pyranose


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pyranose

(ˈpaɪrəˌnəʊs)
n
(Chemistry) chem a compound whose molecular structure contains a saturated pyran ring
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Band at 1031.54 [cm.sup.-1] was attributed to C--O stretching region as complex bands, resulting from C--O and C--O--C stretching vibrations and peak at 822.55 [cm.sup.-1] and 777.42 [cm.sup.-1] was due to pyranose rings.
This increasing redox potential reflects the electron withdrawing properties of heterocyclic pyranose rings.
FTIR spectra of the extracted ChN showed no significant differences between the samples and contained a full set of typical characteristic bands of chitin, such as C-O stretching vibrations of pyranose cycle at 1070 [cm.sup.-1], asymmetric bridge oxygen stretching at 1155 [cm.sup.-1], the vibration of a C=O group bonded to hydroxyl at 1619 [cm.sup.-1], CH bending and symmetric CH3 deformations at 1376 [cm.sup.-1] as well as a set of amide bands: Amide I at 1654 [cm.sup.-1], Amide II at 1553 [cm.sup.-1] and Amide III at 1309[cm.sup.-1] [37].
The bands observed from 600 [cm.sup.-1] to 1150 [cm.sup.-1] are characteristic of the starch and are also called starch fingerprints due to their furanose and pyranose rings.
There are 30 AA genes in this genome including 5 AA1 (multicopper oxidases), 2 AA2 (lignin-modifying peroxidases), 11 AA3 (glucose-methanol-choline oxidoreductase including cellobiose dehydrogenase, aryl-alcohol oxidase/glucose oxidase, alcohol oxidase, pyranose oxidase), 2 AA4 (vanillyl-alcohol oxidase), 4 AA5 (copper radical oxidases), 1 AA6 (1,4-benzoquinone reductase), 3 AA7 (glucooligosaccharide oxidase), and 2 AA9 (lytic polysaccharide monooxygenase) genes.
The oxidative coupling is mainly induced by the presence of free radical-generating agents, such as enzymes (e.g., glucose oxidase and pyranose 2-oxidase) or chemicals (e.g., hydrogen peroxide).
The weak 1028-1093 [cm.sup.-1] band corresponded to CO-C stretching in the pyranose ring.
The spectra of carboxylated nanocellulose show characteristic bands at 1430 [cm.sup.-1], 1284 [cm.sup.-1], 1163 [cm.sup.-1], 1061 [cm.sup.-1], and 898 [cm.sup.-1] that are attributed to bending vibration of -C6-CH2 group [59], C-C ring starching mode, and C-O-C pyranose ring starching mode of nanocellulose [52], respectively.
Sugar oxazolines are bicyclic molecules having a distorted structure where a six-membered pyranose ring and a five-membered oxazoline ring are fused sharing the anomeric and C2 positions.
plantarum isolated from pellets fed to the calves (incubated in both plain and 2.5% NaCl-MRS agar, Figures 2(a) and 2(b)) yielded the BBL-ID code 011066-3-062 characterized by positive reactions for L-methionine, L-phenylalanine, L-leucine, L-alanine, L-isoleucine, p-n-p-[beta]-D-galactoside, p-n-p-[beta]-D-glucoside, p-n-p-[alpha]-D-glucoside, p-n-p-N- acetylglucosaminide, 4MU-[beta]-D-cellobiopyranoside, furanose, and pyranose. Compared to L.
The chemical structure of DNJ is a glucose analogue with an NH group substituting for the oxygen atom of the pyranose ring [100].
Wave number/[cm.sup.-1] Assignments * 3434 O-H (stretching) 2927 C-H (stretching) 1645, 1542, 1398 C-O (bending vibrations of uronic acids) 1454, 1238 C-H (deformation) 979 pyranose ring 836 a-D-Glucopyranoside bond vibration 665 Se-O-C (asymmetric stretching) * Refer to [24, 25].