Savić, Vedrana

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  • Savić, Vedrana (4)
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Dermalna isporuka takrolimusa - uporedna formulaciona i preklinička istraživanja mikroemulzija, nanoemulzija i nanostrukturiranih lipidnih čestica kao naprednih nosača za slabo rastvorne lekovite supstance

Savić, Vedrana

(Универзитет у Београду, Фармацеутски факултет, 2021)

TY  - THES
AU  - Savić, Vedrana
PY  - 2021
UR  - http://eteze.bg.ac.rs/application/showtheses?thesesId=8413
UR  - https://fedorabg.bg.ac.rs/fedora/get/o:24645/bdef:Content/download
UR  - http://vbs.rs/scripts/cobiss?command=DISPLAY&base=70036&RID=48734473
UR  - https://nardus.mpn.gov.rs/handle/123456789/18775
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/4034
AB  - dermatitisa. Danas je na tržištu registrovan samo jedan farmaceutski oblik sa takrolimusom zaprimenu na koži - mast. Zbog nepoželjnih karakteristika masti (masna tekstura, teško razmazivanje,sporo upijanje, teško spiranje) i težnje da se poboljša njegova isporuka u kožu, sve je veća potrebaza razvojem novih, naprednih nosača sa takrolimusom, kao što su mikroemulzije, nanoemulzije ilipidne nanočestice.Usled njihove kompleksnosti, razvoj ovih nosača je dugotrajan i neizvestan proces. Stoga jecilj ove doktorske disertacije bio formulisanje mikroemulzija, nanoemulzija i nanostrukturiranihlipidnih čestica stabilizovanih lecitinom, kao nosača za dermalnu isporuku takrolimusa.Perspektivni nosači su podvrgnuti sveobuhvatnoj fizičkohemijskoj karakterizaciji i studijistabilnosti, a dermalna isporuka takrolimusa upoređena je sa referentnom mašću.Formulaciona istraživanja omogućila su skupljanje znanja o kritičnim formulacionim iprocesnim parametarima za dobijanje stabilnih nosača sa takrolimusom. U dvočasovnoj in vitrostudiji penetracije takrolimusa u kožu uha svinje korišćenjem metode sa trakama, uočeno je da surazvijeni nosači superiorniji u poređenju sa referentnom mašću i omogućavaju bolju isporukutakrolimusa u stratum corneum. Takrolimus je u značajnoj meri penetrirao u folikule dlaka, štododatno može da osigura bolju dermalnu isporuku. Ipak, rezultati 24-časovne in vitro studijepermeacije kroz kožu uha svinje pune debljine korišćenjem Franz-ovih difuzionih ćelija ukazuju nabolju permeaciju takrolimusa iz mikroemulzije i referentne masti u poređenju sa nanostrukturiranimlipidnim česticama i nanoemulzijom, što može ukazivati i na mogućnost ispoljavanja sistemskihneželjenih efekata.Generalno, rezultati ukazuju na veliki potencijal dobijenih nosača za dermalnu isporukutakrolimusa, što bi trebalo potvrditi odgovarajućim kliničkim eksperimentalnim postavkama.
AB  - Tacrolimus is a potent immunosuppressive macrolide which is topically used for treatment ofatopic dermatitis. Today, there is only one pharmaceutical form for topical application of tacrolimus- tacrolimus ointment. Due to the undesirable characteristics of ointments (greasy texture, difficultyof applying and spreading onto the skin, difficulty to wash them off) and desirable enhancement indermal delivery, there is an emerging need for development of novel carriers for tacrolimus, such asmicroemulsions, nanoemulsions and lipid nanoparticles.Owing to their complexity, the development of these carriers can be a long-lasting anduncertain process. Therefore, the aim of this doctoral thesis was to formulate lecithin