1、Microcrystalline Cellulose Cellulose 9004-34-6.DEFINITION Microcrystalline Cellulose is purified, partially depolymerized cellulose prepared by treating alpha cellulose, obtained as a pulp from fibrous plant material, with mineral acids.IDENTIFICATION A. Procedure Iodinated zinc chloride solution: D
2、issolve 20 g of zinc chloride and 6.5 g of potassium iodide in 10.5 mL of water. Add 0.5 g of iodine, and shake for 15 min. Sample: 10 mg Analysis: Place the Sample on a watch glass, and disperse in 2 mL of Iodinated zinc chloride solution. Acceptance criteria: The substance takes on a violet-blue c
3、olor. 氯化锌碘试液：取氯化锌 20g、碘化钾 6.5g，加水 10.5ml。再加碘 0.5g，振摇 15min。测定：取本品 10mg，置表面皿上，加氯化锌碘试液 2ml。标准规定：应变为蓝紫色。Change to read: B. Procedure Sample: 1.3 g of Microcrystalline Cellulose, accurately weighed to 0.1 mg Analysis: Transfer the Sample to a 125-mL conical flask. Add 25.0 mL of water and 25.0 mL of 1.0
4、 M cupriethylenediamine hydroxide solution. Immediately purge the solution with nitrogen, insert the stopper, and shake on a wrist-action shaker, or other suitable mechanical shaker, until completely dissolved. Transfer an appropriate volume of the Sample solution to a calibrated number 150 Cannon-F
5、enske, or equivalent, viscometer. Allow the solution to equilibrate at 25 0.1 for NLT 5 min. Time the flow between the two marks on the viscometer, and record the flow time, t1, in s. 取本品 1.3g，精密称定，置 125mL 具塞锥形瓶中，精密加入水 25ml，再精密加入 1mol/L双氢氧化乙二胺铜溶液 25ml，立即通入氮气以排除瓶中空气，密塞，强力振摇，使微晶纤维素溶解；取适量，置 250.1水浴中，约
6、5min 后，移至刻度为 150 的坎农- 芬斯克毛细管粘度计或同等的黏度计内（毛细管内径为 0.7 1.0mm，选用适宜粘度计常数 K1 ） ，照黏度测定法，于 250.1水浴中测定。记录供试品溶液流经黏度计上下两刻度时的时间t1，按下式计算供试品溶液的运动黏度。 Calculate the kinematic viscosity, (KV)1, of the Microcrystalline Cellulose taken: 微晶纤维素的运动黏度(KV)1 按下式计算：Result = t1 k1 t1 = flow time (s) k1 = viscometer constant (s
7、ee ViscosityCapillary Methods 911 (CN 1-May-2015) ) Obtain the flow time, t2, for 0.5 M cupriethylenediamine hydroxide solutions using a number 100 Cannon-Fenske, or equivalent, viscometer.用刻度为 100 的坎农-芬斯克毛细管粘度计或同等的黏度计测定 0.5M 双氢氧化乙二胺铜溶液流经黏度计上下两刻度时的时间 t2，按下式计算空白溶液的运动黏度。 Calculate the kinematic viscos
8、ity, (KV)2, of the solvent: 空白溶液的运动黏度(KV)2 按下式计算：Result = t2 k2 t2 = flow time for 0.5 M cupriethylenediamine hydroxide solutions (s) t2 =0.5M 双氢氧化乙二胺铜溶液流经黏度计上下两刻度时的时间(s)k2 = viscometer constant k2 =黏度计常数Determine the relative viscosity, rel, of the Microcrystalline Cellulose specimen taken: 按下式计算微晶
9、纤维素的相对黏度 rel：Result = (KV)1/(KV)2 (KV)1 = = kinematic viscosity of the Microcrystalline Cellulose taken (KV)1 =微晶纤维素的运动黏度(KV)2 = = kinematic viscosity of the solvent (KV)1 =空白溶液的运动黏度Determine the intrinsic viscosity, c, by interpolation, using the Intrinsic Viscosity Table in the Reference Tables se
10、ction.在附表中查找特性黏数cCalculate the degree of polymerization, P: 按下式计算聚合度 P：Result = (95) c/WS (100 - %LOD)/100c = intrinsic viscosity c = 特性黏数WS = weight of the Microcrystalline Cellulose taken (g) WS = 微晶纤维素质量(g)%LOD = value obtained from the test for Loss on Drying %LOD = 干燥失重值Acceptance criteria: The
