1
|
de la Horra AE, Velasco MI, Barrera GN, Steffolani ME, Acosta RH, Ribotta PD, Leon AE. Characterization of gluten-free bulk dough for laminated products. JOURNAL OF FOOD MEASUREMENT AND CHARACTERIZATION 2021. [DOI: 10.1007/s11694-021-00889-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
2
|
Ponsiglione AM, Russo M, Torino E. Glycosaminoglycans and Contrast Agents: The Role of Hyaluronic Acid as MRI Contrast Enhancer. Biomolecules 2020; 10:biom10121612. [PMID: 33260661 PMCID: PMC7759866 DOI: 10.3390/biom10121612] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2020] [Revised: 11/11/2020] [Accepted: 11/26/2020] [Indexed: 12/27/2022] Open
Abstract
A comprehensive understanding of the behaviour of Glycosaminoglycans (GAGs) combined with imaging or therapeutic agents can be a key factor for the rational design of drug delivery and diagnostic systems. In this work, physical and thermodynamic phenomena arising from the complex interplay between GAGs and contrast agents for Magnetic Resonance Imaging (MRI) have been explored. Being an excellent candidate for drug delivery and diagnostic systems, Hyaluronic acid (HA) (0.1 to 0.7%w/v) has been chosen as a GAG model, and Gd-DTPA (0.01 to 0.2 mM) as a relevant MRI contrast agent. HA samples crosslinked with divinyl sulfone (DVS) have also been investigated. Water Diffusion and Isothermal Titration Calorimetry studies demonstrated that the interaction between HA and Gd-DTPA can form hydrogen bonds and coordinate water molecules, which plays a leading role in determining both the polymer conformation and the relaxometric properties of the contrast agent. This interaction can be modulated by changing the GAG/contrast agent molar ratio and by acting on the organization of the polymer network. The fine control over the combination of GAGs and imaging agents could represent an enormous advantage in formulating novel multifunctional diagnostic probes paving the way for precision nanomedicine tools.
Collapse
Affiliation(s)
- Alfonso Maria Ponsiglione
- Department of Electrical Engineering and Information Technology (DIETI), University of Naples “Federico II”, Via Claudio 21, 80125 Naples, Italy;
- Department of Chemical, Materials and Production Engineering, University of Naples Federico II, Piazzale V. Tecchio 80, 80125 Naples, Italy;
| | - Maria Russo
- Department of Chemical, Materials and Production Engineering, University of Naples Federico II, Piazzale V. Tecchio 80, 80125 Naples, Italy;
| | - Enza Torino
- Department of Chemical, Materials and Production Engineering, University of Naples Federico II, Piazzale V. Tecchio 80, 80125 Naples, Italy;
- Interdisciplinary Research Center on Biomaterials, CRIB, Piazzale V. Tecchio 80, 80125 Naples, Italy
- Correspondence: ; Tel.: +39-328-955-8158
| |
Collapse
|
3
|
Towards the development of a supercritical carbon dioxide spray process to coat solid protein particles. J Supercrit Fluids 2018. [DOI: 10.1016/j.supflu.2017.12.014] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
4
|
|
5
|
Toward a detailed characterization of oil adsorbates as "solid liquids". Eur J Pharm Biopharm 2012; 84:172-82. [PMID: 23275113 DOI: 10.1016/j.ejpb.2012.12.008] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2012] [Revised: 12/04/2012] [Accepted: 12/09/2012] [Indexed: 11/21/2022]
Abstract
Solid lipid formulation systems are used to overcome oral bioavailability problems of poorly water-soluble drugs. One promising process is the conversion of a liquid lipid system in a free flowing powder by use of adsorbing excipients. The aim of this study was the detailed characterization of solid-liquid interactions in oil adsorbed to Fujicalin and Neusilin which were manufactured by means of dual asymmetric centrifugation or conventional mortar/pestle blending. The adsorption strength of the excipients was investigated by Benchtop-NMR and ESR spectroscopy revealing the highest adsorption power for the Neusilin products. The adsorbate production methods as well as the storage of the excipients impact their adsorption properties. Environmental scanning electron microscopy (ESEM) and confocal laser scanning microscopy (CLSM) show that dual asymmetric centrifugation leads to a smoothing of the particle surface, whereas the mortar/pestle blending results in an uneven surface and particle destruction. The oil distribution at the particles is inhomogeneous for both production methods. The micropolarity of the adsorbed oil was investigated by ESR spectroscopy and multispectral fluorescence imaging. The adsorbing process on Neusilin leads to an increased micropolarity of the oil component. The release of the oil component in aqueous media could be verified by Benchtop-NMR and multispectral fluorescence imaging.