basedmicroemulsions, nanoemulsions and nanostructured lipid carriers as novel carriers for dermaldelivery of tacrolimus. The physicochemical characteristics and stability of promising carriers wasassessed, and dermal delivery of tacrolimus was compared to the referent ointment.The formulation evaluation acquired important knowledge about the critical parameters forobtaining stabile carriers with tacrolimus. Results of in vitro penetration of tacrolimus in porcine earskin suggested superiority of the developed carriers compared to the referent ointment.Additionally, the delivery of tacrolimus into the hair follicles was increased as well, which couldprovide better dermal delivery of tacrolimus. On the other hand, the results of 24-hour in vitropermeation study using Franz diffusion cells and full thickness porcine ear skin indicated betterpermeation of tacrolimus from the microemulsion and the referent ointment compared to thenanostructured lipid carrier and the nanoemulsion, which can also suggest a risk of systemicadverse effects by their usage.Overall, the developed carriers could be suggested as promising carriers for dermal deliveryof tacrolimus, which should be confirmed by appropriate clinical evaluation.
PB  - Универзитет у Београду, Фармацеутски факултет
T2  - Универзитет у Београду
T1  - Dermalna isporuka takrolimusa - uporedna formulaciona i preklinička istraživanja mikroemulzija, nanoemulzija i nanostrukturiranih lipidnih čestica kao naprednih nosača za slabo rastvorne lekovite supstance
UR  - https://hdl.handle.net/21.15107/rcub_nardus_18775
ER  - 
@phdthesis{
author = "Savić, Vedrana",
year = "2021",
abstract = "dermatitisa. Danas je na tržištu registrovan samo jedan farmaceutski oblik sa takrolimusom zaprimenu na koži - mast. Zbog nepoželjnih karakteristika masti (masna tekstura, teško razmazivanje,sporo upijanje, teško spiranje) i težnje da se poboljša njegova isporuka u kožu, sve je veća potrebaza razvojem novih, naprednih nosača sa takrolimusom, kao što su mikroemulzije, nanoemulzije ilipidne nanočestice.Usled njihove kompleksnosti, razvoj ovih nosača je dugotrajan i neizvestan proces. Stoga jecilj ove doktorske disertacije bio formulisanje mikroemulzija, nanoemulzija i nanostrukturiranihlipidnih čestica stabilizovanih lecitinom, kao nosača za dermalnu isporuku takrolimusa.Perspektivni nosači su podvrgnuti sveobuhvatnoj fizičkohemijskoj karakterizaciji i studijistabilnosti, a dermalna isporuka takrolimusa upoređena je sa referentnom mašću.Formulaciona istraživanja omogućila su skupljanje znanja o kritičnim formulacionim iprocesnim parametarima za dobijanje stabilnih nosača sa takrolimusom. U dvočasovnoj in vitrostudiji penetracije takrolimusa u kožu uha svinje korišćenjem metode sa trakama, uočeno je da surazvijeni nosači superiorniji u poređenju sa referentnom mašću i omogućavaju bolju isporukutakrolimusa u stratum corneum. Takrolimus je u značajnoj meri penetrirao u folikule dlaka, štododatno može da osigura bolju dermalnu isporuku. Ipak, rezultati 24-časovne in vitro studijepermeacije kroz kožu uha svinje pune debljine korišćenjem Franz-ovih difuzionih ćelija ukazuju nabolju permeaciju takrolimusa iz mikroemulzije i referentne masti u poređenju sa nanostrukturiranimlipidnim česticama i nanoemulzijom, što može ukazivati i na mogućnost ispoljavanja sistemskihneželjenih efekata.Generalno, rezultati ukazuju na veliki potencijal dobijenih