutical Sciences, Health Science Center, Shenzhen University, Shenzhen 518060, China
| | - Huan Deng
- School of Pharmaceutical Sciences, Health Science Center, Shenzhen University, Shenzhen 518060, China
| | - Miao Qiu
- School of Pharmaceutical Sciences, Health Science Center, Shenzhen University, Shenzhen 518060, China
| | - Yuedong Yang
- Hebei Key Laboratory of Natural Products Activity Components and Function, Hebei Normal University of Science and Technology, Qinhuangdao 066004, China
- Correspondence: (Y.Y.); (B.D.); Tel.: +86-335-8077682 (B.D.)
| | - Bin Du
- Hebei Key Laboratory of Natural Products Activity Components and Function, Hebei Normal University of Science and Technology, Qinhuangdao 066004, China
- Correspondence: (Y.Y.); (B.D.); Tel.: +86-335-8077682 (B.D.)
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Recent advances in qualitative and quantitative analysis of polysaccharides in natural medicines: A critical review. J Pharm Biomed Anal 2022; 220:115016. [PMID: 36030753 DOI: 10.1016/j.jpba.2022.115016] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Revised: 08/17/2022] [Accepted: 08/19/2022] [Indexed: 11/20/2022]
Abstract
Polysaccharides from natural medicines, being safe and effective natural mixtures, show great potential to be developed into botanical drugs. However, there is yet one polysaccharide-based case that has fulfilled the Botanical Guidance definition of a botanical drug product. One of the reasons is the analytical methods commonly used for qualitative and quantitative analysis of polysaccharides fall far behind the quality control criteria of botanical drugs. Here we systemically reviewed the recent advances in analytical methods. A critical evaluation of the strength and weaknesses of these methods was provided, together with possible solutions to the difficulties. Mass spectrometry with or without robust chromatographic separation was increasingly employed. And scientists have made significant progress in simplifying polysaccharide quantification by depolymerizing it into oligosaccharides. This oligosaccharides-based strategy is promising for qualitative and quantitative analysis of polysaccharides. And continuous efforts are still needed to develop a standardized quality control method that is specific, accurate, repeatable, and applicable for analyzing individual components in natural medicine formulas.
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Guan L, Zeng Z, Zhao R, Hu S, Liu W, Tian D. Aggregation-induced emission of active nanoparticles based on konjac glucomannan: Fabrication, properties, and applications. POLYMER 2022. [DOI: 10.1016/j.polymer.2022.124978] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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A γ-PGA/KGM-based injectable hydrogel as immunoactive and antibacterial wound dressing for skin wound repair. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2021; 129:112374. [PMID: 34579893 DOI: 10.1016/j.msec.2021.112374] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2021] [Revised: 08/06/2021] [Accepted: 08/10/2021] [Indexed: 12/20/2022]
Abstract
Injectable hydrogels, of which the cover area and volume can be flexibly adjusted according to the shape and depth of the wound, are considered to be an ideal material for wound dressing. Konjac glucomannan (KGM) is a natural polysaccharide with immunomodulatory capability, while γ-polyglutamic acid (γ-PGA) is a single chain polyamino acid with moisturizing, water-retention and antibacterial properties. This work intended to combine the advantages of the two materials to prepare an injectable hydrogel (P-OK) by mixing the adipic acid dihydrazide (ADH) modified γ-PGA with oxidized KGM. The chemical structures, the physical and chemical properties, and the biological properties of the P-OK hydrogel were evaluated. The optimal conditions to form the P-OK hydrogel were fixed, and the cytotoxicity, qPCR, antibacterial and animal experiments were performed. Results showed that the P-OK hydrogel had a fast gelation time, good water-retention rate, little cytotoxicity, good immunomodulating and antibacterial capabilities, and could shorten the healing period in the rat full-thickness defect model, which makes it a potential candidate for wound repair dressing.
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Tecson MG, Abad LV, Ebajo VD, Camacho DH. Ultrasound-assisted depolymerization of kappa-carrageenan and characterization of degradation product. ULTRASONICS SONOCHEMISTRY 2021; 73:105540. [PMID: 33812249 PMCID: PMC8053803 DOI: 10.1016/j.ultsonch.2021.105540] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2020] [Revised: 02/24/2021] [Accepted: 03/23/2021] [Indexed: 05/24/2023]
Abstract
Degradation of polysaccharides to afford low-molecular-weight oligosaccharides have been shown to produce new bioactivities that are not present in the starting material. The simplicity of ultrasonic treatment in the degradation of a polysaccharide, such as κ-carrageenan, offers practical advantage in producing degraded products with lower molecular weight that may have new interesting potential activities. This study embarked on investigating the effects in molecular weights and structural changes of κ-carrageenan under varying ultrasonic conditions. Molecular weight (MW) monitoring of ultrasonically-treated κ-carrageenan at various conditions were done by gel permeation chromatography. The product formed using the optimized condition was characterized using FTIR and NMR. The decrease in MW has been shown to be dependent on low concentration (5.0 mg mL-1), high amplitude (85%), and long treatment time (180 mins) to afford a degraded κ-carrageenan with average molecular weight (AMW) of 41,864 Da, which is a 96.33% reduction from the raw sample with initial AMW of 1,139,927 Da. Structural analysis reveals that most of the peaks of the raw κ-carrageenan was retained with minor change. 1D and 2D NMR analyses showed that the sonic process afforded a product where the sulfate group at the G4S-4 position was cleaved forming a methylene in the G4S ring. The results would be useful in the structure-activity relationship of κ-carrageenan oligosaccharides and in understanding the effect in the various potential applications of degraded κ-carrageenan.