Collapse
|
6
|
Williams PD, Oztop MH, McCarthy MJ, McCarthy KL, Lo YM. Characterization of Water Distribution in Xanthan-Curdlan Hydrogel Complex Using Magnetic Resonance Imaging, Nuclear Magnetic Resonance Relaxometry, Rheology, and Scanning Electron Microscopy. J Food Sci 2011; 76:E472-8. [DOI: 10.1111/j.1750-3841.2011.02227.x] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
7
|
Linlaud N, Ferrer E, Puppo MC, Ferrero C. Hydrocolloid interaction with water, protein, and starch in wheat dough. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2011; 59:713-719. [PMID: 21175189 DOI: 10.1021/jf1026197] [Citation(s) in RCA: 129] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Interaction of hydrocolloids (xanthan gum, locust bean gum, guar gum, and high-methoxyl pectin) with macrocomponents of dough (water, starch, and protein) was evaluated by different techniques. (1)H spin-spin NMR relaxation assays were applied to study the mobility of the gluten-hydrocolloid-water matrix, and the amount of freezable water was determined by differential scanning calorimetry (DSC). Starch gelatinization parameters (T, enthalpy) were also analyzed by DSC. The influence of additives on the protein matrix was studied by Fourier transform (FT) Raman assays; analysis of the extracted gliadins and glutenins was performed by electrophoresis (SDS-PAGE). A significantly higher molecular mobility was found in matrices containing xanthan gum, whereas pectin led to the lowest molecular mobility. Freezable water showed a trend of increasing in the presence of hydrocolloids, particularly under conditions of water restriction. Starch gelatinization final temperature was decreased when hydrocolloids were added in the presence of enough water. In general, FT-Raman and SDS-PAGE indicated that hydrocolloid addition promoted a more disordered and labile network, particularly in the case of pectin addition. On the other hand, results obtained for dough with guar gum would indicate a good compatibility between this hydrocolloid and the gluten network.
Collapse
Affiliation(s)
- Natalia Linlaud
- CIDCA, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, 47 y 116 1900 La Plata, Provincia Buenos Aires, Argentina
| | | | | | | |
Collapse
|
8
|
Diffusion in macromolecular crowded media: Monte Carlo simulation of obstructed diffusion vs. FRAP experiments. Theor Chem Acc 2010. [DOI: 10.1007/s00214-010-0840-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
9
|
Baratova LA, Fedorova NV, Dobrov EN, Lukashina EV, Kharlanov AN, Nasonov VV, Serebryakova MV, Kozlovsky SV, Zayakina OV, Rodionova NP. N-Terminal segment of potato virus X coat protein subunits is glycosylated and mediates formation of a bound water shell on the virion surface. ACTA ACUST UNITED AC 2004; 271:3136-45. [PMID: 15265033 DOI: 10.1111/j.1432-1033.2004.04243.x] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The primary structures of N-terminal 19-mer peptides, released by limited trypsin treatment of coat protein (CP) subunits in intact virions of three potato virus X (PVX) isolates, were analyzed. Two wild-type PVX strains, Russian (Ru) and British (UK3), were used and also the ST mutant of UK3 in which all 12 serine and threonine residues in the CP N-terminal segment were replaced by glycine or alanine. With the help of direct carbohydrate analysis and MS, it was found that the acetylated N-terminal peptides of both wild-type strains are glycosylated by a single monosaccharide residue (galactose or fucose) at NAcSer in the first position of the CP sequence, whereas the acetylated N-terminal segment of the ST mutant CP is unglycosylated. Fourier transform infrared spectra in the 1000-4000 cm(-1) region were measured for films of the intact and in situ trypsin-degraded PVX preparations at low and high humidity. These spectra revealed the presence of a broad-band in the region of valent vibrations of OH bonds (3100-3700 cm(-1)), which can be represented by superposition of three bands corresponding to tightly bound, weakly bound, and free OH groups. On calculating difference ('wet' minus 'dry') spectra, it was found that the intact wild-type PVX virions are characterized by high water-absorbing capacity and the ability to order a large number of water molecules on the virus particle. This effect was much weaker for the ST mutant and completely absent in the trypsin-treated PVX. It is proposed that the surface-located and glycosylated N-terminal CP segments of intact PVX virions induce the formation of a columnar-type shell from bound water molecules around the virions, which probably play a major role in maintaining the virion surface structure.