nosača za dermalnu isporukutakrolimusa, što bi trebalo potvrditi odgovarajućim kliničkim eksperimentalnim postavkama., Tacrolimus is a potent immunosuppressive macrolide which is topically used for treatment ofatopic dermatitis. Today, there is only one pharmaceutical form for topical application of tacrolimus- tacrolimus ointment. Due to the undesirable characteristics of ointments (greasy texture, difficultyof applying and spreading onto the skin, difficulty to wash them off) and desirable enhancement indermal delivery, there is an emerging need for development of novel carriers for tacrolimus, such asmicroemulsions, nanoemulsions and lipid nanoparticles.Owing to their complexity, the development of these carriers can be a long-lasting anduncertain process. Therefore, the aim of this doctoral thesis was to formulate lecithin basedmicroemulsions, nanoemulsions and nanostructured lipid carriers as novel carriers for dermaldelivery of tacrolimus. The physicochemical characteristics and stability of promising carriers wasassessed, and dermal delivery of tacrolimus was compared to the referent ointment.The formulation evaluation acquired important knowledge about the critical parameters forobtaining stabile carriers with tacrolimus. Results of in vitro penetration of tacrolimus in porcine earskin suggested superiority of the developed carriers compared to the referent ointment.Additionally, the delivery of tacrolimus into the hair follicles was increased as well, which couldprovide better dermal delivery of tacrolimus. On the other hand, the results of 24-hour in vitropermeation study using Franz diffusion cells and full thickness porcine ear skin indicated betterpermeation of tacrolimus from the microemulsion and the referent ointment compared to thenanostructured lipid carrier and the nanoemulsion, which can also suggest a risk of systemicadverse effects by their usage.Overall, the developed carriers could be suggested as promising carriers for dermal deliveryof tacrolimus, which should be confirmed by appropriate clinical evaluation.",
publisher = "Универзитет у Београду, Фармацеутски факултет",
journal = "Универзитет у Београду",
title = "Dermalna isporuka takrolimusa - uporedna formulaciona i preklinička istraživanja mikroemulzija, nanoemulzija i nanostrukturiranih lipidnih čestica kao naprednih nosača za slabo rastvorne lekovite supstance",
url = "https://hdl.handle.net/21.15107/rcub_nardus_18775"
}
Savić, V.. (2021). Dermalna isporuka takrolimusa - uporedna formulaciona i preklinička istraživanja mikroemulzija, nanoemulzija i nanostrukturiranih lipidnih čestica kao naprednih nosača za slabo rastvorne lekovite supstance. in Универзитет у Београду
Универзитет у Београду, Фармацеутски факултет..
https://hdl.handle.net/21.15107/rcub_nardus_18775
Savić V. Dermalna isporuka takrolimusa - uporedna formulaciona i preklinička istraživanja mikroemulzija, nanoemulzija i nanostrukturiranih lipidnih čestica kao naprednih nosača za slabo rastvorne lekovite supstance. in Универзитет у Београду. 2021;.
https://hdl.handle.net/21.15107/rcub_nardus_18775 .
Savić, Vedrana, "Dermalna isporuka takrolimusa - uporedna formulaciona i preklinička istraživanja mikroemulzija, nanoemulzija i nanostrukturiranih lipidnih čestica kao naprednih nosača za slabo rastvorne lekovite supstance" in Универзитет у Београду (2021),
https://hdl.handle.net/21.15107/rcub_nardus_18775 .

