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`Search Results for 'lisinopril'
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`New Analysis Method for the Determina on of Lisinopril in Human EDTA K3 Plasma using Mul Probe II Automated Extrac on, Deriva za on and LC/MS/MS Detec on.
`Collec on: AAPS 2005
`Abstract:
`Purpose Lisinopril is an angiotensin conver ng enzyme (ACE) inhibitor. It is used to treat elevated blood pressure and heart failure. The
`purpose of this work was to develop and validate a specific and robust method for the determina on of lisinopril in human EDTA K3 plasma.
`Methods Lisinopril and its internal standard were extracted from human EDTA K3 plasma using Strata X extrac on plates on Mul PROBE II
`system. Compounds were eluted with a mixture of methanol and hydrochloric acid and then methylated. Analysis was performed on a MDS
`Sciex API 3000 tandem mass spectrometer with TurboIonSpray interface. Posi ve ions were measured with m/z 434.2 &[rarr] 84.1 for
`lisinopril. The chromatographic run me was 4.0 minutes on a Gemini column. A gradient of type I grade water, methanol and ammonium
`acetate 5 mM (pH 10.0) was used to elute the compounds. Results This assay was validated over a nominal range of 0.5 to 150 ng/mL.
`Linearity over the calibra on range was > 0.9967. The between‐run accuracy ranged from 99.65 to 101.37% with precision ranging from 5.11
`to 6.42%. The within‐run accuracy ranged from 97.15 to 103.77% with precision ranging from 2.39 to 11.75%. The recovery of analyte and
`internal standard was greater than 71%. No matrix effect on quan ta on was observed. Lisinopril was found to be stable in human EDTA K3
`plasma a er 10 hours at room temperature for short term stability, a er 279 days at ‐20&[deg]C for long term stability, a er 51 hours at
`room temperature for post‐prepara ve stability and a er 4 freeze and thaw cycles at ‐20&[deg]C and ‐80&[deg]C. Dilu on integrity,
`hemolysis effect and matrix selec vity were also demonstrated. Conclusion This method is accurate, reproducible and was successfully
`applied for the analysis of clinical samples.
`Authors:
`Auger, Serge, Théberge, Marie‐Claude, Couture, Jean, Vallée, François
`Affilia ons: SFBC Anapharm
`AAPS2005‐000031.pdf
`
`Effect of Environmental Condi ons on Solid‐State Behavior of Lisinopril Dihydrate
`Collec on: AAPS 2005
`Authors:
`Surana, Rahul, Khekale, Shilpa, Zhu, Jim
`Affilia ons: Forest Research Ins tute
`AAPS2005‐002527.pdf
`
`Dissolu on Method Development for Lisinopril in A Combina on Dosage Form Containing a Lipophilic Component
`Collec on: AAPS 2009
`Abstract:
`Purpose To develop a suitable dissolu on method for an immediate release Lisinopril formula on in combina on with a lipophilic
`component in a capsule. Methods The dissolu on method was developed using USP apparatus I and II (with or without a sinker). In order to
`select dissolu on medium that provides an adequate environment for dissolu on of Lisinopril and dispersion of a lipophilic component, the
`effect of pH was evaluated. Surfactant added to media at various concentra ons were tested. Dissolu on profiles of Lisinopril in
`combina on with lipophilic component generated from different condi ons were compared. Results Lisinopril release was delayed in the
`presence of a lipophilic component. The combina on formula on that contains the highest ra o of lipophilic component to Lisinopril (8:1)
`was affected the worst. The we ng and dispersing of lipophilic component is the rate‐limi ng step of Lisinopril release in the combina on
`formula on. The addi on of surfactant to media wets and disperses the component quickly and effec vely. Although the capsule shell
`dissolved faster using USP basket or paddle with sinker when compared to paddle alone, the lipophilic component did not disperse fast
`enough to allow a quick medium contact for Lisinopril without the surfactant. Medium pH had minimum impact on Lisinopril release, which
`is consistent with the superior and pH‐independent solubility of Lisinopril in aqueous media. The dissolu on rate of Lisinopril in such a
`combina on is fast and reproducible when u lizing USP paddles with selected dissolu on medium containing 1% Tween 80 in 0.1N
`hydrochloric acid. Conclusion The dissolu on of Lisinopril, even though it is highly water soluble, could be delayed in a combina on
`formula on with a lipophilic component. Addi on of surfactant efficiently addresses the issue. A simple and reproducible dissolu on
`method for the hydrophilic component, Lisinopril, in a combina on formula on as discussed above, which contains a lipophilic component,
`was successfully developed.
