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Comparative in-vitro Quality Assessment of Cephalexin

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A COMPARATIVE IN-VITRO QUALITY Assessment OF DIFFERENT BRANDS OF COMMERCIALLY AVAILABLE CEPHALEXIN IN KARACHI (PAKISTAN)

 

• SHAHBAZ AHMED NOOR

 

Summary:

Roughly 600 generic drug functions (ANDAs) accepted every year, 65 % of prescriptions are for generic indication from oncology to insomnia with out repeating scientific trials .Each generic molecule references a beforehand accepted drug.

Cephalexin Monohydrates was first bought by Eli Lilly in 1972. The supply of many manufacturers of cephalexin 500 mg capsules in Pakistan market at the moment place healthcare suppliers in a troublesome scenario of alternative of an acceptable model or alternate use chance .The goals of this research was to hold out pharmaceutical equivalence research on completely different manufacturers of cephalexin 500mg capsules out there in native market of Karachi. The invitro parameters embody all pharmacopeia and non-pharmacopeia checks that had been dissolution price( in Zero.1 N Hydrochloric Acid at 37 ⁰C ) ,weight uniformity , disintegration time , moisture content material ( with the Helpance of appropriate Karl Fischer Titrator ) , look (noticed bodily earlier than and after opening of the shell) , Identification ( examine manually retention time in HPLC chromatogram of pattern with chromatogram of reference normal ) and HPLC assay of cephalexin (as describe under primarily based on HPLC assay methodology AM1172) had been additionally analyzed. Together with the inappropriate use of antimicrobials medicine, substandard antibiotic medicines may additionally contribute in resistance improvement in opposition to vulnerable organism.

The research can be useful to guage the efficacy and justification of generic substitution of cephalexin 500 mg capsule manufacturers in Karachi (Pakistan)

INTRODUCTION:

Antibiotic, being the marvel medicine, are broadly prescribed within the growing nations. In actuality, 25 to 40 % prescriptions comprise a number of antibiotic (Public Sector research, 1990-1993)

Antibiotic resistance could be developed via its extensive and inappropriate use with out following any normal pointers. This Alarming scenario has been addressed in a number of scientific journals (Glass et al.,1980; Farrar , 1985; Saha et al., 2003;Lina et al.,2007;Hassan et al.,2009)

Put up –advertising surveillance embody full procedures undertaken to acquire extra information and details about a product after it had been granted advertising authorization and made out there for public use, this information used for product enchancment ,improvement normal and rules. Regulatory businesses depend on restricted data get from scientific trials and from scientific literature as information to granting to advertising authorization of drugs for public use. Put up-marketing surveillance of accepted dosage types is to evaluate the standard, effectiveness and secure use of drugs to massive inhabitants.

To Assess the usual of a product, invitro dissolution take a look at is broadly used as a result of , for any stable dosage types, gastrointestinal absorption first requires dissolution of the pill or capsules that librates the drug into resolution (Goodman & Gilman`s –The Pharmacology foundation of Therapeutics,2006)

The dissolution traits of a drug from the dosage type depend upon many components together with its formulation and manufacturing course of (Augsburger et al., 1983).

Cephalexin

Chemically, Cephalexin is is a primary technology cephalosporins for oral administration which is bactericidal, and primarily used within the therapy of numerous bacterial infections attributable to gram +ve and gram -ve microorganisms. .( Ralph R et.al 1970).Wonderful oral absorption and lack of serum binding of cephalexin compensates considerably for the decrease in vitro exercise.( Warren E. Wick et.al 1967).

Antibacterial Spectrum of Cephalexin: Cephalexin seems to be a extremely efficient antibiotic. It possesses the qualities of fast oral absorption, manufacturing of excessive drug ranges within the blood and urine, and close to absence of negative effects. It’s efficient in opposition to infections as a consequence of gram-positive cocci infections, with the exception of Enterococcus, and for many infections attributable to E. coli and Klebsiella. It’s helpful within the therapy of all kinds of infections in infants and youngsters, and significantly worthwhile with vulnerable infections in sufferers who don’t require parenteral antimicrobial remedy. (R.C. Rudoy, M.D.1977)

