Log in to search using one of your social media accounts:

 

Shear strength of pharmaceutical tablets: Theoretical considerations, evaluation and relation with the capping tendency of biconvex tablets

Publication date: 30 October 2017 Source:International Journal of Pharmaceutics, Volume 532, Issue 1 Author(s): V. Mazel, H. Diarra, V. Busignies, P. Tchoreloff Capping is a major industrial issue during pharmaceutical powder compression, especially in the case of biconvex tablets. Several articles proposed that capping was in fact a failure in shear. Shear strength should thus be interesting to study the capping tendency of a formulation. In this work, the ratio between the shear strength and the tensile strength obtained by diametral compression was first studied from a theoretical point of view considering different failure criteria. Then, a shear test usually performed on bilayer tablets was adapted to monolayer tablets. The shear strength obtained for 5 products, 2 of them having a known capping tendency, were compared with the strengths obtained during diametral compression test and uniaxial compression test. The results indicated that, for the formulations with a capping tendency, the ratio between the shear strength and diametral compression strength was lower than for the other products. Considering the mechanism of capping, the weakness in shear of these formulations explained their capping tendency. This was also linked with the mechanical anisotropy of the same formulations which was shown in the literature. In the cases studied in this article, the fundamental reason for the capping tendency was the anisotropic strength of the tablets. Graphical abstract
Source: International Journal of Pharmaceutics - Category: Drugs & Pharmacology Source Type: research

Related Links:

Abstract ObjectivesTo evaluate how oral and general health‐risk behaviours cluster among Brazilian adolescents. MethodsThe study comprised a total of 109 104 adolescents (52.2% female) participating in the Brazilian National School‐based Student Health Survey (PeNSE). Seventeen behaviours (including diet; oral and hand hygiene; frequency of dental visits; tobacco, alcohol and drug use; sexual behaviour; physical activity, and risk for external causes) were measured using a self‐reported questionnaire. Pairwise correlations between the health‐risk behaviours were performed, and clustering was assessed by the hierarc...
Source: Community Dentistry and Oral Epidemiology - Category: Dentistry Authors: Tags: ORIGINAL ARTICLE Source Type: research
Authors: PMID: 29166204 [PubMed - in process]
Source: Brain Injury - Category: Neurology Tags: Brain Inj Source Type: research
Authors: Yue JK, Winkler EA, Sharma S, Vassar MJ, Ratcliff JJ, Korley FK, Seabury SA, Ferguson AR, Lingsma HF, Meeuws S, Adeoye OM, Rick JW, Robinson CK, Duarte SM, Yuh EL, Mukherjee P, Dikmen SS, McAllister TW, Diaz-Arrastia R, Valadka AB, Gordon WA, Okonkwo DO, Manley GT, , Hansen Deng Predictors of mTBI admission, referral and outcome, , and the TRACK-TBI Investigators Abstract OBJECTIVE: To investigate the clinical management and medical follow-up of patients with mild traumatic brain injury (mTBI) presenting to emergency departments (EDs). METHODS: Overall, 168 adult patients with mTBI from the prospective...
Source: Brain Injury - Category: Neurology Tags: Brain Inj Source Type: research
CONCLUSIONS: Accordingly, we demonstrate the potential of mammalian hair follicles serving as an additional source for biomarker discovery and for diagnosing mTBI with high accessibility. PMID: 29157017 [PubMed - as supplied by publisher]
Source: Brain Injury - Category: Neurology Tags: Brain Inj Source Type: research
Authors: Mercier E, Tardif PA, Cameron PA, Émond M, Moore L, Mitra B, Ouellet MC, Frenette J, de Guise E, Le Sage N Abstract BACKGROUND: This systematic review aimed to determine the prognostic value of neuron-specific enolase (NSE) to predict post-concussion symptoms following mild traumatic brain injury (TBI). METHODS: Seven databases were searched for studies evaluating the association between NSE levels and post-concussion symptoms assessed ≥ 3 months (persistent) or ≥ 7 days
Source: Brain Injury - Category: Neurology Tags: Brain Inj Source Type: research
CONCLUSION: Pre-injury psychosocial and demographic factors may be more important than injury severity for predicting some long-term functional outcomes post-TBI. It would likely be beneficial to assess these factors in the inpatient setting, with input from a multidisciplinary team, as an early understanding of prognostic indicators can help guide treatment for optimal functional outcomes. PMID: 29157000 [PubMed - as supplied by publisher]
Source: Brain Injury - Category: Neurology Tags: Brain Inj Source Type: research
Authors: Ibañez Pérez De La Blanca MA, Fernández Mondéjar E, Gómez Jimènez FJ, Alonso Morales JM, Lombardo MDQ, Viso Rodriguez JL Abstract PRIMARY OBJECTIVE: To identify risk factors for intracerebral lesion (ICL) in older adults with mild traumatic brain injury (MTBI) and evaluate the influence of comorbidities on outcomes. RESEARCH DESIGN: Prospective cohort study. METHODS AND PROCEDURES: Information was gathered on clinical history/examination, cranial computed tomography, admission Glasgow Coma Scale (GCS) score, analytical and coagulation findings, and mortalit...
Source: Brain Injury - Category: Neurology Tags: Brain Inj Source Type: research
CONCLUSIONS: rmTBI produces acute cognitive and anxiety-like disturbances associated with inflammatory changes in brain regions involved in spatial memory and anxiety. PMID: 29156991 [PubMed - as supplied by publisher]
Source: Brain Injury - Category: Neurology Tags: Brain Inj Source Type: research
CONCLUSION: Young patients reported psychological problems in several areas during the chronic phase of injury, which may hinder complete reintegration and participation in society. Larger functional improvement during sub-acute rehabilitation seemed to be associated with less psychological problems in the chronic phase. PMID: 29156990 [PubMed - as supplied by publisher]
Source: Brain Injury - Category: Neurology Tags: Brain Inj Source Type: research
Authors: Faugeras F, Rohaut B, Valente M, Sitt J, Demeret S, Bolgert F, Weiss N, Grinea A, Marois C, Quirins M, Demertzi A, Raimondo F, Galanaud D, Habert MO, Engemann D, Puybasset L, Naccache L Abstract BACKGROUND: The prognosis value of early clinical diagnosis of consciousness impairment is documented by an extremely limited number of studies, whereas it may convey important information to guide medical decisions. OBJECTIVE: We aimed at determining if patients diagnosed at an early stage (
Source: Brain Injury - Category: Neurology Tags: Brain Inj Source Type: research
More News: Drugs & Pharmacology | Study