`Authors: Wang, Lihong
`Affilia ons: GlaxoSmithKline Inc.
`
`Flat Line Capital Exhibit 1026
`Page 7
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`KVK-Tech, Flat Line Capital Exhibit 1026
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`Poster
`Number:
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`T3019
`
`AAPS2009‐001634.pdf
`
`Lisinopril as a liquid dosage form intended for pediatric use
`Collec on: AAPS 2011
`Abstract:
`Purpose The U.S. Na onal Ins tute of Health (NIH) funded the Pediatric Trials Network to design, in part, pediatric liquid dosage forms of
`drugs for commercial produc on. The goal of this project is to develop a diluent for lisinopril and study the stability and palatability
`proper es of the formula on. This study will inves gate the stability of the drug as a func on of pH, temperature, and presence of amino
`acids as stabilizing agents; as well as the presences of different flavorings. Methods Lisinopril solu ons (10mg/10ml) were prepared under
`the following condi ons: four solu ons were prepared in a pH 4.66 buffer solu on and stored at different temperatures (4, 25, 35, 45&
`[deg]C). Three separate solu ons were prepared with buffer adjusted to pH 4.16, 5.15, 5.7 and stored at room temperature (25&[deg]C).
`The remaining three solu ons were prepared with a 3:2 mol ra o of amino acid (glycine, alanine and 50/50 glycine/alanine to lisinopril. The
`lisinopril solu ons were assayed over me using HPLC (UV Detec on and 20% (v/v) acetonitrile/buffer mobile phase). In addi on, five flavors
`were tested with Ora‐Sweet/Ora‐Plus solu ons in order to determine a palatable diluent to mask the taste of the lisinopril solu on. The
`diluents were first tested alone to op mize the product for sweetness, flavor, and consistency. The selected diluent mixtures were then
`tested with lisinopril. The diluent with lisinopril was then assayed using the same HPLC system as stated above. Results The goal is to prepare
`a palatable and stable lisinopril mixture with a shelf life of 18‐24 months that can be scaled for commercial produc on. Stability tes ng as a
`func on of buffer and temperature are ongoing. Once the most stable buffer (pH) solu on is iden fied, stability tes ng will include lisinopril
`with the selected flavoring/diluent. To date, a diluent ra o of 1 drop flavoring:10mL Ora‐Sweet: 10mL Ora‐Plus) mixed in equal parts with a
`2mg/ml solu on of lisinopril yields a palatable dosage form. Conclusion The final prepara on will be one that offers the greatest stability
`and palatability for inclusion in clinical trials outlined by the Pediatric Trials Network (PTN).
`Authors:
`Kibbe, Arthur, VanWert, Adam, Jacobs, Harvey, Bohan, Jefferson, Beidel, Ben
`Affilia ons: Wilkes University
`Poster
`Number: W5015
`AAPS2011‐002534.pdf
`
`Development And Valida on Of A Stability Indica ng Hplc Method For Determina on Of Lisinopril, Lisinopril Degrada on Products And Parabens In A Lisinopril
`Extemporaneous Prepara on For Pediatric Use
`Collec on: AAPS 2002
`Abstract:
`Purpose. Develop and validate a stability indica ng HPLC method for lisinopril, lisinopril degrada on product (DKP), methylparaben and
`propylparaben in a lisinopril extemporaneous prepara on. Methods. Extemporaneous prepara ons for pediatric use are intended to be
`prepared by pharmacists from marketed lisinopril tablets (PRINIVIL®) and two commercially available diluents, Bicitra™ and Ora‐Sweet SF™.