11、 degree of polymerization is not greater than 350. 标准规定：聚合度应不超过 350。IMPURITIES Inorganic Impurities Residue on Ignition 281: NMT 0.1% 本实验依照美国药典炽灼残渣项下方法测定；标准规定：不得过 0.1%。Delete the following: Heavy Metals, Method II 231: NMT 10 ppm(Official 1-Dec-2015) 本实验依照美国药典重金属项下方法 II 测定；(Official 1-Dec-2015)标准规定：
12、不得过 10 ppmSPECIFIC TESTS Microbial Enumeration Tests 61 and Tests for Specified Microorganisms 62: The total aerobic microbial count does not exceed 1000 cfu/g, and the total combined molds and yeasts count does not exceed 100 cfu/g. It meets the requirements of the tests for absence of Staphylococc
13、us aureus and Pseudomonas aeruginosa and for the absence of Escherichia coli and Salmonella species. 本试验依照美国药典微生物限度检查和指定微生物限度 项下方法测定， 微生物限度：需氧菌总数不得过 1000cfu/g，霉菌和酵母菌总数不得过 100cfu/g。不得检出金黄色葡萄球菌、铜绿假单胞菌、大肠埃希菌和沙门菌。 Conductivity /电导率Sample: 5 g 样品：5gAnalysis: Shake the Sample with 40 mL of water for 20 mi
14、n, and centrifuge. Retain the supernatant for use in the pH test. Using an appropriate conductivity meter that has been standardized with a potassium chloride conductivity calibration standard having a conductivity of 100 S/cm, measure the conductivity of the supernatant after a stable reading is ob
15、tained, and measure the conductivity of the water used to prepare the test specimen. Acceptance criteria: The conductivity of the supernatant does not exceed the conductivity of the water by more than 75 S/cm. 取本品 5.0g，加水 40ml，振摇 20min，离心，取一部分上清液测定 PH 用。取合适的电导率仪，用氯化钾溶液标化电导率校正曲线，使电导率为 100S/cm ，取上清液，测
16、定电导率，同法测定制备供试品溶液所用水的电导率，两者之差不得过 75 S/cm。 pH 791: 5.07.5 in the supernatant obtained in the Conductivity test 本实验依照美国药典 PH项下方法测定；供试品溶液：取电导率测定项下离心上清液作为供试品溶液；标准规定：PH 应为 5.07.5 Loss on Drying 731: Dry a sample at 105 for 3 h: it loses NMT 7.0% of its weight, or some other lower percentage, or is within
17、a percentage range, as specified in the labeling. Loss on Drying/干燥失重本实验依照美国药典干燥失重项下方法测定；测定: 取本品于 105 下干燥 3h；标准规定：不得过 7.0%。 Bulk Density 堆密度Analysis: Use a volumeter that has been fitted with a 10-mesh screen. The volumeter is freestanding of the brass or stainless steel cup, which is calibrated to
18、a capacity of 25.0 0.05 mL and has an inside diameter of 30.0 2.0 mm. Weigh the empty cup, position it under the chute, and slowly pour the powder from a height of 5.1 cm (2 in) above the funnel through the volumeter, at a rate suitable to prevent clogging, until the cup overflows. NoteIf excessive
19、clogging of the screen occurs, remove the screen. Level the excess powder, and weigh the filled cup. Calculate the bulk density by dividing the weight of the powder in the cup by the volume of the cup. Acceptance criteria: The bulk density is within the labeled specification. 10 号筛板的容积计，经校准容积为 25.0
20、0.05 mL ，内径为 30.0 2.0 mm 黄铜或不锈钢制圆柱杯。称量圆柱杯质量，放在漏斗下方，在容积计的漏斗上方 5.1 cm 处小心倒入本品，控制速度以免堵塞，直至本品溢出圆柱杯。除去溢出部分，称量装满的圆柱杯重量，计算溶积密度。标准规定： Particle Size Distribution 粒度分布NoteIn cases where there are no functionality-related concerns regarding the particle size distribution of the article, this test may be omitte
