Biomedical subjects

Wibul Wongpoowarak

Publications and source records attributed to Wibul Wongpoowarak.

4 recordsLinked to original sources

PubMed2006

Prediction of solubility parameters using partial least square regression.

The total solubility parameter (delta) values were effectively predicted by using computed molecular descriptors and multivariate partial least squares (PLS) statistics. The molecular descriptors in the derived models included heat of formation, dipole moment, molar refractivity, solvent-accessible surface area (SA), surface-bounded molecular volume (SV), unsaturated index (Ui), and hydrophilic index (Hy). The values of these descriptors were computed by the use of HyperChem 7.5, QSPR Properties module in HyperChem 7.5, and Dragon Web version. The other two descriptors, hydrogen bonding donor (HD), and hydrogen bond-forming ability (HB) were also included in the models. The final reduced model of the whole data set had R(2) of 0.853, Q(2) of 0.813, root mean squared error from the cross-validation of the training set (RMSEcv(tr)) of 2.096 and RMSE of calibration (RMSE(tr)) of 1.857. No outlier was observed from this data set of 51 diverse compounds. Additionally, the predictive power of the developed model was comparable to the well recognized systems of Hansen, van Krevelen and Hoftyzer, and Hoy.

Algorithms↗

PubMed2005

Formulation and efficacy of triamcinolone acetonide mouthwash for treating oral lichen planus.

PURPOSE: The stability of a triamcinolone acetonide mouthwash and its efficacy in treating oral lichen planus are described. METHODS: The solubility of triamcinolone acetonide in ethanol, propylene glycol, and glycerin was determined by shaking and equilibrating an excess of triamcinolone acetonide with the solvents for 72 hours. All three solvents were used in formulating a mouthwash. A stock solution of triamcinolone acetonide standard was prepared in ethanol and diluted to yield concentrations of 2, 4, 8, 12, and 16 microg/mL. Analytical sample solutions were prepared by pipetting 0.1 mL of triamcinolone acetonide mouthwash into 10-mL volumetric flasks and diluting to volume with the mobile phase. Accelerated stability studies were conducted by storing the samples in 60-mL amber glass bottles at 45, 60, 70, and 80 degrees C and 75% relative humidity until the triamcinolone concentration decreased markedly. Efficacy was tested by 20 subjects with a clinical diagnosis of and histologically confirmed symptomatic oral lichen planus who were randomized to use the mouthwash (n = 11) or the commercially available triamcinolone acetonide paste (n = 9). RESULTS: The mouthwash had a satisfactory shelf life and was well accepted by patients. Ten of 11 patients treated with the mouthwash for four weeks reported a positive response, and a complete response in signs and symptoms occurred in 4 and 5 of 11 patients, respectively. No significant difference in clinical improvement was observed between groups. CONCLUSION: A triamcinolone acetonide mouthwash had a satisfactory shelf life and was well accepted by patients. It did not have a significantly different therapeutic efficacy from the commercial paste dosage form in the treatment of oral lichen planus.

Adult↗

PubMed2002

Unified algorithm for real-time detection of drug interaction and drug allergy.

This algorithm aims at unifying and generalizing the algorithm for detecting all types of documented drug interactions such as drug-drug interactions, drug-disease interactions, drug-patient interactions (drug allergy) from patient profile information and drug-laboratory test interactions in real-time prescribing system. Ideally, the system should conform to the following criteria: (1) data independence; (2) software interconnectability; (3) knowledge expandability; (4) flexibility; and (5) computation resource efficiency. We propose a robust Structured Query Language (SQL) algorithm to detect drug interactions and drug allergy according to such criteria. We believe that this is the first public domain algorithm in SQL that could be easily implemented into most open-system prescribing software which support SQL language. The algorithm comprises two major stages: 'expand' and 'extract'. The former expands all information in the prescription with their synonyms, groups, or components. The latter extracts the documented interactions by inner-joining knowledge-base with two independent copies of the expanded prescription list simultaneously. Simulation study for speed performance indicates that this algorithm is well behaved, for the speed of computation does not grow faster than the growth in prescription size.

Algorithms↗

PubMed2002

Optimization in development of acetaminophen syrup formulation.

Formulation of acetaminophen syrup could be developed by an optimization technique to reduce the time and cost of study. Cosolvents were used in the formulation because of the low solubility of acetaminophen in water. They were composed of polyethylene glycol 4000, propylene glycol, sorbitol solution, and glycerin. Their effects on the solubility of acetaminophen and the pH of formulations were investigated. Effects on taste and price were calculated based on their properties. Simulation study of the effect of cosolvents upon the formulation scores was performed, using an algorithm based upon a simulated annealing concept to achieve the global optima and heuristic optimization concept to accelerate convergence. The program written as a Visual Basic module within Microsoft Access 97 was used to simulate and assess the optimal cosolvent amounts to achieve the most desirable formulations automatically according to the specified criteria. Formulators could customize the optimal formulation according to their needs and cost constraints by redefining the desirable outcomes in the source code of the program.

Acetaminophen↗