`Reverse‐phase liquid chromatography with a gradient elu on was employed u lizing an Alltech Pla num EPS C8 column and an acidic
`phosphate mobile phase. Results. Resolu on between peaks of interest was shown to be greater than 2.7. Mean recovery of lisinopril over
`the range of 50% to 150% of the method concentra on (0.025 mg/mL) was 99.1% with an RSD of 0.3% (n = 10) and a correla on coefficient
`of 0.9999. Mean recovery for DKP over the range of 0.1% to 1.5% of the lisinopril method concentra on (0.025 mg/mL) was 105.6% with an
`RSD of 2.6% (n = 10) and a correla on coefficient of 0.999. Linearity of response for methylparaben and propylparaben was examined by
`dilu ng appropriate amounts of Ora‐Sweet SF™, which contain both parabens, from 50% to 150% of final target composi on and yielded a
`correla on coefficient of >0.99. Measurement precision was examined using mul ple injec ons of a standard solu on, resul ng in
`acceptable values for lisinopril, DKP, methylparaben and propylparaben with RSDs of 0.2%, 0.6%, 0.2% and 0.4% (n=10), respec vely.
`Method precision was examined by preparing ten lisinopril suspensions samples, yielding RSDs of 0.6%, 0.4% and 2.0% for lisinopril,
`methylparaben and propylparaben, respec vely. Limits of detec on and quan ta on were determined to be 0.03% and 0.1% with a
`minimum signal‐to‐noise ra o of 3 and 13, respec vely. Sample and standard solu on stability was demonstrated for one week under
`ambient temperature and light. Conclusion. Method was found to be acceptable for quan ta on of lisinopril, DKP, methylparaben and
`propylparaben in lisinopril extemporaneous prepara ons for pediatric use.
`Authors:
`Beasley, Christopher A., Mazakas, Jessica, Zhao, Zack, Reed, Robert A.
`Affilia ons: Merck and Co., Inc.
`Poster
`Number:
`
`T2007
`
`AAPS2002‐002262.pdf
`
`Op miza on of On‐Line Solid‐Phase Extrac on for Direct Plasma Injec on Lc/Ms/Ms Analysis of Lisinopril
`Collec on: AAPS 2001
`Abstract:
`Purpose. Combina on of on‐line solid phase extrac on (SPE) with LC/MS/MS provides a means of improving bioanaly cal throughput by
`directly injec ng plasma samples. Selec on and op miza on of SPE columns are among the key factors for successful use of the
`technology. This work reports the comparison of various SPE columns and op miza on for efficient on‐line extrac on of lisinopril in
`human plasma. Methods. Lisinopril samples (500 ng/mL) with enalaprilamaleate as ISTD prepared in blank human EDTA plasma were
`injected onto a Cohesive 2300 HTLC / Sciex API 3000 MS/MS system. A dual column configura on was employed for extrac on by using a
`loop to store elu ng solvent. Loading and extrac ng solvents were 0.1%TFA and 0.1%TFA + 0.5% ammonium hydroxide in methanol,
`respec vely. HPLC separa on was performed on an XBD C‐18 column (3 ´ 4.6 mm, 3.5 mm) with one‐minute solvent gradient from 0.2%
`formic acid in water to methanol. Results. Several reverse phase SPE columns were tested, including Polar Plus C‐18, Cyclone C‐18 (50 ´ 1
`mm, 50 mm), Oasis HLB (50 ´ 1 mm, 30 mm) and Hypersil C‐18 (20 ´ 3 mm, 30 mm). Our results show that lisinopril and
`enalaprilamaleate can be efficiently extracted with these SPE columns under op mized condi ons. It was found that the extrac on
`efficiency was a func on of the loop volume, elu ng me and rela ve flow rate of elu ng pump, which were in turn determined by the
`proper es of compounds as well as the characteris cs of SPE columns. For instance, for the Hypersil column that gave the highest
`extrac on efficiency, a solvent loop of 300 mL had to be used with extended elu on me of 75 seconds due to its large reten on
`capacity. Conclusions. Results suggest that careful op miza on is a key for both achieving high efficient extrac on and obtaining focused
`chromatographic peaks on the analy cal column.