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Affiliation(s)
- Mariel G Tecson
- Chemistry Department, De La Salle University, 2401 Taft Avenue, Manila 0922, Philippines
| | - Lucille V Abad
- Philippine Nuclear Research Institute, Department of Science and Technology, Commonwealth Avenue, Quezon City 1101, Philippines
| | - Virgilio D Ebajo
- Central Instrumentation Facility, De La Salle University Laguna Campus, LTI Spine Road, Barangays Biñan and Malamig, Biñan, Laguna 4024, Philippines
| | - Drexel H Camacho
- Chemistry Department, De La Salle University, 2401 Taft Avenue, Manila 0922, Philippines; Central Instrumentation Facility, De La Salle University Laguna Campus, LTI Spine Road, Barangays Biñan and Malamig, Biñan, Laguna 4024, Philippines; Organic Materials and Interfaces Unit, CENSER, De La Salle University, 2401 Taft Avenue, Manila 0922, Philippines.
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Acylation modification of konjac glucomannan and its adsorption of Fe (Ⅲ) ion. Carbohydr Res 2020; 497:108133. [PMID: 32891933 DOI: 10.1016/j.carres.2020.108133] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2020] [Revised: 08/11/2020] [Accepted: 08/11/2020] [Indexed: 11/21/2022]
Abstract
A biodegradable adsorbent, modified konjac glucomannan (MKGM), was prepared by konjac glucomannan (KGM) acylated with phthalic anhydride catalyzed using concentrated sulfuric acid. The modified conditions such as reaction temperature, mass ratio of phthalic anhydride to KGM, catalyst dosage and reaction time were investigated, respectively. MKGM exhibited preferable adsorption performance for the removal of Fe (Ⅲ) ion. The adsorption behavior was discussed using the Langmuir and Freundlich isotherm models. The results showed that the Freundlich linear model was suitable for describing the adsorption process of Fe (Ⅲ). The maximum adsorption capacity of MKGM for Fe (Ⅲ) ion was 31.87 mg g-1 at 298 K. The kinetics studies suggested that adsorption process followed the pseudo-second-order model and the adsorption process was mainly controlled by both surface reactivity and intra-particle diffusion. Together with the evaluation of the thermodynamic parameters such as Gibbs free energy, enthalpy and entropy changes, the results indicated that the adsorption process of Fe (Ⅲ) was endothermic, feasible, and spontaneous in nature. Hence, as a bioadsorbent, the MKGM has a promising potential for the removal of Fe (Ⅲ) ion from aqueous solutions.
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Ascorbic acid induced degradation of polysaccharide from natural products: a review. Int J Biol Macromol 2020; 151:483-491. [DOI: 10.1016/j.ijbiomac.2020.02.193] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2020] [Revised: 02/09/2020] [Accepted: 02/17/2020] [Indexed: 02/06/2023]
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Effect of Ultrasound-Treated Arabinoxylans on the Oxidative Stability of Soybean Oil. Antioxidants (Basel) 2020; 9:antiox9020147. [PMID: 32050540 PMCID: PMC7070310 DOI: 10.3390/antiox9020147] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2019] [Revised: 01/22/2020] [Accepted: 01/31/2020] [Indexed: 12/11/2022] Open
Abstract
Arabinoxylans (AX) are polysaccharides with antioxidant activity and emulsifying properties, which make them an attractive alternative for its potential application as a natural antioxidant in oils. Therefore, this work aimed to investigate the effect of ultrasonic treatment of AX on their antioxidant capacity and its ability to improve the oxidative stability of soybean oil. For this purpose, AX were exposed to ultrasonic treatment at 25% (100 W, AX-1) and 50% (200 W, AX-2) power and an operating frequency of 20 KHz during 15 min, and their macromolecular properties (weight average molecular weight (Mw), polydispersity index and intrinsic viscosity) were evaluated. The antioxidant capacity of AX was determined by the DPPH assay and Rancimat test. Results showed that ultrasonic treatment did not affect the molecular identity of the polysaccharide but modified its Mw distribution. AX-1 showed the highest antioxidant activity (75% inhibition) at 533 µg/mL by the DPPH method compared to AX and AX-2. AX at 0.25% (w/v) and AX-1 at 0.01% (w/v) exerted the highest protective effects on oxidative stability of soybean oil with induction periods of 7.69 and 5.54 h, respectively. The results indicate that AX could be a good alternative for the potential application as a natural antioxidant in oils.
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