Response Surface Methodological Approach toward Optimization of a RP-HPLC Method to Determine Paracetamol in Tablets

Response surface methodology (RSM) was applied to develop an RP-HPLC method in which paracetamol was analyzed and determined on a C18 column with UV detection. To explain more, RSM was used to statistically model the impact of flow rate (ml.min-1) (A), column temperature (°C) (B) and mobile phase composition (H2O: MeOH) (C)on the retention time (RT) of Paracetamol within tablets. Introduction: The major goal of this investigation was to optimize an RP-HPLC method which is simple, linear, accurate, sensitive and selective in determination of Paracetamol in solid dosage forms. Methods and Results:Three distinctive levels were dedicated to each evaluated factor.Box-Behnken experimental design including seventeen independent runs within a range of 25-50% MeOH ratio (mobile phase), 25-45 ºC and 0.7-1.3 mL. min-1 flow rate were carried out to explore the effectivefactors onRT of Paracetamol using RP-HPLC method. ANOVA results revealed that quadratic model was significant (Model F-value of 225.65) and could best describe the relationship between dependent variable (RT) and independent ones: RT= 3.30 - 1.2A - 0.38B - 0.80C + 0.30AC + 0.43BC + 0.53A2 As can be understood from the model terms, the most significant term was the solvent ratio and all the factor levels were indirectly proportional to the Rt. Moreover, the interaction of column temperature and solvent ration seemed to be more important. It was also predicted that optimum assay condition included 1:2 ratio of methanol to water, column temperature of 35ºC and mobile phase flow rate of 1.3 mL.min−1. Using this optimum condition, baseline separation of the drug was achieved with a good resolution and a run time of 2.1 min. The optimized method was validated in terms of linearity, accuracy, limit of detection and limit of quantification of paracetamol within a few commercially available Paracetamol tablets. Conclusions:The optimized RP-HPLC technique provided a convenient and efficient method toward qualitative/quantitative analysis of Paracetamol in its tablets. The improved method is also rapid and sensitive enough to be used for single tablet analysis

More Than Smell—COVID-19 Is Associated With Severe Impairment of Smell, Taste, and Chemesthesis

Correction: Chemical Senses, Volume 46, 2021, bjab050, https://doi.org/10.1093/chemse/bjab050 Published: 08 December 2021Recent anecdotal and scientific reports have provided evidence of a link between COVID-19 and chemosensory impairments, such as anosmia. However, these reports have downplayed or failed to distinguish potential effects on taste, ignored chemesthesis, and generally lacked quantitative measurements. Here, we report the development, implementation, and initial results of a multilingual, international questionnaire to assess self-reported quantity and quality of perception in 3 distinct chemosensory modalities (smell, taste, and chemesthesis) before and during COVID-19. In the first 11 days after questionnaire launch, 4039 participants (2913 women, 1118 men, and 8 others, aged 19-79) reported a COVID-19 diagnosis either via laboratory tests or clinical assessment. Importantly, smell, taste, and chemesthetic function were each significantly reduced compared to their status before the disease. Difference scores (maximum possible change +/- 100) revealed a mean reduction of smell (-79.7 +/- 28.7, mean +/- standard deviation), taste (-69.0 +/- 32.6), and chemesthetic (-37.3 +/- 36.2) function during COVID-19. Qualitative changes in olfactory ability (parosmia and phantosmia) were relatively rare and correlated with smell loss. Importantly, perceived nasal obstruction did not account for smell loss. Furthermore, chemosensory impairments were similar between participants in the laboratory test and clinical assessment groups. These results show that COVID-19-associated chemosensory impairment is not limited to smell but also affects taste and chemesthesis.The multimodal impact of COVID-19 and the lack of perceived nasal obstruction suggest that severe acute respiratory syndrome coronavirus strain 2 (SARS-CoV-2) infection may disrupt sensory-neural mechanisms.Peer reviewe

Farsça diyalog çevresinde renk ve gaze etkisinin yönlendiren ifadeler kullanımında ikili göz izleme yöntemi ile incelenmesi

The aim of this study is to explore the structure of Farsi referring expressions (RE) used during a collaborative Tangram puzzle solving activity, and investigate the role of different visual cue conditions on the types of RE and the degree of gaze coordination. A jigsaw task design was used which required participants to work as a team to solve Tangram puzzles in three conditions where (a) all pieces had the same color (normal condition), (b) all pieces were assigned a distinct color (color condition), and (c) all pieces had the same color but the partner’s gaze information was visualized on the screen (gaze cueing condition). In this respect, two main aspects were under scrutiny: linguistic and dual eye-tacking analysis, while both are assumed to be enriched recourses for modulating joint attention. For this purpose, a corpus of Farsi REs in a situated dialogue environment is constructed to evaluate the frequency of specific RE’s features and their length distribution. Descriptive statistics show that Mosallas (Triangle), Un (That) are the most frequently used RE words in the Farsi corpus. The RE feature distributions are compared with Turkish, Japanese and English RE corpora compiled with the same task to provide a cross-linguistic analysis. Conversational analysis of features of REs revealed the prominent role of color terms in identifying objects and the striking influence of shape and size in gaze cueing condition. Besides, cross-linguistic analysis results demonstrate that Farsi is distant to all languages in this respect. In case of dual eye-tracking analysis, results were not influenced significantly under different status and also along six trials. However, there was a significant interaction effect between conditions and trials especially for the color case.M.S. - Master of Scienc

Corrigendum to: More than smell. COVID-19 is associated with severe impairment of smell, taste, and chemesthesis

International audienc

Corrigendum to::More Than Smell-COVID-19 Is Associated with Severe Impairment of Smell, Taste, and Chemesthesis (Chemical Senses (2020) DOI: 10.1093/chemse/bjaa041)

This is a correction notice for article bjaa041 (DOI: https:// doi.org/10.1093/chemse/bjaa041), published 20 June 2020. An incorrect version of the caption to Figure 5 was mistakenly included in the published paper. An updated version is given below. Neither the data nor the paper's conclusions were affected by this correction. The authors sincerely apologize for the error. (A) Correlations between the 3 principal components with respect to changes in 3 chemosensory modalities (i.e., taste, smell, and chemesthesis). Shades of gray indicate positive correlation, whereas shades of red indicate negative correlations. White denotes no correlation. (B) Clusters of participants identified by k-means clustering. The scatterplot shows each participant's loading on dimension 1 (degree of smell and taste loss, PC1 on x-Axis) and dimension 2 (degree of chemesthesis loss, PC2 on y-Axis). Based on the centroid of each cluster, participants in cluster 1 (blue, N = 1767; top left) are generally characterized by significant smell, taste and chemesthesis loss. Participants in cluster 2 (orange, N = 1724; bottom center) are generally characterized by ratings that reflect smell/taste loss with preserved chemesthesis. Loadings for participants in cluster 3 (green, N = 548; right side) are generally characterized by reduced smell and taste loss, and preserved chemesthesis