`
`Flat Line Capital Exhibit 1026
`Page 8
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`KVK-Tech, Flat Line Capital Exhibit 1026
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`
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`Authors:
`Zhou, Shaolian, Larson, Mike, Weng, Naidong, Jiang, Xiangyu
`Affilia ons: Covance Laboratories Inc., Madison, WI, USA.
`327.htm
`
`Lisinopril Plasma c Concentra ons and Hypotensive Ac on on Healthy or Hypertensive Subjects
`Collec on: AAPS 2001
`Abstract:
`Purpose. To evaluate the correla on of lisinopril plasma levels to blood pressure varia ons in a group of healthy subjects and
`hypertensive pa ents. Methods. Lisinopril plasma c concentra ons were determined by a validated HPLC‐MS method (range 1.1 – 300
`ng/ml) ; aliquots of plasma spiked with internal standard were deproteinized with trichloroace c acid and separated on a reversed phase
`column. Healthy subjects, 42 male and 42 female, enrolled for bioequivalence studies, received lisinopril 20 mg per os as single
`administra on. Blood samples (n=16) were collected over 144 hours from dosing; blood pressure was measured 9 mes in the same
`interval. Hypertensive pa ents (n=52) having no previous therapy or > 1 month from any other treatment, were enrolled and received in
`the following month a treatment with lisinopril 20 mg/day. Blood pressure was weekly measured (6‐8 hours from last lisinopril dosing).
`Pa ents treated > 2 weeks were considered evaluable ; in case of unsa sfactory pressure control at 2 weeks, a new treatment was
`prescribed. During each visit a blood sample was collected to determine lisinopril in plasma. Results. 28 healthy subjects didn’t show
`significant pressure varia ons upon treatment; a sta s cally significant correla on was observed between hypotensive ac on and
`lisinopril levels. The results in pa ents were more complex, all subjects with low lisinopril levels experienced modest or absent
`hypotensive effect while in the group with higher lisinopril levels s ll 14.6 % didn’t obtain significant hypotensive effects probably due to
`differences in hypertension ethiology. Conclusions. The results above presented put in evidence a correla on between lisinopril
`plasma c levels and hypotensive effect sugges ng that therapeu c drug monitoring can be useful to op mize lisinopril treatment in
`hypertensive pa ents; however due to the complexity of hypertension pathology op mal levels don’t guarantee in all pa ents the
`desired therapeu c effect.
`Authors:
`Savu, Simona M. Rizea, Silvestro, Luigi, Creteanu, Mihai, Bratu, Tanta
`Affilia ons: S‐Pharmacol. Cons. &Res. GmbH, Harpstedt, Germany,, Suceava County Hospital, Suceava, Romania,, Pharma Serv Interna onal, Bucharest,
`Romania.
`764.htm
`
`Sensi ve Detec on of Angiotensin‐Conver ng Enzyme Inhibitor Lisinopril in Human Plasma by Lc‐Ms/Ms.
`Collec on: AAPS 1999
`Abstract:
`
`
`Purpose.
`
`To develop a LC‐MS/MS method for sensi ve and rapid quan ta ve detec on of Lisinopril in human plasma. Methods. Lisinopril in human
`plasma was determined by solid phase extrac on and reverse phase LC‐MS/MS. LC system used Turbo ion spray interface with API III Plus LC‐
`MS/MS system in Posi ve ion detec on and MRM mode. Eight different concentra on standards were used to establish detec on range.