The first-generation cephalosporins, epitomized by cephalothin and cefazolin, have good exercise in opposition to gram-positive micro organism and comparatively modest exercise in opposition to gram-negative microorganisms. Most gram-positive cocci (with the exception of enterococci, methicillin-resistant S. aureus, and S. epidermidis) are vulnerable. Most oral cavity anaerobes are delicate, however the B. fragilis group is resistant. Exercise in opposition to Moraxella catarrhalis, E. coli, Okay. pneumoniae, and P. mirabilis is nice (Goodman & Gilman`s –The Pharmacology foundation of Therapeutics,2006)

Literature Survey:

A ) Helio et.al in 2007 On this research, they noticed the antibacterial spectrum of the orally prescribe cephalosporin (cefaclor, cefdinir, cefpodoxime, cefprozil, cefuroxime axetil, cephalexin) and amoxicillin/clavulanate, as these medicine had been broadly prescribed for neighborhood acquired respiratory tract infections. Narrowest zone was of Cefaclor and Cephalexin in opposition to evaluated pathogens. Total, the three^rd Era of cephalosporin is extra helpful in respiratory tracts and different infections when administered orally, as in contrast with older technology or amoxicillin alone.

B ) Chalermporn et.al in 2005 ,they studied for fast and delicate identification of cephalosporins medicine resembling cefoxitin , cefazolin , cephalexin, cefadroxil , cefaclor and cefoperazone, a stream injection (FI) methodology was used. This methodology was utilized efficiently for the identification of cefoxitin, cefazolin, cephalexin, cefadroxil , cefaclor and cefoperazone. The strategy was efficiently relevant for the identification of cefoxitin ,cefazolin , cephalexin and cefadroxil within the pharmaceutical formulation with a pattern throughput of 90h⁻¹.

C ) Rist et.al in 2002, they studied on Oral Cephalexin in contrast with mupirocin calcium cream with respect to security and efficacy in secondarily contaminated eczema therapy. The opposed impact commonest , they noticed was diarrhea and nausea, efficient scientific dose of mupirocin cream was apply 3 times day by day as in comparison with cephalexin orally 4 instances day by day in secondarily contaminated eczma as topical routine was most popular by the affected person that improve affected person compliance.

D ) Lennart Venemalm et.al in 2001, labored for the prognosis of allergy in opposition to β-lactams, prazinone-polylysine conjugate was capable of bind with antibodies IgE in sera from affected person with suspected allergy to cephalosporin’s. This data could also be used for prognosis of allergy in opposition to β-lactams.

E ) Yagnesh P. Patel et.al in 1998 They studied, trendy information on the isocratic assay of 5 antimicrobial medicine ,5 completely different assay had been carried out to 1 single report, antibiotic used on this research had been cephalexin and cefaclor (cephalosporin’s), isoniazid and pyrazinamide (anti-tubercular medicine) and minocycline (tetracycline collection) . Total they concluded that anyone of the drug may very well be used as inner normal for different 4 medicine.

F ) Godfried Owusu-Ababio et.al in 1995 Sustained launch of cephalexin & ciprofloxacin, was evaluated in open chemostat sytem. They concluded that chemostat system is handy for sustained launch drug testing as a perform of formulation parameter.

G ) Anne H. et.al in 1992 On this research, the Cefaclor uptake was noticed & concluded that it was sodium-independent, however proton-dependent and likewise the vitality dependent , dipeptides inhibited uptake of β-lactam antibiotic however amino acid had no impact on uptake , the general information from this research concluded that a single proton-dependent dipeptide transport provider Help the orally absorbed antibiotic uptake into Caco-2 cell & reveals correlation for the use of Caco-2 cell for mobile mannequin of the intestinal proton-dependent dipeptides transporters for research function.

H ) R. Clever et.al in 1991 Cefibuten, invitro exercise was studied in opposition to 572 bacterial pressure and was in contrast with orally administered β-lactams. Cefibuten being extra lively in opposition to Enterobacteriaceae. There was much less exercise of cefibuten & cefexime in opposition to Staphylococci and scale back exercise in opposition to streptococcus pneumonia.