Collapse
Affiliation(s)
- Lyudmila A Baratova
- A. N. Belozersky Institute of Physico-Chemical Biology, Moscow State University, Russia.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
10
|
Hsu CI, Lai VMF, Yeh AI, Lii CY. Effects of temperature and glycerol on the de-organisation of hsian-tsao (Mesona procumbens Hemsl) polysaccharide solution by electron spin resonance spectroscopy. Food Hydrocoll 2004. [DOI: 10.1016/s0268-005x(03)00090-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
11
|
Naji L, Schiller J, Kaufmann J, Stallmach F, Kärger J, Arnold K. The gel-forming behaviour of dextran in the presence of KCl: a quantitative 13C and pulsed field gradient (PFG) NMR study. Biophys Chem 2003; 104:131-40. [PMID: 12834833 DOI: 10.1016/s0301-4622(02)00362-9] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Although the gel forming ability of certain polysaccharides in the presence of ions is a well-known phenomenon, detailed physicochemical mechanisms of such processes are still unknown. In this investigation high resolution 13C NMR as well as 1H pulsed field gradient (PFG) NMR were used to investigate the mobility of dextran in the sol and in the gel state. Gel-formation of dextran can be easily induced by the addition of large amounts of potassium chloride. No major differences in the T(1) relaxation times of dextran in the sol and in the gel state could be observed. Accordingly, the analysis of the 13C NMR spectroscopic data did not provide any indication of an observable line-broadening upon gel-formation. However, a KCl concentration dependent decrease of signal intensity in comparison to an internal standard was detected. On the other hand, the PFG NMR studies clearly indicated a gradual diminution of the self-diffusion coefficient of the dextran with increasing molecular weight as well as in the presence of potassium chloride. These measurements revealed in agreement with spectroscopic data that at least one potassium ion per monomer subunit (i.e. one glycopyranose residue) is necessary for gel formation.
Collapse
Affiliation(s)
- L Naji
- Institute of Medical Physics and Biophysics, Medical Faculty, University of Leipzig, Liebigstr. 27, D-04103 Leipzig, Germany
| | | | | | | | | | | |
Collapse
|
12
|
Ostergaard J, Schou C, Larsen C, Heegaard NHH. Effect of dextran as a run buffer additive in drug-protein binding studies using capillary electrophoresis frontal analysis. Anal Chem 2003; 75:207-14. [PMID: 12553753 DOI: 10.1021/ac0261146] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The study of drug-protein interactions by capillary electrophoresis frontal analysis requires establishment of a sufficient mobility difference between the mobility of the ligand and protein. The potential utility of dextran as a run buffer additive to manipulate the electrophoretic mobilities of low molecular weight ligands and protein in capillary electrophoresis frontal analysis binding studies was assessed. It was demonstrated that dextran was effective in improving the separation between the ligands warfarin and flurbiprofen and human serum albumin. Separation of ligand and protein increased with the concentration of added dextran (0-7.5% (w/w)), while molecular weight of the additive (70,000-2,000,000) only had a minor effect. The effect of dextran addition on viscosity and electrophoretic and electroosmotic mobilites was systematically studied. Optimal frontal analysis settings were a compromise between achieving satisfactory separation and acceptable analysis times without loss of plateau peak conditions. No effect of dextran upon the drug-human serum albumin interactions could be detected for the model ligands. Introduction of dextran into the electrophoresis buffer expands the applicability of capillary electrophoresis frontal analysis in drug research to binding interactions between proteins and low molecular weight ligands possessing similar electrophoretic mobilities.