`Three QCs and one matrix blank were checked by the each day calibra on curve. Results. The lower detec on limit is 0.5ng(Lisinopril)/mL
`human plasma. Calibra on curves were established between 0.5‐100ng/mL for human plasma in 3 consecu ve days. The correla on
`coefficients are all 0.997 or greater. The CVs for calibra on standards are <8.73% and the RE are ranged from ‐6.43% to 7.34% for both intra‐
`day and inter‐day analysis. Low LOQs have 6.60% CV and ‐7.90% RE. Conclusions. A sensi ve and rapid LC‐MS/MS method for quan ta ve
`detec on of Lisinopril in human plasma is developed. This quan ta on method of Lisinopril is rapid, accurate, and precise which is greatly
`beneficial to pharmacokine c studies and clinical trials.
`Authors:
`Lu, T S, Beck, S R, Fitzgerald, T J, Li, Y, Li, Y X
`Affilia ons: Ricerca, Inc., Painesville, OH,
`127.htm
`
`Lc/Ms/Ms Method for Quan ta on of Lisinopril in Human Plasma.
`Collec on: AAPS 1999
`Abstract:
`
`
`Purpose.
`
`Lisinopril is an ACE inhibitor used in the treatment of hypertension and conges ve heart failure. The purpose of this study was to develop
`and validate a sensi ve and specific method for the quan ta on of lisinopril in human plasma. Methods. Lisinopril was extracted from
`human plasma (0.5 mL) by solid phase extrac on using C18 cartridges. The compounds were eluted with acidified methanol, evaporated and
`recons tuted in 125 µL of ammonium acetate/methanol. Chromatography was achieved on a PRP‐1 column with a mobile phase of
`acetonitrile/ammonium acetate (10/90). The extracts (70µL) were injected into a PE Sciex API 3000 LC/MS/MS system equipped with a turbo
`ion spray inlet. The ions monitored were m/z 406®84. The run me was 3 minutes per sample and the analyte was quan tated by peak area
`using weighted linear regression (1/C2). Results. The calibra on curves gave correla on coefficients ³ 0.9980 (range of 497 to 99400 pg/mL).
`Between‐ and within‐run accuracy and precision were determined on QC samples. The between‐run accuracy ranged from 95.43 to 102.45%
`with precision (CV%) ranging from 3.27 to 7.34%. The within‐run accuracy ranged from 96.55 to 100.27% with precision ranging from 2.38 to
`4.98%. Mean QCs recovery from human plasma ranged from 75.1 to 82.7%. Biological matrix selec vity was demonstrated using 8 sources
`of human plasma. Lisinopril was stable in human plasma for 24 hours at room temperature, for 43 hours following sample processing and
`a er 3 freeze‐thaw cycles. Conclusions. A rapid, specific, sensi ve and reliable method has been developed, validated and used successfully
`applied to the analysis of plasma samples from bioequivalence studies.
`Authors:
`Vallée, F, Théberge, M C, LeBel, M
`Affilia ons: Anapharm Inc., Sainte‐Foy, PQ, Canada
`1328.htm
`
`Solid‐State Stability of the Crystalline and Amorphous Lisinopril.
`
`Flat Line Capital Exhibit 1026
`Page 9
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`KVK-Tech, Flat Line Capital Exhibit 1026
`Page 9
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`
`
`Collec on: AAPS 1999
`Abstract:
`
`
`Purpose.
