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"abstractNote": "Ivermectin (IVM) drug substance is a semi-synthetic macrocyclic lactone that exhibits a broad spectrum of activity and high potency towards endo- and ectoparasites. In this study, a comprehensive forced degradation study was carried out on IVM drug substance (under the conditions recommended in the ICH guidelines) to identify and characterize its major degradation products (DPs). IVM drug substance was subjected to acidic, alkaline, oxidation (H2O2 and K2Cr2O7), thermal (solid and solution state), and photolytic (solid and solution state) stress degradations. Chromatographic separation of the drug substance and its DPs was achieved using a gradient elution on a HALO C18 column (150 × 4.6 mm, 2.7 µm). A total of five major DPs were observed for IVM drug substance under various stressed conditions. Additionally, ivermectin API lots exhibited instability when stored under room temperature and at 45% relative humidity for two years. These DPs were identified and characterized using liquid chromatography-high resolution mass spectrometry (LC-HRMS) and a comparison of their fragmentation profile with IVM H2B1a using tandem mass spectrometry. Of these, H2O2 induced oxidative degradation product (3,4-epoxide H2B1a) was isolated using semi-preparative HPLC and its structure was elucidated comprehensively using LC-HRMS and nuclear magnetic resonance spectroscopy. The proposed structures of the DPs have been rationalized by appropriate degradation pathways of IVM H2B1a. Comprehensive degradation profile of IVM drug substance should facilitate the understanding of the stability profile of IVM drug substance, setting the specification of DPs in finished products as well as aid in the design of generic formulation made with IVM.",
"publicationTitle": "Journal of Pharmaceutical and Biomedical Analysis",
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"abstractNote": "The identification and characterization of four process impurities in bulk ivermectin and four process impurities in bulk avermectin, using a combination of MS and NMR, are discussed herein. These process impurities were shown to be 24-demethyl H2B1a, 3′-demethyl H2B1a, 3″-demethyl H2B1a and 24a-hydroxy B2a isomer. The impurities were shown to be process impurities and are present in avermectin bulk also.",
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"abstractNote": "Mass drug administration of ivermectin has been proposed as a possible malaria elimination tool. Ivermectin exhibits a mosquito-lethal effect well beyond its biological half-life, suggesting the presence of active slowly eliminated metabolites. Human liver microsomes, primary human hepatocytes, and whole blood from healthy volunteers given oral ivermectin were used to identify ivermectin metabolites by ultra-high performance liquid chromatography coupled with high-resolution mass spectrometry. The molecular structures of metabolites were determined by mass spectrometry and verified by nuclear magnetic resonance. Pure cytochrome P450 enzyme isoforms were used to elucidate the metabolic pathways. Thirteen different metabolites (M1M13) were identified after incubation of ivermectin with human liver microsomes. Three (M1, M3, and M6) were the major metabolites found in microsomes, hepatocytes, and blood from volunteers after oral ivermectin administration. The chemical structure, defined by LC-MS/MS and NMR, indicated that M1 is 3″-O-demethyl ivermectin, M3 is 4-hydroxymethyl ivermectin, and M6 is 3″-O-demethyl, 4-hydroxymethyl ivermectin. Metabolic pathway evaluations with characterized cytochrome P450 enzymes showed that M1, M3, and M6 were produced primarily by CYP3A4, and that M1 was also produced to a small extent by CYP3A5. Demethylated (M1) and hydroxylated (M3) ivermectin were the main human in vivo metabolites. Further studies are needed to characterize the pharmacokinetic properties and mosquito-lethal activity of these metabolites.",
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"abstractNote": "Cannabidiolic acid (CBDA) is the main phytocannabinoid in fiber and seed-oil hemp (Cannabis sativa L.) plants, but its potential health-related capabilities have been masked for years by a greater scientific interest towards its neutral derivative cannabidiol (CBD). This review aims to collect from the literature and critically discuss all the information about this molecule, starting from its biosynthesis, and focusing on its bioactivity, as an anti-inflammatory, anti-emetic, anti-convulsant, and anti-cancerogenic drug. Furthermore, in the awareness that, despite its multiple bioactive effects, currently poor efforts have been made to achieve its reliable purification, herein, we propose a relatively simple, fast, and inexpensive procedure for its recovery from pollen of industrial hemp cultivars. Spectroscopic and spectrometric techniques allowed us to unequivocally identify pure isolated CBDA and to distinguish it from the constitutional isomer tetrahydrocannabinolic acid (THCA-A).",
"publicationTitle": "Molecules",
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"abstractNote": "A practicable and reliable quantitative proton nuclear magnetic resonance (1H qNMR) method was developed and evaluated for the qualitative and quantitative determination of cannabidiol (CBD), the principal and most important among cannabinoids in Cannabis sativa L. (hemp), and present in food products and animal feeding derived from the industrial processing of hemp seeds. Specificity, sensitivity, linearity range, precision, accuracy, LOD and LOQ of the method proved to be entirely satisfactory. This spectroscopic method uses the unlabelled residual solvent of CDCl3 as the “intrinsic” internal standard. The develop procedure might also be applied to measure levels of all the other lawful natural cannabinoids in commercial productions obtained from hemp seeds. Moreover, the rapid and relatively economical quantification of CBD could be of great importance, because it is possible to candidate this cannabinoid to the role of a molecular marker attesting food processing quality.",
"publicationTitle": "IOP Conference Series: Materials Science and Engineering",
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"abstractNote": "NMR-based metabolomics is an analytical platform, which has been used to classify and analyze Cannabis sativa L. cell suspension cultures and plants. Diverse groups of primary and secondary metabolites were identified by comparing NMR data with reference compounds and/or by structure elucidation using 1H-NMR, J-resolved, 1H-1H COSY, and 1H-13C HMBC spectroscopy. The direct extraction and the extraction by indirect fractionation are two suitable methods for the C. sativa sample preparation. Quantitative analyses could be performed without requiring fractionation or isolation procedures.",
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