Collapse
Affiliation(s)
- Jesper Ostergaard
- Department of Pharmaceutics, Royal Danish School of Pharmacy, Universitetsparken 2, DK-2100 Copenhagen O, Denmark
| | | | | | | |
Collapse
|
13
|
Trampel R, Schiller J, Naji L, Stallmach F, Kärger J, Arnold K. Self-diffusion of polymers in cartilage as studied by pulsed field gradient NMR. Biophys Chem 2002; 97:251-60. [PMID: 12050014 DOI: 10.1016/s0301-4622(02)00078-9] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Pulsed field gradient (PFG) nuclear magnetic resonance (NMR) was used to investigate the self-diffusion behaviour of polymers in cartilage. Polyethylene glycol and dextran with different molecular weights and in different concentrations were used as model compounds to mimic the diffusion behaviour of metabolites of cartilage. The polymer self-diffusion depends extremely on the observation time: The short-time self-diffusion coefficients (diffusion time Delta approximately 15 ms) are subjected to a rather non-specific obstruction effect that depends mainly on the molecular weights of the applied polymers as well as on the water content of the cartilage. The observed self-diffusion coefficients decrease with increasing molecular weights of the polymers and with a decreasing water content of the cartilage. In contrast, the long-time self-diffusion coefficients of the polymers in cartilage (diffusion time Delta approximately 600 ms) reflect the structural properties of the tissue. Measurements at different water contents, different molecular weights of the polymers and varying observation times suggest that primarily the collagenous network of cartilage but also the entanglements of the polymer chains themselves are responsible for the observed restricted diffusion. Additionally, anomalous restricted diffusion was shown to occur already in concentrated polymer solutions.
Collapse
Affiliation(s)
- Robert Trampel
- Institute of Medical Physics and Biophysics, Medical Faculty, University of Leipzig, Liebigstr. 27, Leipzig, Germany
| | | | | | | | | | | |
Collapse
|
14
|
Capitani D, Crescenzi V, A. A. De Angelis, and, Segre AL. Water in Hydrogels. An NMR Study of Water/Polymer Interactions in Weakly Cross-Linked Chitosan Networks. Macromolecules 2001. [DOI: 10.1021/ma002109x] [Citation(s) in RCA: 64] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- D. Capitani
- Institute of Nuclear Chemistry, CNR, Area della Ricerca di Roma, C.P. 10, 00016 Monterotondo Stazione, Rome, Italy; and Department of Chemistry, University of Rome “La Sapienza”, P.le. A. Moro 5, 00185 Rome, Italy
| | - V. Crescenzi
- Institute of Nuclear Chemistry, CNR, Area della Ricerca di Roma, C.P. 10, 00016 Monterotondo Stazione, Rome, Italy; and Department of Chemistry, University of Rome “La Sapienza”, P.le. A. Moro 5, 00185 Rome, Italy
| | - A. A. De Angelis, and
- Institute of Nuclear Chemistry, CNR, Area della Ricerca di Roma, C.P. 10, 00016 Monterotondo Stazione, Rome, Italy; and Department of Chemistry, University of Rome “La Sapienza”, P.le. A. Moro 5, 00185 Rome, Italy
| | - A. L. Segre
- Institute of Nuclear Chemistry, CNR, Area della Ricerca di Roma, C.P. 10, 00016 Monterotondo Stazione, Rome, Italy; and Department of Chemistry, University of Rome “La Sapienza”, P.le. A. Moro 5, 00185 Rome, Italy
| |
Collapse
|
15
|
Spatially Resolved Transverse Relaxation Times T2 of Human Articular Cartilage – an in vitro and in vivo MRI Study. Z Med Phys 2000. [DOI: 10.1016/s0939-3889(15)70113-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