`
`To inves gate the influence of physical forms on the solid‐state chemical stability of lisinopril and to study the degrada on kine cs of
`amorphous lisinopril below its glass transi on temperature. Methods. Anhydrous crystalline lisinopril was prepared by the dehydra on of
`lisinopril dihydrate at 100°C over P2O5. Amorphous lisinopril was prepared by lyophiliza on of aqueous lisinopril solu ons. The glass
`transi on temperature (Tg) of amorphous lisinopril was determined by DSC and the moisture sorp on/desorp on isotherms were obtained
`on a VTI moisture balance. The solid‐state degrada on studies of anhydrous crystalline and amorphous lisinopril were carried out in
`desiccators over P2O5 (0% RH) at 80°C, 90°C, 100°C, 105°C and 110°C. The physical stability of amorphous lisinopril during the degrada on
`studies was checked regularly by XRPD. Reverse‐phase HPLC was used to analyze the degrada on of both forms by following the available
`lisinopril. LC‐MS was performed to iden fy the primary degrada on product of lisinopril. Results. The onset glass‐transi on temperature of
`amorphous lisinopril was found to be 128°C. Amorphous lisinopril is hygroscopic and takes up 53% (w/w) moisture at 25°C before
`undergoing crystalliza on. LC‐MS result suggests that the intramolecular cycliza on to form a diketopiperazine is the primary solid‐state
`degrada on pathway for lisinopril. Amorphous lisinopril degrades much faster than the crystalline counterpart. The degrada on of
`amorphous lisinopril under 0% RH seems to follow the first‐order kine cs at the temperatures studied. In addi on, the temperature‐
`dependence of the degrada on of amorphous lisinopril displays Arrhenius kine cs, with an ac va on energy of 29.2 kcal mole‐1.
`Conclusions. Crystalline and amorphous forms are believed to have different molecular mobility. The fact that the anhydrous crystalline and
`amorphous lisinopril differ greatly in their chemical stability suggests that molecular mobility may play an important role in determining the
`solid‐state stability of lisinopril. Further, for amorphous lisinopril, the Arrhenius equa on may be u lized to predict the stability at
`temperatures below the glass‐transi on temperature.
`Authors:
`Hu, Y, Stowell, J G, Morris, K R, Byrn, S R
`Affilia ons: Dept. of Industrial &Physical Pharmacy, Purdue Univ., West Lafaye e, IN,
`2105.htm
`
`A Rugged Method for the Determina on of Lisinopril in Human Plasma by Lc‐Ms‐Ms.
`Collec on: AAPS 1999
`Abstract:
`
`
`Purpose.
`
`To develop a sensi ve method for measuring lisinopril in human plasma using automated solid phase extrac on and LC‐MS‐MS analysis.
`Methods. Human plasma (0.250 mL) containing lisinopril and the internal standard, enalapril, was extracted using 96‐well solid phase
`extrac on format and a Tomtec Quadra 96 worksta on. A er extrac on on a 96‐well LMS extrac on plate, the sample eluent was collected
`in a 96‐well block, evaporated to dryness, and recons tuted in mobile phase. An aliquot of the extract was injected onto a Micromass
`Qua ro II LC‐MS‐MS operated in MRM and turbo ionspray mode and using CEDRA's proprietary Enhanced Ion Focusingä (EIFä ) technology.
`Lisinopril and the internal standard eluted within less than 2.5 minutes. The peak area of the m/z 406®84 lisinopril product ion was
`measured against the m/z 377®234 product ion of the internal standard. The range of quan ta on was 1.00 to 500 ng/mL, based on the
`analysis of 0.250 mL of plasma. Results. The method was found to be linear over the calibra on curve range for all three valida on days. The
`lower limit of quan ta on was established at 1.00 ng/mL for lisinopril. Over the three days of valida on, the calibra on standard inter‐day
`precision (% RSD) was £ 10.8%. The intra‐day precision over the three valida on days was £ 14.4%. The inter‐day accuracy (percent
`difference from theore cal) over the calibra on curve range was 3.1% or less and for intra‐day was 7.0% or less. Quality control samples
`gave comparable results for precision and accuracy. Quality control sample stability studies (room temperature, freeze/thaw, extract, and
`long term stability) indicated lisinopril was stable under these stress condi ons. Mean recoveries were 81% for lisinopril and 96% for the
`internal standard. Conclusions. These results indicates successful incorpora on of 96‐well extrac on technology with LC‐MS‐MS for a fast,
`precise, and accurate method for the determina on of lisinopril in human plasma.