I ) Luis J et.al in 1982 They studied, Acid degradation of cephalexin in presence of formaldehyde, produce 2-Hydroxy-Three-phenyl-6-methylpyrazine.In 5M HCL this product offers properly outlined discount wavelength with half wave potential of -Zero.45 vs. SCE. The wave was diffusion –managed & irreversible, linear relation with the cephalexin conc. was proven with diffusion present and cephalexin in plasma could be decided via it.

J ) Ralph R et.al in 1970 They carried out to detect numerous crystal types of compounds, the employment of solubility versus solvent composition diagram. This seems to be a handy & delicate methodology for detecting new crystalline section.

Goal of Challenge:

1. The target of this research is to hold out pharmaceutical equivalence research on completely different manufacturers of cephalexin 500mg capsules out there in native market of Karachi.
2. The invitro parameters embody all pharmacopeia and non-pharmacopeia checks which are dissolution price, weight uniformity, disintegration time, moisture content material, look, Identification and HPLC assay of cephalexin may even be analyzed.
3. The susceptibility take a look at of drug may even be consider by ICLS ( Previously NCCLS ) Reference Disk Diffusion (Kirby-Bauer) methodology in opposition to completely different scientific isolates of Staphylococcus aureus (03), E. coli (03), Klebsiella pneumonia (03), Pseudomonas aeruginosa (02),

Significance of research:

It is a rising concern that if a well being care supplier, offering the substitute of the generic can also be the Bioequivalent. For the well being care suppliers to make use of these manufacturers interchangeable, the bioequivalence of these manufacturers need to be ascertained, this imply that there ought to be continued submit advertising monitoring of the medicines.

EXPERIMENT:

TESTING PROCEDURE:

Take a look at # 1:

Cephalexin Monohydrate (As base):

Process: Carry out HPLC assay of Cephalexin as describe under primarily based on HPLC assay methodology AM1172.

Take a look at # 2:

Identification:

Process: Evaluate manually retention time in HPLC chromatograms of pattern with chromatograms of reference requirements.

Take a look at # Three:

Moisture Content material:

Process: Thrice individually the moisture content material within the powder of the product with the Helpance of appropriate Karl Fischer Titrator can be decide after which calculate their imply.

Take a look at # four:

Look:

Process: From the 20 capsules take 10 capsules and observe bodily earlier than and after opening of the shells.

Take a look at # 5:

Weight Variation:

From 20 capsules take 10 random capsules from composite pattern and notice particular person weight of crammed capsules. Calculate their common, minimal, most and COV%.

Take a look at # 6:

Disintegration:

Process: Put together a Zero.6% v/v resolution of HCl (Add fastidiously 16.2ml of 37% HCl into 500ml of distilled water after which make the answer as much as 1000ml with distilled water) and fill the vessel of an acceptable disintegration take a look at equipment with this resolution as much as really helpful peak. Preserve the temperature between 35 °C and 39 °C. Place 1 capsule in every of the 6 tubes of the basket and run the tools. Begin the stopwatch and notice the time when all capsules are disintegrated. If 1 or 2 capsules fail to disintegrate, repeat the take a look at on 12 extra capsules. The necessities of the take a look at are met if not lower than 16 of the 18 capsules examined have disintegrated.

Take a look at # 7:

Dissolution:

Process: In line with USP 2007 web page # 1691.

HPLC ASSAY OF CEPHALEXIN BASED ON HPLC ASSAY AM1172 (1.01) FOR

CEPHALEXIN CAPSULES.500 MG / CAPSULES.

I.PRINCIPLE:

The pattern is dissolved in water and the insoluble element eliminated by filtration. An aliquot of the filtrate is diluted with water and examined by reverse section HPLC.

II.APPARATUS

1. An acceptable excessive efficiency liquid chromatographic system geared up with a variable

Wavelength UV Detector.

2. An acceptable analytical steadiness with tolerance of +/- Zero.1 mg.

Three. An acceptable Ultrasonic bathtub.

four. Appropriate Syringes resembling BD, 10ml.

5. Analytical Column: 150 × four.6 mm. i.d stainless-steel column filled with S5 – ODS2 or equal column.

6. Pre-Column: 50 × four.6 mm .i.d stainless-steel column filled with 80µm

Porasil or equal is fitted between the pump and injector.