Tacrolimus-loaded lecithin-based nanostructured lipid carrier and nanoemulsion with propylene glycol monocaprylate as a liquid lipid: Formulation characterization and assessment of dermal delivery compared to referent ointment

Savić, Vedrana; Ilić, Tanja; Nikolić, Ines; Marković, Bojan; Čalija, Bojan; Cekić, Nebojša; Savić, Snežana

(2019)

TY  - JOUR
AU  - Savić, Vedrana
AU  - Ilić, Tanja
AU  - Nikolić, Ines
AU  - Marković, Bojan
AU  - Čalija, Bojan
AU  - Cekić, Nebojša
AU  - Savić, Snežana
PY  - 2019
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/3454
AB  - Nanostructured lipid carriers (NLC) and nanoemulsions (NE) are colloid carriers which could improve dermal delivery of tacrolimus. The aims of this study were to evaluate effects of different formulation and process parameters on physicochemical characteristics and stability of lecithin-based NLC with glyceryl palmitostearate as solid and propylene glycol monocaprylate as liquid lipid and to compare the influence of different inner structure of tacrolimus-loaded NLC and corresponding NE on physicochemical characteristics, stability, entrapment efficiency, in vitro drug release and overall skin performance. Solid/liquid lipid ratio, total amount of lipids, homogenization pressure and cooling after the preparation were identified as critical variables in NLC development. Moreover, tacrolimus-loaded NLC emerged as more stabile carrier than NE. Differential stripping performed on porcine ear skin revealed significantly higher tacrolimus amount in stratum corneum from nanocarriers compared to referent ointment (Protopic®). Similarly the highest amount of tacrolimus in hair follicles was obtained using NLC (268.54 ± 92.38 ng/cm2), followed by NE (128.17 ± 48.87 ng/cm2) and Protopic® (77.61 ± 43.25 ng/cm2). Contrary, the highest permeation rate through full-thickness porcine ear skin was observed for Protopic®, implying that the selection of experimental setup is critical for reliable skin performance assessment. Overall, developed NLC could be suggested as promising carrier in a form of lotion for tacrolimus dermal delivery.
T2  - International Journal of Pharmaceutics
T1  - Tacrolimus-loaded lecithin-based nanostructured lipid carrier and nanoemulsion with propylene glycol monocaprylate as a liquid lipid: Formulation characterization and assessment of dermal delivery compared to referent ointment
VL  - 569
SP  - 1
EP  - 11
DO  - 10.1016/j.ijpharm.2019.118624
ER  - 
@article{
author = "Savić, Vedrana and Ilić, Tanja and Nikolić, Ines and Marković, Bojan and Čalija, Bojan and Cekić, Nebojša and Savić, Snežana",
year = "2019",
abstract = "Nanostructured lipid carriers (NLC) and nanoemulsions (NE) are colloid carriers which could improve dermal delivery of tacrolimus. The aims of this study were to evaluate effects of different formulation and process parameters on physicochemical characteristics and stability of lecithin-based NLC with glyceryl palmitostearate as solid and propylene glycol monocaprylate as liquid lipid and to compare the influence of different inner structure of tacrolimus-loaded NLC and corresponding NE on physicochemical characteristics, stability, entrapment efficiency, in vitro drug release and overall skin performance. Solid/liquid lipid ratio, total amount of lipids, homogenization pressure and cooling after the preparation were identified as critical variables in NLC development. Moreover, tacrolimus-loaded NLC emerged as more stabile carrier than NE. Differential stripping performed on porcine ear skin revealed significantly higher tacrolimus amount in stratum corneum from nanocarriers compared to referent ointment (Protopic®). Similarly the highest amount of tacrolimus in hair follicles was obtained using NLC (268.54 ± 92.38 ng/cm2), followed by NE (128.17 ± 48.87 ng/cm2) and Protopic® (77.61 ± 43.25 ng/cm2). Contrary, the highest permeation rate through full-thickness porcine ear skin was observed for Protopic®, implying that the selection of experimental setup is critical for reliable skin performance assessment. Overall, developed NLC could be suggested as promising carrier in a form of lotion for tacrolimus dermal delivery.",
journal = "International Journal of Pharmaceutics",
title = "Tacrolimus-loaded lecithin-based nanostructured lipid carrier and nanoemulsion with propylene glycol monocaprylate as a liquid lipid: Formulation characterization and assessment of dermal delivery compared to referent ointment",
volume = "569",
pages = "1-11",
doi = "10.1016/j.ijpharm.2019.118624"
}
Savić, V., Ilić, T., Nikolić, I., Marković, B., Čalija, B., Cekić, N.,& Savić, S.. (2019). Tacrolimus-loaded lecithin-based nanostructured lipid carrier and nanoemulsion with propylene glycol monocaprylate as a liquid lipid: Formulation characterization and assessment of dermal delivery compared to referent ointment. in International Journal of Pharmaceutics, 569, 1-11.
https://doi.org/10.1016/j.ijpharm.2019.118624
Savić V, Ilić T, Nikolić I, Marković B, Čalija B, Cekić N, Savić S. Tacrolimus-loaded lecithin-based nanostructured lipid carrier and nanoemulsion with propylene glycol monocaprylate as a liquid lipid: Formulation characterization and assessment of dermal delivery compared to referent ointment. in International Journal of Pharmaceutics. 2019;569:1-11.
doi:10.1016/j.ijpharm.2019.118624 .
Savić, Vedrana, Ilić, Tanja, Nikolić, Ines, Marković, Bojan, Čalija, Bojan, Cekić, Nebojša, Savić, Snežana, "Tacrolimus-loaded lecithin-based nanostructured lipid carrier and nanoemulsion with propylene glycol monocaprylate as a liquid lipid: Formulation characterization and assessment of dermal delivery compared to referent ointment" in International Journal of Pharmaceutics, 569 (2019):1-11,
https://doi.org/10.1016/j.ijpharm.2019.118624 . .
29
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Tacrolimus loaded biocompatible lecithin-based microemulsions with improved skin penetration: Structure characterization and in vitro/in vivo performances