`Authors:
`Sullivan, M P, Groeber, E A, Bugge, C J L, Garcia, D B
`Affilia ons: CEDRA Corpora on, Aus n, TX,
`2260.htm
`
`Human Jejunal Permeabili es of Lisinopril and Losartan
`Collec on: AAPS 1998
`Authors:
`Lennernäs, H., Knutson, L., Hussain, A. S., Lesko, L., Salmonson, T., Amidon, G. L.
`Affilia ons: Dept. of Pharmacy, University of Uppsala, Sweden, Dept. of Surgery, University of Uppsala, Sweden, Center for Drug Evalua on and
`Research, FDA, USA, Medical Product Agency, Sweden
`1013.html
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`Quan ta ve Determina on of Lisinopril in Human Plasma Using Lc/Ms/Ms Technique
`Collec on: AAPS 1998
`Authors:
`Zhang, Yizhong, Ionita, Antoaneta, Lamarche, Mar ne, Kavetskaia, Olga
`Affilia ons: LAB Pharmacological Research Int'l Inc., Vaudreuil, Quebec, Canada JV P
`2389.html
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`Controlled Release Lisinopril Matrices Compacted from Spheres
`Collec on: AAPS 2013
`Abstract:
`Purpose The purpose of this study was to determine the effect of the wax level, the type of excipient and the exposure of the tablets to
`thermal treatment on drug release. Methods Spheres containing Lisinopril were prepared by extrusion and marumariza on with different
`wax levels and excipients and were compacted into 400mg±5% tablets. Tablets were analyzed to determine the drug release and physical
`proper es, such as friability, disintegra on, weight, thickness, diameter and hardness. Drug release was determined using USP Apparatus #1.
`
`Flat Line Capital Exhibit 1026
`Page 10
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`KVK-Tech, Flat Line Capital Exhibit 1026
`Page 10
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`All tablets contained constant level of Lisinopril, (10% w/w) and Compritol (30% and 50% w/w). Also, as a diluent, all of them contained 30%
`w/w Avicel and 30% w/w Dibasic Calcium Phosphate or Lactose, or 60% Avicel pH‐101. Results Tablets prepared from spheres were uniform
`in weight and total drug percent. Tablets compacted from spheres prepared by extruder/marumarizer and using 30% w/w lipid and 60%
`Avicel, released 84% of drug at 6 hours of tes ng dissolu on, while tablets of the same composi on, but prepared with 30% Dibasic Calcium
`Phosphate and 30% Avicel, released 100%. When the tablets were thermally treated, the drug release reduced and the formula on that
`presented the best drug release was the one that contained 30% Dibasic Calcium Phosphate and 30% Avicel, that released 84% of the drug
`at six hours. The tablets that contained 60% Avicel and 30% lipid, released 100% of the drug at 6 hours of dissolu on, while the tablets that
`contained 40% Avicel and 50% lipid, released 81% of the drug at six hours of dissolu on. As the percent of lipid increased in the formula on,
`the drug release decreased. Conclusion Compac on of tablets prepared from spheres has poten al for controlling the drug release. It is
`possible to modify drug release of tablets by modifying the wax level and excipient type of the formula on.
