Molecular weight of sugars

Molecular ion Chemical ionization using ammonia as reagent gas establishes the molecular weights of sugar acetates. 

AT = AC when C is expressed in moles, if M = molecular weight of sugar m solution,... 

Why is this number the molecular weight of sugar (5) Calculate the theoretical molecular weight of sugar from its formula which is CigHggOn. (6) What was the percentage error in your determination ... 

Glucose, a sugar simpler than sucrose, has a molecular weight of 180 and empirical formula CH20. What is its molecular formula ... 

Molecular weight In general, to deduce the molecular weight of the TMS derivative of sugars, add to 105 the highest mass observed. 

This novel enzyme was the only esterase able to release acetyl from sugar beet pectin and removed about 30% of the total acetyl groups present. It also caused the release of acetyl groups from a range of other acetylated substrates, either synthetic or extracted from plants, in small amounts. PAE had an apparent molecular weight of 60 kDa and showed optimal activity at pH 5.5 and a temperature of 50 C. The enzyme is sensitive to buffer composition and requires a bivalent cation for optimal activity and stability. In purified form this enzyme proved unstable, especially in phosphate buffers. 

Figure 9.2. Chromatogram of a seawater extract (20 ml) sample for amino acids collected at 6 m in the Kiel Fjord. The concentrations of the individual acids were quantified as follows (in nmol/1) meto, 11 asp 34.4 thr, 23.2 ser, 88 glu, 36 gly, 100 ala, 56 vol, 16 ileu, 9.6 leu, 12 galactosamine and amino sugars, 4 tyr, 6.8 phe, 7.2 B-ala, 20.8 a-amino-y, 14.4 orn, 44 lys, 12 hist, 7.2 arg, 8.6 cysS02H, 4 cit, trace tan, cys, trace glucose-amine, trace met, trace urea, trace phosphoserine, trace OH-lys, trace. The total concentration of amino acid in the sample lies around 51 q.g/1, assuming a mean molecular weight of 100. Source [264]...

Rhodopsin is a transmembrane protein linked to 11-c/s-retinal, which, on photoabsorption, decomposes to opsin and all-f/a/75-retinal. Rhodopsin has a molecular weight of about 40,000. Its C-terminus is exposed on the cytoplasmic surface of the disk, and its sugar-containing... 

Musculus and Meyer (12) measured the diffusion rates of some starches and dextrins in 1881. The work was designed to determine the relationship of these "isomeric or polymeric" forms to the simple sugars from which they were formed. They concluded that dextrin molecules must be much larger than those of the sugars. This work, however, preceeded Raoult s (13) development of the cryoscopic technique for the determination of the molecular weights of dissolved substances, and van t Hoff s (14) formulation of the solution laws. Further, since the vapor density method was obviously inapplicable, it was not possible for them to actually determine the degree of polymerization. 

The organic phase indudes aliphatic as well as aromatic adds, alcohols, esters, ethers, sugars and extractives (Table 6.3). Approximately 70 wt.% of the oil has been identified. The molecular weight of the individual components ranges from 18 up to 2000 gram mol-1. In some cases, the oil is an emulsion at microscopic level [58]. 

These two polypeptides have been shown to have identical amino acid composition (Table 9) but to differ from each other in sialic acid content. Da and D4 have 1 and 2 moles of sialic acid per mole of protein, respectively (A5, A6, B9, BIO, E5). A third form without sialic acid has been isolated by preparative isoelectric focusing (A5). Both D3 and D4 have the same NHa-terminal (serine) and COOH-terminal (alanine) amino acid residue and a molecular weight of about 10,000. The complete amino acid sequence has recently been announced (B6) and is reported in Fig. 7. These studies show that the polysaccharide having sialic acid as its terminal sugar, is linked to threonine 74 of the polypeptide chain. 

Figure 3. Gel filtration of alkali-soluble xyloglucan on columns (95 x 1.5 cm) of Sepharose CL-6B. Pea microsomal membranes were incubated for various periods with GDP-[14C]fucose and unlabelled sugar nucleotides. Products were eluted with 0.1 M NaOH in 1 ml fractions. Molecular weights of dextran markers, 1 = 264000 D 2 = 70000 D 3 = 40000 D 4 = 10600 D Glc=glucose. Redrawn from Camirand and Maclachlan (20).

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