聚葡萄糖的FCC（食品化学法典）标准
Polydextro
INS: 1200
CAS: [68424-04-4]
DESCRIPTION
upnp怎么开启Polydextro occurs as an off-white to light tan solid. It is a randomly bonded polymer prepared by the condensation of a melt that consists of approximately 90% D-gluco, 10% sorbitol, and 1% citric acid or 0.1% phosphoric acid on a weight basis. The 1,6-glycosidic linkage predominates in the polymer, but other possible bonds are prent. The product contains small quantities of free gluco, sorbitol, and D-anhydroglucos (levoglucosan), with traces of citric acid or phosphoric acid. It may be partially reduced by transition metal catalytic hydrogenation in an aqueous solution. It may be neutralized with any food-grade ba and decolorized and deionized for further purification. It is very solu
ble in water.
Function Bulking agent; humectant; texturizer
Packaging and Storage Store in tight, light-proof containers.
IDENTIFICATION
A. P ROCEDURE
Sample solution: 100 mg/mL
Analysis: Add 4 drops of 5% aqueous phenol solution to 1 drop Sample solution, then rapidly add 15 drops of sulfuric acid.
Acceptance criterion: A deep yellow to orange color appears.
B. P ROCEDURE
Sample solution: 100 mg/mL
Analysis: While vigorously swirling (vortex mixer), add 1.0 mL of acetone to 1.0 mL of Sample solution. [N OTE: Retain this solution for Identification test C (below).]
Acceptance criterion: The solution remains clear.
C. P ROCEDURE
Analysis: While vigorously swirling, add 2.0 mL of acetone to the retained solution from Identification test B.大舌头歌词
Acceptance criterion: A heavy, milky turbidity develops immediately.
D. P ROCEDURE
Sample solution: 20 mg/mL
Sample: Add 4 mL of alkaline cupric citrate TS to 1 mL of Sample solution. Boil
vigorously for 2 to 4 min. Remove from heat, and allow the precipitate (if any) to
ttle.
Acceptance criterion: The supernatant is blue or blue-green.
ASSAY
P ROCEDURE
前出塞Standard stock solution: 0.2 mg/mL -D-gluco
Standard solutions: 50, 40, 20, 10, and 5 μg/mL -D-gluco: made from Standard stock solution
Sample stock solution: 1.0 mg/mL
Sample solution: 40 μg/mL: made from Sample stock solution
Phenol solution: Add 20 mL of water to 80 g of phenol.
Analysis: On a daily basis, pipet 2.0 mL of each Standard solution and the Sample solutio
n into parate, acetone-free, 15-mL screw-cap vials. Add 0.12 mL of the
Phenol solution, and mix gently. Uncap each vial and rapidly add 5.0 mL of sulfuric acid. Immediately recap each vial, and shake vigorously. [CAUTION: Wear rubber gloves and a safety shield while adding sulfuric acid. ]
Let the vials stand at room temperature for 45 min, then determine the absorbance of each sample at 490 nm in a suitable spectrophotometer, using a Phenol solution–
幼小衔接语文sulfuric acid reagent blank in the reference cell. Repeat the procedure three times and obtain the mean absorbance value. For the standard curve, plot mean
absorbance values versus concentrations, in μg/mL, obtained from triplicate
Standard solutions. Calculate the percent polymer by the formula:
1.05[100(A Y)/(S × C) P G 1.11P L]
1.05 = An experimentally derived correction factor to account for the polymer
(which also contains a small amount of sorbitol) not giving the exact amount
of color given by an equivalent amount of gluco monomers
A = Sample absorbance
Y = The y-intercept of the standard curve
鲜肉小馄饨
S = Slope (approximately 0.02) of absorbance versus gluco concentration,
in g/mL, obtained from the standard curve考核意见怎么写
C = Concentration (g/mL) of the Sample stock solution, adjusted for ash and
穷爸爸富爸爸在线阅读
moisture
P G = Percentage of gluco determined under the test for Monomers (below)
P L = Percentage of levoglucosan determined under the test for Monomers
(below)
1.11 = Conversion factor from levoglucosan, which gives an equivalent
amount of color to an equivalent weight of gluco
Acceptance criterion: NLT 90.0% polymer, calculated on the anhydrous, ash-free basis
叛逆的孩子IMPURITIES
Change to read:
Inorganic Impurities
L EAD
[N OTE: For this test, u reagent-grade chemicals with as low a lead content as is
practicable, as well as high-purity water and gas. Before u in this analysis,
rin all glassware and plasticware twice with 10% nitric acid and twice with 10%
hydrochloric acid, and then rin them thoroughly with high-purity water, preferably obtained from a mixed-bed, strong-acid, strong-ba, ion-exchange cartridge