`Authors:
`Amador, Zoriely, Ghaly, Evone
`Affilia ons: University of Puerto Rico
`Poster
`Number:
`
`T2123
`
`AAPS2013‐001282.pdf
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`Effect of Excipients on the Solid‐State Chemical Stability of Co‐lyophilized Lisinopril Mixtures
`Collec on: AAPS 2015
`Abstract:
`Purpose Previous literature reports have shown the solid‐state chemical reac vity of co‐lyophilized lisinopril with excipients increases in the
`following order: : lisinopril‐trehalose,lisinopril,lisinopril‐PVP. However, a mechanis c understanding of the role of excipients in influencing
`the chemical reac vity of amorphous lisinopril is s ll lacking. The degrada on of lisinopril is proposed to be a two‐step process: (i)
`deprotona on of the reac ng amino group, and (ii) certain molecular mobility is required to bring the reac ng groups in close proximity for
`the intramolecular cycliza on reac on to take place. In this study, we have inves gated the influence of both matrix acidity and molecular
`mobility (both local and global mo ons) on the chemical reac vity of lisinopril. Methods Amorphous lisinopril and solid dispersions of
`lisinopril‐PVP, lisinopril‐trehalose (50:50 weight ra o) were prepared by lyophiliza on. Chemical reac vity studies were performed using
`reversed‐phase high performance liquid chromatography. 13C and 15N solid‐state NMR (SSNMR) spectra were recorded for peak
`assignments and to inves gate changes in local structure and protona on state, while 1H T1 and 13C T1 relaxa on measurements were used
`to probe mobility and miscibility of the dispersions. A 2D 1H–15N cross polariza on heteronuclear correla on (CP‐HETCOR) experiment was
`conducted to confirm the double zwi erionic nature of crystalline lisinopril dihydrate. Global mobility was measured using a calorimetric
`approach. Results Solid dispersions of lisinopril‐PVP and lisinopril‐trehalose exhibited different chemical stability despite similar Tg’s,
`sugges ng Tg alone may not be adequate to evaluate their chemical stability. The es mated structural relaxa on me (global mo ons)
`below Tg follows the same trend as chemical stability (increasing order of stability): lisinopril‐PVP, lisinopril, lisinopril‐trehalose. However, the
`differences observed in the magnitude of structural relaxa on mes do not correlate to the observed chemical stability differences. No
`significant differences were observed in the 13C T1 mes. It was hypothesized that trehalose provides a more acidic environment than PVP,
`thus decreasing forma on of the reac ve mono‐zwi erionic species, leading to reduced chemical reac vity of amorphous lisinopril. 2D 1H–
`15N CP‐HETCOR spectra showed existence of crystalline lisinopril dihydrate as a double zwi erion, whereas the 1D 15N SSNMR spectra of
`amorphous lisinopril indicates that it exists as a mixture of mono‐ and double‐zwi erionic species. The 15N spectra clearly showed
`differences in the extent of protona on in the amorphous samples. The ra o of “mono zwi erion” to “double zwi erion” species was
`approximately 1.18, 0.29 and 0.08 in lisinopril‐PVP, lisinopril, and lisinopril‐trehalose respec vely. This follows the same order as the
`chemical reac vity. Thus, deprotona on of the reac ng amino group is most likely the rate‐limi ng step. Conclusion The chemical reac vity
`was lower in trehalose matrices than in PVP. Three major factors were considered that may affect solid‐state reac vity: glass transi on
`temperature, molecular mobility, and matrix acidity affec ng lisinopril protona on state. Glass transi on temperature does not correlate to
`the chemical stability of amorphous lisinopril in these co‐lyophilized mixtures. The global mo ons followed a similar trend but did not
`convincingly correlate to the observed chemical stability differences. However, trehalose and PVP provided a rela vely acidic and basic
`matrix, respec vely, and affected the rate‐limi ng deprotona on step of the chemical reac on. These results suggest that in order to fully
`understand the chemical reac vity of drug in amorphous solid dispersions, it is important to consider molecular mobility as well as other
`factors contribu ng to the reac on mechanism, such as acid‐base rela onships for ionizable compounds.
`Authors: Mehta, Mehak, Lubach, Joseph, Mao, Chen
`Affilia ons: University of Minnesota, Genentech, Inc.
`Poster
`Number: M1240
`AAPS2015‐M1240.pdf
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`Study of the Effect of Primary Packaging on the Physical Degrada on of Me ormin, Lisinopril, Simvasta n Solid Doses during Pa ent Usage When Stored at Different
`Tem