7 Detector Situation: 254nm vary Zero.5 aufs

Eight. Pump Situation: Movement price 1.Zero ml / minute.

9. Injection quantity: 20µl

10. pH meter.

11. Cell section: See reagents.

B) REAGENTS

1. Cephalexin analytical reference normal
2. Methanol HPLC grade
3. Acetonitrile HPLC grade
4. 1- Hydroxybenzotriazole, Reagent grade.
5. Triethylamine ( T.E.A ) analytical grade
6. Orthophosphoric acid, analytical grade
7. 1- Pentanesulfonic acid, sodium salt, Reagent grade

(Eight) Cell Section:

Dissolve 1g Pentanesulfonic acid sodium salt (Monohydrate) and 15ml of Triethylamine in 850 ml of distilled water, modify the pH to three.Zero with Orthophosphoric acid. Add 50 ml of Methanol and 100 ml of Acetonitrile, Combine properly and degas earlier than use.

Word: Warning ought to be taken when degassing the cellular section to keep away from evaporating the combination.

Inside normal resolution:

Dissolve 1 gm of 1- Hydroxybenzotriazole in 1000ml of cellular section, combine properly.

C) PROCEDURE:

This process comprises the minimal really helpful pattern and normal Preparation for assays carried out manually. Alternate weights and volumes could also be substituted if essential, so long as they’re documented and supply nominally equal focus of the analyte.

1. PREPARATION OF REF. STANDARD SOLUTION

Precisely weigh roughly 32, 40 and 48 mg of Cephalexin reference Commonplace in to into three separate 200ml volumetric flasks respectively, pipette 30 ml of the interior normal resolution in to every flask and swirl to dissolve, Dilute to quantity with distilled water and blend properly.

2. SAMPLE PREPARATION

Take 20 random capsules from composite pattern and notice particular person weight content material of every capsule and decide common content material weight of 20 capsules. Precisely weigh about 500 mg pattern from composite pattern of weight content material of 20 capsules in 500ml volumetric flask and document the burden, add water to dissolve and make up the amount with water as much as 500 ml combine properly and filter. Take 20ml of above dilution in 100ml volumetric flask, add 30ml Inside Commonplace after which add water upto 100ml combine properly and filter via Zero.45µm filter paper.

d) CHROMATOGRAPHY

Make 20 l injection of an ordinary to make sure the chromatography system complies with the system suitability standards. The height tailing shouldn’t be better than 1.5, peak effectivity ought to be better than 4000 plates. The decision between the 2 peaks ought to be better than 2.5. A typical chromatogram is hooked up.

LIMIT OF CEPHALEXIN MONOHYDRATE CONTENT.

CEPHALEXIN THEORY LABEL

500MG / CAPSULE 500MG / CAPSULE

(As Cephalexin anhydrous) ( As Cephalexin anhydrous)

Acceptance Restrict: 475 – 525mg per capsule (95 – 105 %).

Regulatory Restrict: 462.5 – 550 mg per capsule (92.5 – 110 %) (British Pharmacopeia)

REFERENCES:

