A package of established analytical tools to investigate the solid-state alteration of lipid-based excipients was written by Salar-Behzadi, Sharareh;Corzo, Carolina;Laggner, Peter. And the article was included in Journal of Visualized Experiments in 2022.Safety of Glyceryl monostearate The following contents are mentioned in the article:
Lipid-based excipients (LBEs) are low-toxic, biocompatible, and natural-based, and their application supports the sustainability of pharmaceutical manufacturing However, the major challenge is their unstable solid-state, affecting the stability of the pharmaceutical product. Critical phys. properties of lipids for their processing-such as melt temperature and viscosity, rheol., etc.-are related to their mol. structure and their crystallinity. Additives, as well as thermal and mech. stress involved in the manufacturing process, affect the solid-state of lipids and thus the performance of pharmaceutical products thereof. Therefore, understanding the alteration in the solid-state is crucial. In this work, the combination of powder x-ray diffraction and differential scanning calorimetry (DSC) is introduced as the gold standard for the characterization of lipids’ solid state. X-ray diffraction is the most efficient method to screen polymorphism and crystal growth. The polymorphic arrangement and the lamella length are characterized in the wide- and small-angle regions of x-ray diffraction, resp. The small-angle x-ray scattering (SAXS) region can be further used to investigate crystal growth. Phase transition and separation can be indicated. DSC is used to screen the thermal behavior of lipids, estimate the miscibility of additives and/or active pharmaceutical ingredients (API) in the lipid matrix, and provide phase diagrams. Four case studies are presented in which LBEs are either used as a coating material or as an encapsulation matrix to provide lipid-coated multiparticulate systems and lipid nanosuspensions, resp. The lipid solid-state and its potential alteration during storage are investigated and correlated to the alteration in the API release. Qual. microscopical methods such as polarized light microscopy and SEM are complementary tools to investigate micro-level crystallization Further anal. methods should be added based on the selected manufacturing process. The structure-function-processability relationship should be understood carefully to design robust and stable lipid-based pharmaceutical products. This study involved multiple reactions and reactants, such as Glyceryl monostearate (cas: 31566-31-1Safety of Glyceryl monostearate).
Glyceryl monostearate (cas: 31566-31-1) belongs to esters. Esters are also usually derived from carboxylic acids. It may also be obtained by reaction of acid anhydride or acid halides with alcohols or by the reaction of salts of carboxylic acids with alkyl halides. Many esters have the potential for conformational isomerism, but they tend to adopt an s-cis (or Z) conformation rather than the s-trans (or E) alternative, due to a combination of hyperconjugation and dipole minimization effects. The preference for the Z conformation is influenced by the nature of the substituents and solvent, if present. Lactones with small rings are restricted to the s-trans (i.e. E) conformation due to their cyclic structure.Safety of Glyceryl monostearate
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics