Quality of Emulsions Based on Modified Watermelon Seed Oil, Stabilized with Orange Fibres

The aim of the study was to evaluate emulsion systems prepared on the basis of blended fat in different ratios (watermelon seed oil and mutton tallow) stabilised by orange fibres and xanthan gum. Emulsions were subjected to stability testing by Turbiscan and were assessed in terms of mean droplet size, colour, viscosity, texture, skin hydration and sensory properties. The most stable systems were found to be the ones containing a predominance of mutton tallow in a fat phase. For these emulsions the lowest increase in mean particle size during storage was observed. The study also confirmed the synergistic effect of the thickeners used. The presented emulsions despite favourable physicochemical parameters, did not gain acceptance in sensory evaluation.

Replicates Number for Drug Stability Testing during Bioanalytical Method Validation—An Experimental and Retrospective Approach

Background: The stability of a drug or metabolites in biological matrices is an essential part of bioanalytical method validation, but the justification of its sample size (replicates number) is insufficient. The international guidelines differ in recommended sample size to study stability from no recommendation to at least three quality control samples. Testing of three samples may lead to results biased by a single outlier. We aimed to evaluate the optimal sample size for stability testing based on 90% confidence intervals. Methods: We conducted the experimental, retrospective (264 confidence intervals for the stability of nine drugs during regulatory bioanalytical method validation), and theoretical (mathematical) studies. We generated experimental stability data (40 confidence intervals) for two analytes—tramadol and its major metabolite (O-desmethyl-tramadol)—in two concentrations, two storage conditions, and in five sample sizes (n = 3, 4, 5, 6, or 8). Results: The 90% confidence intervals were wider for low than for high concentrations in 18 out of 20 cases. For n = 5 each stability test passed, and the width of the confidence intervals was below 20%. The results of the retrospective study and the theoretical analysis supported the experimental observations that five or six repetitions ensure that confidence intervals fall within 85–115% acceptance criteria. Conclusions: Five repetitions are optimal for the assessment of analyte stability. We hope to initiate discussion and stimulate further research on the sample size for stability testing.

Formulation of Gel Hand Sanitizer of Nagasari Leaf Extract (Mesua ferrea L.)

Nagasari (Mesua ferrea L.) is one of the biodiversity to be developed as an antiseptic preparation. These plants are known to contain flavonoid compounds, tannins, and terpenoids that act as antibacterial. Hand sanitizer gel preparations can increase the effectiveness of topically. The physical properties of a good gel depend on a gelling agent, one of which is HPMC. The purpose of this study was to determine the effect of variations in HPMC levels on physical properties and antibacterial activity. Gels were prepared with various HPMC levels of 1%, 2%, and 3%. The gel was tested for physical properties and stability. All formulas produced preparations that met the requirements for good physical properties and stability. Testing of antibacterial activity against Staphylococcus aureus showed that an increase in HPMC levels could decrease the ability to release the active substance of the preparation. The diameter of the inhibition zone obtained was 10.0 mm (HPMC 1%); 9.5 mm (2% HPMC) and 8.0 mm (3% HPMC). Increasing the concentration of HPMC will increase the viscosity and adhesion but decrease the spreadability. The three formulas had antibacterial activity against Staphylococcus aureus with moderate criteria.Keywords: Extract of nagasari leaf, Gel, HPMC, Staphylococcus aureus

Stability Testing of Pharmaceutical Products

Stability studies must be carried out according to the guidelines provided by the International Conference of Harmonization, World Health Organization, and other agencies in a scheduled manner. The pharmaceutical product’s stability can be defined as the ability, within its physical, chemical, microbiological, toxicology, protective, and informational requirements of a particular formulation in a specific container-closure system. It also guarantees that the performance, safety, and efficacy are maintained throughout the shelf life of any pharmaceutical product which is considered as pre-requisite for acceptance and approval. Different stability test methods have originated with the need for constant monitoring of drugs and products for their quality and purity. In this review, we have included the types of stability of drugs substances, the relevance of different methods used to test the stability of the pharmaceutical product, guidelines issued to test the stability of pharmaceuticals, stability testing protocols which describes the main components of a well-controlled and regulated stability test and other aspects of stability.