16
|
Kaufmann J, Möhle K, Hofmann HJ, Arnold K. Molecular dynamics of a tetrasaccharide subunit of chondroitin 4-sulfate in water. Carbohydr Res 1999; 318:1-9. [PMID: 10515047 DOI: 10.1016/s0008-6215(99)00091-9] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Molecular dynamics (MD) simulations on a tetrasaccharide subunit of chondroitin 4-sulfate (CS4) in aqueous solution were carried out to study its interactions with water. Pair distribution functions and diffusion coefficients were calculated from a 4 ns trajectory and the hydration of different molecular groups was analysed. The average values of the interglycosidic torsion angles found in the simulations are phi 13 = -10 degrees, psi 13 = -85 degrees and phi 13 = 80 degrees, psi 13 = 90 degrees for the beta-(1-->3) linkage, and phi 14 = -10 degrees, psi 14 = -70 degrees for the beta-(1-->4) linkage. Hydrophobic patches formed by sugar ring CH groups were found. The diffusion coefficients of the water molecules vary from 1.4 x 10(-9) to 2.3 x 10(-9) m2 s-1 depending on the distances between the water molecules and the atoms of the CS4 molecule and the type of CS4 atoms, respectively. Reorientation correlation times of the water molecules in the vicinity of different CS4 atoms were estimated to be about 1 ps at a polymer concentration of 4 wt.% CS4. The number of hydrogen bonds between the water molecules and the acceptor atoms of CS4 was determined to be about 20 per disaccharide unit, indicating a higher hydration ability of chondroitin sulfate in comparison with non-sulfated oligosaccharides. Substructures, where water molecules are involved in hydrogen bonds to different sugar rings, were found, which may be important for the stabilisation of the secondary structure of the CS4 molecule.
Collapse
Affiliation(s)
- J Kaufmann
- Institute of Medical Physics and Biophysics, Medical Faculty, University of Leipzig, Germany
| | | | | | | |
Collapse
|
17
|
Knauss R, Schiller J, Fleischer G, Kärger J, Arnold K. Self-diffusion of water in cartilage and cartilage components as studied by pulsed field gradient NMR. Magn Reson Med 1999; 41:285-92. [PMID: 10080275 DOI: 10.1002/(sici)1522-2594(199902)41:2<285::aid-mrm11>3.0.co;2-3] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Pulsed field gradient (PFG) nuclear magnetic resonance (NMR) was used to investigate the self-diffusion behavior of water molecules in cartilage, polymeric cartilage components, and different model polymers. The short-time self-diffusion coefficients (diffusion time delta approximately/= 13 msec) are found to decrease steadily with decreasing water content. This holds equally well for cartilage and cartilage components. The short-time diffusion coefficients are subjected to a rather nonspecific obstruction effect and mainly depend on the water content of the sample. The long-time diffusion coefficients in cartilage (delta approximately/= 500 msec), however, reflect structural properties of this tissue. Measurements with varying observation times as well as experiments involving enzymatic treatment of articular cartilage suggest that the collagenous network in cartilage is likely to be responsible for the observed restricted diffusion.
Collapse
Affiliation(s)
- R Knauss
- Institute of Medical Physics and Biophysics, Medical Faculty, University of Leipzig, Germany
| | | | | | | | | |
Collapse
|