Prevalence of impurity retention mechanisms in pharmaceutical crystallizations

FL Nordstrom, E Sirota, C Hartmanshenn… - … Process Research & …, 2023 - ACS Publications
The rejection of process impurities from crystallizing products is an essential step for the
purification of pharmaceutical drugs and for the isolation of active pharmaceutical …

[HTML][HTML] Thermodynamics of the enantiotropic pharmaceutical compound benzocaine and solubility in pure organic solvents

D Cheuk, M Svärd, ÅC Rasmuson - Journal of Pharmaceutical Sciences, 2020 - Elsevier
The thermodynamic relationship between FI and FII of ethyl 4-aminobenzoate (benzocaine)
has been investigated. Slurry conversion experiments show that the transition temperature …

A new high-pressure benzocaine polymorph—Towards understanding the molecular aggregation in crystals of an important active pharmaceutical ingredient (API)

E Patyk-Kaźmierczak… - … Section B: Structural …, 2020 - journals.iucr.org
Benzocaine (BZC), an efficient and highly permeable anaesthetic and an active
pharmaceutical ingredient of many commercially available drugs, was studied under high …

Quantitation of trace amorphous solifenacin succinate in pharmaceutical formulations by transmission Raman spectroscopy

H Terada, Y Hattori, T Sasaki, M Otsuka - International Journal of …, 2019 - Elsevier
It is important to quantify amorphous solid in active pharmaceutical ingredients (API) of
formulations to guarantee high-quality pharmaceutical products. In this study, we aimed to …

Effect of excipient properties, water activity, and water content on the disproportionation of a pharmaceutical salt

MA Patel, S Luthra, SL Shamblin, KK Arora… - International Journal of …, 2018 - Elsevier
Excipients are crucial components of most pharmaceutical formulations. In the case of a
solid oral dosage formulation containing the salt form of a weakly ionizable drug, excipient …

The Phase Diagram of the API Benzocaine and Its Highly Persistent, Metastable Crystalline Polymorphs

IB Rietveld, H Akiba, O Yamamuro, M Barrio, R Céolin… - Pharmaceutics, 2023 - mdpi.com
The availability of sufficient amounts of form I of benzocaine has led to the investigation of its
phase relationships with the other two existing forms, II and III, using adiabatic calorimetry …

Assessing the risk of salt disproportionation using crystal structure and surface topography analysis

MA Patel, S Luthra, SL Shamblin, KK Arora… - Crystal Growth & …, 2018 - ACS Publications
Salt disproportionation is a major issue for pharmaceutical products containing a salt form of
a weakly basic drug, because conversion to the free base during processing or storage in …

Synthesis, molecular and crystal structures of 4-amino-3, 5-difluorobenzonitrile, ethyl 4-amino-3, 5-difluorobenzoate, and diethyl 4, 4′-(diazene-1, 2-diyl) bis (3, 5 …

EM Novikov, J Guillen Campos, J Read de Alaniz… - Structure …, 2024 - journals.iucr.org
The crystal structures of two intermediates, 4-amino-3, 5-difluorobenzonitrile, C7H4F2N2 (I),
and ethyl 4-amino-3, 5-difluorobenzoate, C9H9F2NO2 (II), along with a visible-light …

Aripiprazole and Dehydro-Aripiprazole Solid Solutions: Crystalline Combinations of Drug and Active Metabolite in Tailored Compositions

JT Trotta, TA Zeidan, PA Tilak, BM Foxman… - Crystal Growth & …, 2020 - ACS Publications
Solid solutions of aripiprazole (APZ) and its active metabolite, dehydro-aripiprazole (dAPZ),
have been prepared as free form (neat or nonsolvated), hydrated, or alcohol-solvated …

[PDF][PDF] The Phase Diagram of the API Benzocaine and Its Highly Persistent, Metastable Crystalline Polymorphs. Pharmaceutics 2023, 15, 1549

IB Rietveld, H Akiba, O Yamamuro, M Barrio, R Céolin… - 2023 - core.ac.uk
The availability of sufficient amounts of form I of benzocaine has led to the investigation of its
phase relationships with the other two existing forms, II and III, using adiabatic calorimetry …