Conductivity as used herein refers to 10 the ability of a solution, such as a buffer solution, to influence electrostaticinteractions, for example binding to or release of, of the contaminants with the matrix. The conductivity may be adjusted by varying ionic concentration of the buffer composition. Generally low conductivity buffers are preferable. By low conductivityit is understood that the conductivity is ต่ำกว่า 10 mS/cm, preferably ต่ำกว่า 5 mS/cm, 15 and most preferably ต่ำกว่า 3 mS/cm. ในหนึ่งใน รูปลักษณะ, the conductivity of the buffer is ระหว่างประมาณ 8 mS/cm ถึงประมาณ 0.5 mS/cm, ระหว่างประมาณ 5 mS/cm to about 1 mS/cm, ระหว่างประมาณ 4 mS/cm ถึงประมาณ 1.5 mS/cm, ระหว่างประมาณ 3 mS/cm ถึงประมาณ 2 mS/cm.20 ในหนึ่งใน รูปลักษณะ, an exemplary buffer contains 10 mM phosphate, pH 5.8 to6.2 with a conductivity of approximately 2 mS/cm.The คอนจูเกต is loaded at the rate of 2-120 cm/hr. Preferably at the rate of 10-120 cm/h, 20-110 cm/h, 30-100 cm/h, 40-90 cm/h, 50-80 cm/h, or 60-70 cm/h. The flow 25 rate can be adjusted so as to allow sufficient time for the contaminants to interact with the matrix. Sample may be loaded at 300 cm/hr or higher with one or more repeated steps of loading. If required, the crude คอนจูเกต may be membrane filtered before loading onto the โครมาโทกราฟี column. The desired คอนจูเกต passes through the void spaces of the mixed mode resin and is collected in the ส่วนไหลผ่าน while the 30 impurities are trapped inside the ligand activated core by hydrophobic and/or ionic interactions. A wash is given to the column using the phosphate buffer, pH 5.8 to 6.2 to collect the remaining คอนจูเกต non-specifically adhering to the matrix. Thepurified คอนจูเกต is diluted with a high conductivity dilution buffer, pH 5.8 to 6.2, and filtered through a 0.45p, and 0.22p, filters.Table-1 โพลีแซคคาไรด์ อิสระ (PRP), Free carrier protein (TT) and EDC content after 5 purification of โพลีแซคคาไรด์ โปรตีน คอนจูเกตโครมาโทกราฟี.Free PRP 6.0 mg/mL (Hib คอนจูเกต) by mixed modeColumn (a) represents the contaminants.Column (b) represents the amount of contaminants before purification of โพลีแซคคาไรด์ โปรตีน คอนจูเกต by mixed mode โครมาโทกราฟี. 15 Column (c) represents the residual amount of contaminants after purification ofโพลีแซคคาไรด์ โปรตีน คอนจูเกต by mixed mode โครมาโทกราฟี.Column (d) represents the percentage of residual amount of contaminants. Column (e) represents the percentage reduction of contaminants.20 Free PRP was determined by the method described by Tsai, C.M. et al. (1994)Vaccine 12(8): 700-706.Free protein in a โพลีแซคคาไรด์ คอนจูเกต vaccine may be determined by the methods known to the persons skilled in the art. The amount of free Tetanus toxoid (free TT) in 25 Hib คอนจูเกต (PRP คอนจูเกตd to tetanus toxoid) was determined by strong anion exchange โครมาโทกราฟี using a fluorescence detector. The molecules with weak ionic interactions are eluted first (free TT) followed by molecules with strong ionicinteractions (Hib คอนจูเกต). The free TT was eluted by lowering the pH of the mobile phase ต่ำกว่า the pI of the tetanus toxoid. The amount of free TT was quantified by comparing the peak area of the sample with the peak area of the standard curve plotted against the concentration (.tg/mL) generated using tetanus toxoid.5Capillary Zone Electrophoresis (CZE) was used to quantify 1-ethy1-3-(3-dimethylaminopropyl) carbodiimide (EDC) by directly detecting in capillaries by UVabsorbance at 200 nm. EDC content in the sample was quantified by comparing peakareas of the sample with the peak areas of the standard curve generated using different10 concentrations of EDC.Table 2 - Molecular size distribution of Hib คอนจูเกต purified by mixed modeโครมาโทกราฟีMolecularFractionation Size SampleABC contentRange in KD (A+13+C) in p.g<0.20.2-0.5 943.10.5-1.0 distribution (%)749.06 79.4104.83 11.189.21 9.5 15 Molecular size distribution of purified Hib คอนจูเกต was analyzed by SepharoseCL4B โครมาโทกราฟี (WHO Technical Report Series, No. 897, 2000 pg 27-56)Three fractions of Size distribution ranges i.e., <0.2, 0.2-0.5 and 0.5-1.0 KD as shown in figure 2 were collected and PRP content was analyzed. The results indicate that79.4 % of คอนจูเกต is in the molecular size range of <0.2 KD indicating that mixed 20 mode โครมาโทกราฟี efficiently removes low