21、d. Where the labeling states the particle size distribution, determine the particle size distribution as directed in Particle Size Distribution Estimation by Analytical Sieving 786, or by a suitable validated procedure. Water-Soluble Substances 水中溶解物Sample: 5.0 g Analysis: Shake the Sample with 80 m
22、L of water for 10 min, and pass with the aid of a vacuum through filter paper (Whatman No. 42 or equivalent) into a vacuum flask. Transfer the filtrate to a tared beaker, evaporate to dryness without charring, dry at 105 for 1 h, cool in a desiccator, and weigh. 测定：去本品 5g，加入 80 mL 水，振摇 10 min，减压过滤，滤
23、纸为 Whatman No. 42 或同等规格滤纸，转移滤液至去皮烧杯中，蒸干，105干燥 1h，干燥器中降至室温，称重。Acceptance criteria: The difference between the weight of the residue and the weight obtained from a blank determination does not exceed 12.5 mg (0.25%). 标准规定：残渣重量不得过 12.5 mg (0.25%). Ether-Soluble Substances 乙醚中溶解物Sample: 10.0 g Analysis:
24、 Place the Sample in a chromatographic column having an internal diameter of about 20 mm, and pass 50 mL of peroxide-free ether through the column. Evaporate the eluate to dryness in a previously dried and tared evaporating dish with the aid of a current of air in a fume hood. After all the ether ha
25、s evaporated, dry the residue at 105 for 30 min, cool in a desiccator, and weigh. 样品：10g测定：取样品 10g，置内径为 20 mm 色谱柱中， 50ml 无过氧化物的乙醚洗脱。用预先经过干燥并称重的表面皿收集洗脱液，空气吹干，乙醚全部蒸发后，于 105干燥 30 min，干燥器中降至室温，称重。Acceptance criteria: The difference between the weight of the residue and the weight obtained from a blank d
26、etermination does not exceed 5.0 mg (0.05%). 标准规定：残渣重量不得过 5 mg (0.05%).ADDITIONAL REQUIREMENTS Packaging and Storage: Preserve in tight containers. 密封保存。 Labeling: The labeling indicates the nominal loss on drying, bulk density, and degree of polymerization values. Degree of polymerization complianc
27、e is determined using Identification test B. Where the particle size distribution is stated in the labeling, proceed as directed in the test for Particle Size Distribution. The labeling indicates with which technique the particle size distribution was determined if a technique other than analytical
28、sieving was used; and the labeling indicates the d10, d50, and d90 values and the range for each. Auxiliary Information Please check for your question in the FAQs before contacting USP. Topic/Question Contact Expert Committee Monograph Kevin T. Moore, Ph.D. Manager, Pharmacopeial Harmonization(301)
29、816-8369 (EXC2010) Monographs - Excipients 61 Radhakrishna S Tirumalai, Ph.D. Principal Scientific Liaison(301) 816-8339 (GCM2010) General Chapters - Microbiology 62 Radhakrishna S Tirumalai, Ph.D. Principal Scientific Liaison(301) 816-8339 (GCM2010) General Chapters - Microbiology USP38NF33 Page 6596Pharmacopeial Forum: Volume No. 31(5) Page 1421 Chromatographic Column MICROCRYSTALLINE CELLULOSE Chromatographic columns text is not derived from, and not part of, USP 38 or NF 33.