Savić, Vedrana; Todosijević, Marija N.; Ilić, Tanja; Lukić, Milica; Mitsou, Evgenia; Papadimitriou, Vassiliki; Avramiotis, Spyridon; Marković, Bojan; Cekić, Nebojša; Savić, Snežana

(Elsevier Science BV, Amsterdam, 2017)

TY  - JOUR
AU  - Savić, Vedrana
AU  - Todosijević, Marija N.
AU  - Ilić, Tanja
AU  - Lukić, Milica
AU  - Mitsou, Evgenia
AU  - Papadimitriou, Vassiliki
AU  - Avramiotis, Spyridon
AU  - Marković, Bojan
AU  - Cekić, Nebojša
AU  - Savić, Snežana
PY  - 2017
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/2823
AB  - In order to improve skin penetration of tacrolimus we aimed to develop potentially non-irritant, lecithin-based microemulsions containing ethanol, isopropanol and/or propylene glycol as cosurfactants, varying caprylic/capric triglycerides and propylene glycol monocaprylate as oil phase. The influence of excipients on the size of microemulsion region in pseudo-ternary phase diagrams and their ability to form different types of microemulsions was evaluated. The comprehensive physicochemical characterization of microemulsions and the evaluation of their structure was performed, while the localization of tacrolimus in microemulsions was further investigated using electron paramagnetic resonance spectroscopy. Moreover, stability studies proved no change in tacrolimus content during one year of storage at room temperature. In addition, in vivo skin performance indicated no skin irritation potential of blank microemulsions, whereas in vitro release testing using Franz diffusion cells showed superior release rate of tacrolimus from microemulsions (0.98 +/- 0.10 and 0.92 +/- 0.11 mu g/cm(2)/h for two bicontinuous and 1.00 +/- 0.24 mu g/cm(2)/h for oil-in-water microemulsion) compared to referent Protopic ointment (0.15 +/- 0.08 mu g/cm(2)/h). Furthermore, ex vivo penetration assessed through porcine ear skin using tape stripping, confirmed superiority of two microemulsions related to the reference, implying developed microemulsions as promising carriers for dermal delivery of tacrolimus.
PB  - Elsevier Science BV, Amsterdam
T2  - International Journal of Pharmaceutics
T1  - Tacrolimus loaded biocompatible lecithin-based microemulsions with improved skin penetration: Structure characterization and in vitro/in vivo performances
VL  - 529
IS  - 1-2
SP  - 491
EP  - 505
DO  - 10.1016/j.ijpharm.2017.07.036
ER  - 
@article{
author = "Savić, Vedrana and Todosijević, Marija N. and Ilić, Tanja and Lukić, Milica and Mitsou, Evgenia and Papadimitriou, Vassiliki and Avramiotis, Spyridon and Marković, Bojan and Cekić, Nebojša and Savić, Snežana",
year = "2017",