Design, Development and Evaluation of Anisomeles indica Herbal Cough Syrup

The objective of the present study was to design, development and evaluation antitussive herbal cough syrup because designing of oral herbal formulation is still a challenge in modern pharmaceutics and the syrup formulation presents many technical problems to the industrial pharmacist. Potential antitussive herbs were used for developing the herbal cough syrup. Decoction of plant Anisomeles indica, Leaves of Adhathoda vasika, stems of Glycyrrhiza glabra, fruits of Piper nigrum and plant of Mentha piperita was prepared. One part of decoction was mixed with five parts of simple syrup IP (1:5) to prepare formulation. The formulations were evaluated by morphological characters, physical parameters like PH, Specific gravity, viscosity etc. Herbal cough syrup was also subjected for the accelerated stability testing (AST) for the period of 72hours at accelerated temperature conditions. No marked changes were noticed in all the evaluated parameters during AST. The laboratory scale preparation of herbal Syrup may be used as a stable, liquid dosage form and the work done in stability testing may help in the progress of shelf-life determination studies. The presence study includes design, development and evaluation of Anisomeles indica herbal cough syrup first time.

Robust organic cages prepared using hydrazone condensation display sulfate/hydrogenphosphate selectivity in water

Two robust hexacationic cages incorporating either urea or isophthalamide motifs were synthesized via a short and high-yielding synthetic pathway using hydrazone condensation reactions in water for the cage forming step. Stability testing revealed that the cages are stable to a range of stimuli in water and in organic solvents. The urea containing cage can bind anions in pure water, and displays strong and selective binding of SO42– over HPO42–. The isophthalamide containing cage binds SO42– only weakly in 1:1 D2O:d6-DMSO but displays strong and cooperative binding of two HPO42– anions. Combined quantum mechanical/annealed molecular dynamics simulations suggest that the remarkable differences in anion selectivity are largely a result of the differing flexibilities of the two cages.

Detection method for stability of microcontroller accessories based on biosensor

In order to solve the problem of poor accuracy of traditional microcontroller attachment stability testing method, a microcontroller attachment stability testing method based on biosensor was designed to solve the existing problems. The reliability test index of the microcontroller is established, then the interference of the microcontroller accessory is detected and responded, and the interference detection signal of the microcontroller accessory is selected. The process design of stability detection of microcontroller accessories based on biosensor is completed. The experimental results show that the stability detection method based on biosensor designed in this paper can ensure the stability detection accuracy of microcontroller accessories above 80%, which is more accurate than traditional methods. It can be used to evaluate the stability, reliability and performance of microcontroller accessories in long-term operation.

Capacitive Deionization for the Removal of Paraquat Herbicide from Aqueous Solution

In comparison to other conventional methods like adsorption and reverse osmosis (RO), capacitive deionization (CDI) has only been investigated extensively for the removal of inorganic pollutants from water, demonstrating limited practicality. Herein, the study investigated the use of CDI for the removal of paraquat (PQ) herbicide from water by using commercial activated carbon (AC) electrodes. The CDI performance was examined as a function of the initial PQ concentration, applied voltage, flowrate, treatment time, and cycle stability testing in the batch mode approach. The applied voltage had a beneficial effect on the removal efficiency, whereas the removal efficiency of PQ declined as the initial PQ concentration increased. However, the electrosorption capacity gradually increased with the increase of initial feed solutions’ concentration. The maximum removal efficiency and electrosorption capacity achieved at 5 mg/L and 20 mg/L PQ initial concentrations, an applied voltage of 1.2 V, and 5 mL/min flowrate were 100% and 0.33 mg/g and 52.5% and 0.7 mg/g, respectively. Washing the electrodes with distilled water achieved sequential desorption of PQ, and the process produces a waste stream that can be disposed of or treated further. Therefore, the CDI method is considered a promising and efficient method for removing organic pollutants from water including pesticides.