Solution NMR Spectroscopy of Food Polysaccharides

Cheng, H. N.; Neiss, Thomas G.

doi:10.1080/15583724.2012.668154

Cited by 240 publications

(196 citation statements)

References 163 publications

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“…Figure 3, signals in the region between 5.3 and 4.5 ppm related to H1-4 and H1-3 are well resolved and indicate α-D-glucans (Synytsya & Novak, 2014). The main signals in the anomeric region correspond to protons bound to C1 in the primary 1→4 glycosidic bond ( =5.36 ppm), and C1 in the branching 1→3 ( = 5.32 ppm), and a small signal at = 4.95 ppm, attributable to 1→6 glycosidic bonds was also observed (Cheng & Neiss, 2012;Zang , Howseman, & Shulman, 1991;Zang, Rothman, & Shulman, 1990). The signals obtained in the spectrum in the ring proton region were poorly resolved due to the overlapping chemical shifts.…”

Section: Nmr Analysismentioning

confidence: 77%

“…The signals obtained in the spectrum in the ring proton region were poorly resolved due to the overlapping chemical shifts. However, it is possible to observe clearly the H4´ peak corresponding to the protons bound to the free C4 non reducing ends ( = 3.41 ppm) and other intense peaks from the H2 (=3.63 ppm), H3 ( =3.95 ppm), H4 ( =3.62 ppm), H5 ( =3.81 ppm) and H6a and H6b ( =3.86 and 3.79 ppm, respectively) (Cheng & Neiss, 2012;Nilsson, Bergquist, Nilsson, & Gorton, 1996;Zang et al, 1990;Zang et al, 1991), but better assignments will require more specific identifications. The intensities of the resonances contain information about the branched structure of the molecule.…”

Section: Nmr Analysismentioning

confidence: 94%

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Lactobacillus plantarum CIDCA 8327: An α-glucan producing-strain isolated from kefir grains

Gangoiti

Puertas

Hamet

et al. 2017

Carbohydrate Polymers

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Lactobacillus plantarum CIDCA 8327 is an exopolysaccharide (EPS)-producer strain isolated from kefir with promising properties for the development of functional foods. The aim of the present study was to characterize the structure of the EPS synthesized by this strain grown in skim milk or semidefined medium (SDM). Additionally, genes involved in EPS synthesis were detected by PCR. L. plantarum produces an EPS with a molecular weight of 10Da in both media. When grown in SDM produce an heteropolysaccharide composed mainly of glucose, glucosamine and rhamnose meanwhile the EPS produced in milk was composed exclusively of glucose indicating the influence of the sugar source. FTIR spectra of this EPS showed signals attributable to an α-glucan. Both by H NMR and methylation analysis it was possible to determine that this polysaccharide is a branched α-(1→4)-d-glucan composed of 80% linear α-(1→4)-d-glucopyranosyl units and 19% (1→4)-d-glucopyranosyl units substituted at O-3 by single α-d-glucopyranosil residues.

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Section: Nmr Analysismentioning

confidence: 77%

Section: Nmr Analysismentioning

confidence: 94%

Lactobacillus plantarum CIDCA 8327: An α-glucan producing-strain isolated from kefir grains

Gangoiti

Puertas

Hamet

et al. 2017

Carbohydrate Polymers

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“…Furthermore, considerable progress has been made during the last decade toward the development of nuclear magnetic resonance (NMR) techniques for the analysis of natural [28] and synthetic polymers [29]. NMR spectroscopy represents a simple and relatively low-cost analytical technique for obtaining unambiguous structural information, making it a basic tool in polymer analysis.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, evaluation and release studies of NIPA nanopolymers presumed for temperature-controlled drug delivery

Gasztych

Valh

Kokol

et al. 2016

J Sol-Gel Sci Technol

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The copolymers of N-isopropyl acrylamide (NIPA) have been studied extensively as drug carriers for antibacterial, cardiovascular, cytostatic, local anesthetic, and nonsteroidal anti-inflammatory agents, to deliver the required therapeutic effect. The aim of this work was to evaluate the effect of a series of newly synthesized thermosensitive polymeric NIPA derivatives on the release rate of naproxen sodium (NS) from hydrogels composed of hydroxypropyl methylcellulose (HPMC). NIPA derivatives P1-P4 were synthesized by precipitation polymerization without an emulsifier, and their structures were evaluated by NMR spectroscopy. Four formulations were prepared with NS (FP1-FP4), and rate of NS release from these systems was evaluated using a modified pharmacopeial method at 22 and 42°C. The release rate of NS followed a similar trend in all four of the formulations assessed at 22°C, which was the same as the reference formulation. However, the release rate of NS at 42°C was clearly faster in the samples containing the thermosensitive polymers P1-P4 compared with the reference formulation. These results clearly demonstrate that the use of thermosensitive polymeric derivatives of NIPA can increase the release rate of NS from hydrophilic gels based on HPMC.Graphical Abstract Diversity of release courses of naproxen sodium evaluated in formulation containing poly(ethylene glycol) dimethacrylate (PDA, left), and comparison of half-release times (T HR , right) of naproxen sodium formulations containing various thermosensitive polymers P1-P4.

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“…Solution NMR can be applied effectively to identify the type, the number, and the proportions of different sugar residues in a polysaccharide as well as different linkage configurations and positions in the polymer (27). We used the technique and the results approved our sugar analysis (5) but the structure of the sample could not be fully determined because of some signal overlaps and low signal to noise ratio.…”

Section: Discussionmentioning

confidence: 99%

Some Physicochemical and Rheological Properties of Zedo (Farsi) Gum Exudates from Amygdalus scoparia

Fadavi¹,

Ghiasi

Zargarran

et al. 2017

Nutr Food Sci Res

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A B S T R A C T Background and Objectives:Zedo gum is exuded in three colours (white, yellow, and red) from Amygdalus scoparia. It is used in both food and non-food industries, as well as in traditional medicine. This study aimed to determine the physicochemical and rheological properties of Zedo gum. Materials and Methods:Zedo gum was collected in Sirjan and classified into three groups, based on colour (samples W, Y, and R). Their soluble parts were separated by centrifuging the dispersions and freeze-drying the supernatants. Surface tension was determined using Du Nouy ring method and NMR spectroscopy was carried out using a Varian Inova-500 MHz spectrometer. Gel Permeation chromatography was used for determining molecular weight and rheological data were obtained with a Physica MCR 301 rheometer.Results: Surface tension decreased as the concentration decreased, except for sample R that had a maximum point at 1 %. The molecular weight of sample W was the highest, while its dispersity was the lowest. NMR spectroscopy indicated that Ara residues variously were linked to α-Araf residues, and Gal residues were determined as terminal α-Gal residues. Intrinsic viscosity values for samples W, Y, and R were 7.14±0.13, 6.45±0.11 and 5.40±0.15dl/gr, respectively. Rheological results showed that viscosity was inversely proportional to temperature and directly to concentration. Conclusions:As three samples of Zedo gum had different characteristics, colour can be a good tool in trade.

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Solution NMR Spectroscopy of Food Polysaccharides

Cited by 240 publications

References 163 publications

Lactobacillus plantarum CIDCA 8327: An α-glucan producing-strain isolated from kefir grains

Lactobacillus plantarum CIDCA 8327: An α-glucan producing-strain isolated from kefir grains

Synthesis, evaluation and release studies of NIPA nanopolymers presumed for temperature-controlled drug delivery

Some Physicochemical and Rheological Properties of Zedo (Farsi) Gum Exudates from Amygdalus scoparia

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