abstract = "In order to improve skin penetration of tacrolimus we aimed to develop potentially non-irritant, lecithin-based microemulsions containing ethanol, isopropanol and/or propylene glycol as cosurfactants, varying caprylic/capric triglycerides and propylene glycol monocaprylate as oil phase. The influence of excipients on the size of microemulsion region in pseudo-ternary phase diagrams and their ability to form different types of microemulsions was evaluated. The comprehensive physicochemical characterization of microemulsions and the evaluation of their structure was performed, while the localization of tacrolimus in microemulsions was further investigated using electron paramagnetic resonance spectroscopy. Moreover, stability studies proved no change in tacrolimus content during one year of storage at room temperature. In addition, in vivo skin performance indicated no skin irritation potential of blank microemulsions, whereas in vitro release testing using Franz diffusion cells showed superior release rate of tacrolimus from microemulsions (0.98 +/- 0.10 and 0.92 +/- 0.11 mu g/cm(2)/h for two bicontinuous and 1.00 +/- 0.24 mu g/cm(2)/h for oil-in-water microemulsion) compared to referent Protopic ointment (0.15 +/- 0.08 mu g/cm(2)/h). Furthermore, ex vivo penetration assessed through porcine ear skin using tape stripping, confirmed superiority of two microemulsions related to the reference, implying developed microemulsions as promising carriers for dermal delivery of tacrolimus.",
publisher = "Elsevier Science BV, Amsterdam",
journal = "International Journal of Pharmaceutics",
title = "Tacrolimus loaded biocompatible lecithin-based microemulsions with improved skin penetration: Structure characterization and in vitro/in vivo performances",
volume = "529",
number = "1-2",
pages = "491-505",
doi = "10.1016/j.ijpharm.2017.07.036"
}
Savić, V., Todosijević, M. N., Ilić, T., Lukić, M., Mitsou, E., Papadimitriou, V., Avramiotis, S., Marković, B., Cekić, N.,& Savić, S.. (2017). Tacrolimus loaded biocompatible lecithin-based microemulsions with improved skin penetration: Structure characterization and in vitro/in vivo performances. in International Journal of Pharmaceutics
Elsevier Science BV, Amsterdam., 529(1-2), 491-505.
https://doi.org/10.1016/j.ijpharm.2017.07.036
Savić V, Todosijević MN, Ilić T, Lukić M, Mitsou E, Papadimitriou V, Avramiotis S, Marković B, Cekić N, Savić S. Tacrolimus loaded biocompatible lecithin-based microemulsions with improved skin penetration: Structure characterization and in vitro/in vivo performances. in International Journal of Pharmaceutics. 2017;529(1-2):491-505.
doi:10.1016/j.ijpharm.2017.07.036 .
Savić, Vedrana, Todosijević, Marija N., Ilić, Tanja, Lukić, Milica, Mitsou, Evgenia, Papadimitriou, Vassiliki, Avramiotis, Spyridon, Marković, Bojan, Cekić, Nebojša, Savić, Snežana, "Tacrolimus loaded biocompatible lecithin-based microemulsions with improved skin penetration: Structure characterization and in vitro/in vivo performances" in International Journal of Pharmaceutics, 529, no. 1-2 (2017):491-505,
https://doi.org/10.1016/j.ijpharm.2017.07.036 . .
43
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Inter-laboratory verification of European pharmacopoeia monograph on derivative spectrophotometry method and its application for chitosan hydrochloride

Marković, Bojan; Ignjatović, Janko; Vujadinović, Mirjana; Savić, Vedrana; Vladimirov, Sote; Karljiković-Rajić, Katarina

(Pergamon-Elsevier Science Ltd, Oxford, 2015)