1. (Augsburger LL,Shangraw RF,Giannini RP, Shah VP, Prasad VK and Brown D (1983) Thiazides VIII: Dissolution Survey of marketed Hydrochlorothiazides tablets. J.Pharma Sci.,72(Eight):876-881)
2. Anne H. Dantzig, Linda B. Tabas, Linda Bergin , Cefaclor uptake by the proton-dependent dipeptide transport carrier of human intestinal Caco-2 cells and comparison to cephalexin uptake Biochimica et Biophysica Acta (BBA) – Biomembranes, Quantity 1112, Problem 2, 9 December 1992, Pages 167-173.
3. Chalermporn Thongpoon, Boonsom Liawruangrath, Saisunee Liawruangrath, R. Alan Wheatley, Alan Townshend , Flow injection chemiluminescence determination of cephalosporins in pharmaceutical preparations using tris (2,2′-bipyridyl) ruthenium (II)-potassium permanganate system , Analytica Chimica Acta, Quantity 553, Points 1-2, 30 November 2005, Pages 123-133.
4. (Farar WE (1985) Antibiotic resistance in growing nations. The Journal of Infectious Ailments,152(6):1103-1106 )
5. (Glass RI, Huq I, Alim ARM and yunus M (1980) Emergence of multiply antibiotic-resistant vibro cholerae in Bangladesh . The Journal of An infection Illness , 142(6):939-942 )
6. (Goodman & Gilman`s-The Pharmacological Foundation of Therapeutics (2006) 11^th Version, McGraw –Hill Medical Publishing Division, Digital Version , Chapter1.)
7. Godfried Owusu-Ababio, James A. Rogers, Hosmin Anwar , Method of Assessment of sustained release microsphere formulations using the open chemostat system.
8. (Goodman & Gilman`s-The Pharmacological Foundation of Therapeutics (2006) 11^th Version)
9. (Hassan SMR, Hossain MM,Akhter R,Karim SMH, Haque S,Kamaluddin M and Ghani A (2009) Sample of antibiotic use on the major well being care stage of Bangladesh : Survey report -1.S.J. Pharm. Sci.2 (1) : 1-7)
10. Helio S. Sader, Michael R. Jacobs, Thomas R. Fritsche, Review of the spectrum and potency of orally administered cephalosporins and amoxicillin/clavulanate, Diagnostic Microbiology and Infectious Illness, Quantity 57, Problem Three, Complement 1, March 2007, Pages S5-S12.
11. (Lina TT,Rahman SR, Gomes DJ(2007) Multi-antibiotic resistance mediated by plasmids and integrons in uropathogenic Escherichia coli and Klebsiella pneumoniea . Bangladesh Journal of Microbiology,24 (1):19-23)
12. Lennart Venemalm , Pyrazinone conjugates as potential cephalosporin allergens

Bioorganic & Medicinal Chemistry Letters, Quantity 11, Problem 14, 23 July

2001, Pages, 1869-1870.

13. Luis J. Nuñez-Vergara, J. A. Squella, M. M. Silva, Polarography of an acidic degradation product from cephalexin, Polarography of an acidic degradation product from cephalexin, Talanta, Quantity 29, Problem 2, February 1982, Pages 137-138s.
14. (Public Sector Drug use research (1990-1993) Worldwide Community for Rational use of Medication, Virginia,USA. )
15. Ralph R. Pfeiffer, Okay. S. Yang, Mary Ann Tucker, Crystal pseudopolymorphism of cephaloglycin and cephalexin, 19 June 1970, 10.1002/jps.2600591222
16. R.C.Rudoy,M.D. 1977, Cephalexin: Scientific and Laboratory Assessment in Infants and Youngsters , Scientific Pediatrics, Vol. 16, No. 7, 639-644 (1977)
17. Rist T, Parish LC, Capin LR, Sulica V, Bushnell WD, Cupo MA, A comparability of the efficacy and security of mupirocin cream and cephalexin within the therapy of secondarily contaminated eczema., 2002-01, Clin Exp Dermatol., 27(1):14-20
18. R.Clever, J. M. Andrews, J. P. Ashby, D. Thornber, Ceftibuten: A new orally absorbed cephalosporin in vitro activity against atrains from the United Kingdom ,Diagnostic Microbiology and Infectious Illness, Quantity 14, Problem 1, January-February 1991, Pages 45-52.
19. (Saha SK Baqui AH, Darmstadt GL, Ruhulamin M, Hanif M,Arifeen SE, Santosham M,Oishi Okay, Nagatake T and Black RE (2003) Composition of carriage and invasive pneumococci amongst Bangladesh youngsters:implication for therapy coverage and vaccine formulation. Journal of Scientific Microbiology,41 (12):5582-5587)
20. Warren E. Wick, Cephalexin, a New Orally Absorbed Cephalosporin Antibiotic , Appl Environ Microbiol. 1967 July; 15(four): 765-769).
21. Yagnesh P. Patel, Nehal Shah, Indravadan C. Bhoir, M. Sundaresan, Simultaneous determination of five antibiotics by ion-pair high-performance liquid chromatography Journal of Chromatography A, Quantity 828, Points 1-2, 18 December 1998, Pages 287-290.

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