molecular weight คอนจูเกต.The การประดิษฐ์นี้ is further exemplified by the following non limiting examples. It should be understood that the examples are provided to illustrate the การประดิษฐ์. From the description and the exemplified embodiments and examples, on skilled inthe art can make various modifications or adaptations to the การประดิษฐ์. Such 25 modifications or adaptations are deemed to be within the scope and the spirit of the การประดิษฐ์.ExamplesExample 1 — Purification of Hib คอนจูเกต using gel filtration โครมาโทกราฟี (3.0 L Scale)The โครมาโทกราฟี column (BPG, GE Healthcare) packed with Sepharose CL-2B5 (GE Healthcare) is equilibrated with equilibration buffer (10 mM Phosphate buffercontaining 0.2 M NaC1). 3000 mL of crude Hib คอนจูเกต (Hib โพลีแซคคาไรด์คอนจูเกตd to tetanus toxoid) is loaded onto the pre equilibrated column. The crudeคอนจูเกต gets fractionated (Fraction-1 to Fraction-4) based upon distributioncoefficient (Kd), from which the desired คอนจูเกต (Fraction-2) is collected in a10 lfowthrough. Rest of the fractions (Fraction-1, Fraction-2 and Fraction-3) containscontaminants (Fig la).Example 2a - Purification of Hib คอนจูเกต using mixed mode โครมาโทกราฟี (0.08 L Scale)15 80 mL of crude Hib คอนจูเกต i.e., Hib โพลีแซคคาไรด์ คอนจูเกตd to tetanus toxoid(concentration 10 mg/mL, pH 5.8 and conductivity 20 mS/cm) is diluted 10 times with equilibration buffer (10 mM Sodium phosphate, pH 5.8 and conductivity 2 mS/cm) and concentrated to approximately five times its volume using 1000 kDacassette (Millipore Biomax). The คอนจูเกต is continuously diafiltered (using 30 kDa 20 membrane) with equilibration buffer for about 20 times and concentrated to its initial volume.
The mixed mode matrix (Capto 11V1 Core 700 matrix, GE Healthcare) packed in BPG
column (GE Healthcare) is equilibrated with equilibration buffer and the คอนจูเกต is 25 loaded at the rate of 10 cm/h. The unbound คอนจูเกต is collected. A wash is given to
the column using the equilibration buffer to collect the remaining คอนจูเกต non-
specifically adhering to the matrix. The คอนจูเกต collected is diluted using phosphate
buffer pH 5.8-6.2 and filtered through 0.45 p. and 0.2 u filter.
Example 2b — Purification of Hib คอนจูเกต using mixed mode โครมาโทกราฟี (3.0 L Scale)
5 3000 mL of crude Hib คอนจูเกต i.e., Hib โพลีแซคคาไรด์ คอนจูเกตd to tetanus toxoid
(concentration 10 mg/mL, pH 5.8 and conductivity 20 mS/cm) is diluted 10 times with equilibration buffer (10 mM Sodium phosphate, pH 5.8 and conductivity 2 mS/cm) and concentrated to approximately 3 times its volume using 1000 kDa
cassette (Millipore Biomax). The คอนจูเกต is continuously diafiltered (using 30 kDa 10 membrane) with equilibration buffer for about 25 times and concentrated to its initial
volume.
The mixed mode matrix (CaptoTm Core 700 matrix, GE Healthcare) packed in
Axichrom column (GE Healthcare) is equilibrated with equilibration buffer and the 15 คอนจูเกต is loaded at the rate of 60 cm/h. The unbound คอนจูเกต is collected. A
wash is given to the column using the equilibration buffer to collect the remaining คอนจูเกต non-specifically adhering to the matrix. The คอนจูเกต is diluted using phosphate buffer pH 5.8-6.2 and filtered through 0.45 11 and 0.2 11 filter.
20 Table 3 — Advantages of using mixed mode โครมาโทกราฟี over gel filtration
โครมาโทกราฟี for คอนจูเกต purification
Gel filtration Mixed mode
S.No. Parameters
1 Batch size
2 Matrix volume used
3 Column height
4 Column diameter
5 buffer requirement
6 Pooling criteria
โครมาโทกราฟี
3.0 L
60.0 L
90 cm
300 mm
1000 L
Specified region of
inner fraction
(contaminants and
คอนจูเกต separate over
a very narrow range
increasing the risk of
contamination, see Fig
1 a.)
โครมาโทกราฟี
3.0 L
3.0 L
18 cm
140 mm
200 L
Unbound fraction
(contaminants and
คอนจูเกต separate over
a broad range reducing
the risk of
contamination, see Fig
lb.)
22
PCT-1424
7
8
9
10
Column packing, unpacking and
chromatographic run operations
Overall process time
Nature of
โครมาโทกราฟี
Principle involved
Cumbersome,
inconvenient and
highly time consuming
operations
6 days
Fractionation by size
exclusion
Size Exclusion
Very simple,
convenient and easy
< 1 day
Negative
โครมาโทกราฟี/non-
binding mode
Size exclusion, ion
exchange &
Hydrophobic
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