TY  - JOUR
AU  - Marković, Bojan
AU  - Ignjatović, Janko
AU  - Vujadinović, Mirjana
AU  - Savić, Vedrana
AU  - Vladimirov, Sote
AU  - Karljiković-Rajić, Katarina
PY  - 2015
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/2323
AB  - Inter-laboratory verification of European pharmacopoeia (EP) monograph on derivative spectrophotometry (DS) method and its application for chitosan hydrochloride was carried out on two generation of instruments (earlier GBC Cintra 20 and current technology TS Evolution 300). Instruments operate with different versions of Savitzky-Golay algorithm and modes of generating digital derivative spectra. For resolution power parameter, defined as the amplitude ratio A/B in DS method EP monograph, comparable results were obtained only with algorithm's parameters smoothing points (SP) 7 and the 2nd degree polynomial and those provided corresponding data with other two modes on TS Evolution 300 Medium digital indirect and Medium digital direct. Using quoted algorithm's parameters, the differences in percentages between the amplitude ratio A/B averages, were within accepted criteria (+/- 13%) for assay of drug product for method transfer. The deviation of 1.76% for the degree of deacetylation assessment of chitosan hydrochloride, determined on two instruments, (amplitude D-1(202); the 2nd degree polynomial and SP 9 in Savitzky-Golay algorithm), was acceptable, since it was within allowed criteria (+/- 2%) for assay deviation of drug substance, for method transfer in pharmaceutical analyses.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Spectroscopy Letters
T1  - Inter-laboratory verification of European pharmacopoeia monograph on derivative spectrophotometry method and its application for chitosan hydrochloride
VL  - 150
SP  - 792
EP  - 798
DO  - 10.1016/j.saa.2015.06.022
ER  - 
@article{
author = "Marković, Bojan and Ignjatović, Janko and Vujadinović, Mirjana and Savić, Vedrana and Vladimirov, Sote and Karljiković-Rajić, Katarina",
year = "2015",
abstract = "Inter-laboratory verification of European pharmacopoeia (EP) monograph on derivative spectrophotometry (DS) method and its application for chitosan hydrochloride was carried out on two generation of instruments (earlier GBC Cintra 20 and current technology TS Evolution 300). Instruments operate with different versions of Savitzky-Golay algorithm and modes of generating digital derivative spectra. For resolution power parameter, defined as the amplitude ratio A/B in DS method EP monograph, comparable results were obtained only with algorithm's parameters smoothing points (SP) 7 and the 2nd degree polynomial and those provided corresponding data with other two modes on TS Evolution 300 Medium digital indirect and Medium digital direct. Using quoted algorithm's parameters, the differences in percentages between the amplitude ratio A/B averages, were within accepted criteria (+/- 13%) for assay of drug product for method transfer. The deviation of 1.76% for the degree of deacetylation assessment of chitosan hydrochloride, determined on two instruments, (amplitude D-1(202); the 2nd degree polynomial and SP 9 in Savitzky-Golay algorithm), was acceptable, since it was within allowed criteria (+/- 2%) for assay deviation of drug substance, for method transfer in pharmaceutical analyses.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Spectroscopy Letters",
title = "Inter-laboratory verification of European pharmacopoeia monograph on derivative spectrophotometry method and its application for chitosan hydrochloride",
volume = "150",
pages = "792-798",
doi = "10.1016/j.saa.2015.06.022"
}
Marković, B., Ignjatović, J., Vujadinović, M., Savić, V., Vladimirov, S.,& Karljiković-Rajić, K.. (2015). Inter-laboratory verification of European pharmacopoeia monograph on derivative spectrophotometry method and its application for chitosan hydrochloride. in Spectroscopy Letters
Pergamon-Elsevier Science Ltd, Oxford., 150, 792-798.
https://doi.org/10.1016/j.saa.2015.06.022
Marković B, Ignjatović J, Vujadinović M, Savić V, Vladimirov S, Karljiković-Rajić K. Inter-laboratory verification of European pharmacopoeia monograph on derivative spectrophotometry method and its application for chitosan hydrochloride. in Spectroscopy Letters. 2015;150:792-798.
doi:10.1016/j.saa.2015.06.022 .
Marković, Bojan, Ignjatović, Janko, Vujadinović, Mirjana, Savić, Vedrana, Vladimirov, Sote, Karljiković-Rajić, Katarina, "Inter-laboratory verification of European pharmacopoeia monograph on derivative spectrophotometry method and its application for chitosan hydrochloride" in Spectroscopy Letters, 150 (2015):792-798,
https://doi.org/10.1016/j.saa.2015.06.022 . .
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