Literature Review 2.6 Summary of Literature Review This literature review can be summarised as follows: In recent years. There is a noticeable increase in the amount of drugs on the market that are poorly water soluble, and therefore have a poor bioavailability. This can be partly put down to advances in synthesis technology and development of drugs, resulting in the formation of larger, bulkier drugs which are more complicated and difficult for the body to absorb. Crystal engineering and crystallisation are effective methods of improving the bioavailability of poorly water-soluble drugs. Crystallisation is a method by which a solid can be separated from its solution while being purified, and is driven by supersaturation. A high level …show more content…
Davey, R. J., Black, S. N., Logan, D., Maginn, S. J., Fairbrother, J. E. and Grant, D. J. W. (1992) ‘Structural and kinetic features of crystal growth inhibition: adipic acid growing in the presence of n-alkanoic acids’, Journal of the Chemical Society, 88, 3461-3466. De Waard, H., Friklink, H. W. and Hinrichs, W. L. J. (2011) ‘Bottom-Up Preparation Techniques for Nanocrystals of Lipophilic Drugs’, Pharmaceutical Research, 28(5), 1220-1223. Durrington, P.N. (2012) ‘Cholesteryl Ester Transfer Protein (CETP) Inhibitors’, British Journal of Cardiology, 19(3), 126-133. Encyclopaedia Britannica (2016) ‘Nucleation – Crystallography – Britannica.com’ [online], available: https://www.britannica.com/science/nucleation [accessed 07 Nov 2016]. Farlex, Inc (2017) Crystal growth – Article about crystal growth by the Free Dictionary’ [online], available: http://encyclopedia2.thefreedictionary.com/crystal+growth [accessed 13Feb17]. García-Arieta, A. (2014) ‘Interactions between active pharmaceutical ingredients and excipients affecting bioavailablilty: Impact on bioequivalence’, European Journal of Pharmaceutical Sciences, December,
Limaye PMCY 6510 Take Home Final Exam Metformin hydrochloride (N,N-dimethylimidodicarbonimidic diamide hydrochloride) is a white to off-white crystalline compound with a molecular formula of C4H11N5•HCl and a molecular weight of 165.63. Metformin hydrochloride is freely soluble in water and is practically insoluble in acetone, ether, and chloroform. Metformin belongs to BCS class III with high solubility and low permeability. This also allows for designing a controlled release formulation of metformin hydrochloride. However, due to the high dose amounts and dosing frequency, it has been a challenge to develop once daily metformin formulation.
Firstly, intermolecular forces and strengths of different chemical substances could be identified using valence shell electron pair repulsion shapes and prior knowledge of various kinds of intermolecular forces: London Dispersion, Dipole-Dipole, and Hydrogen bonding. Knowing this, Acetone was seen to possess London Dispersion and Dipole-Dipole forces. Propanol was seen to possess London Dispersion, Dip0le-Dipole forces, and Hydrogen Bonding. Acetic Acid was seen to possess Hydrogen Bonding and Dipole-Dipole forces. Overall,
Physically, the unknown compound was composed of white, grainy, crystal-like structures. The unknown was also odorless. From these observations, various physical and chemical testing was performed to determine properties of the unidentified compound. A series of solubility tests were performed, as shown in Table 2, and revealed that the unknown compound was soluble in water, but not in Acetone or Toluene.
In this lab, three unknown compounds were separated from a mixture and identified by melting point. Unknown mixture #124 has components of acid, base and neutral compound. The compounds were identified by melting point and matched up with the known melting points from a given list. In order to identify the compound it was important to separate by dissolving the mixture in an organic solvent which was not soluble in water, and then extracting the solution first with HCl, and then dilute sodium hydroxide solution. From the separation mixture, the aqueous layer were obtained and labeled as TT-1 (base), TT-2(acid) and TT-3 (neutral) in three different test tubes for later recovery.
We then used a small mortar and pestle to crush the aspirin and we placed the resulting powder into a conical flask, we crushed the aspirin tablets so that I would be easy to mix with the ethanol. We then added 5ml of ethanol using a measuring cylinder and covered the flask with a watch glass, we did this to avoid evaporation. We then gently heated the mixture over a water bath of around 60-70°C and swirled frequently, we did this so that it would dissolve the acetylsalicylic acid. We then filtered off the hot solution to remove any insoluble material in another small conical flask, we rinsed the flask with a few ml’s of chilled ethanol to collect any residue that was left on the flask. We then slowly added 25ml of chilled deionised water to the filtrate to initiate crystallization by using a measuring cylinder and a dropping pipette, once we had done this we left it for about 10 minutes to allow crystallization at room temperature.
o Are the individual ingredients all present at active dose levels? o Is the dose spacing appropriate for each ingredient? o Is the recommended dose appropriate? (If not, discuss what dose / how much of the product would you recommend OR why it is not possible to recommend an appropriate dose.) How to present and submit your assignment •
PHAR1101– Drugs that Changed the World DRUG DISCOVERY PIONEERS EXERCISE This exercise requires you to conduct library-based research into a pioneering researcher who helped discover and develop an important drug. Please choose a pioneer from the Table on page 14 of the PHAR1101 Handbook. Perform background research on your pioneer and then write your answers in the blank squares below. Submit your Report via LMS by Friday Oct 9.
Lab Report 5: Acetylsalicylic Acid (Aspirin) Synthesis Name: Divya Mehta Student #: 139006548 Date Conducted: November 19th 2014 Date Submitted: November 26th 2014 Partner’s Name: Kirsten Matthews Lab Section: Wednesday 2:30 L9 IAs Name: Brittany Doerr Procedure: For the procedure, see lab manual (CH110 Lab Manual, Fall 2014) pages 96-98. Wilfrid Laurier University Chemistry Department. Fall 2014. Acetylsalicylic Acid (Aspirin) Synthesis.
In particular, the formulation of rosuvastatin, molecule which is generally lipophilic, poses real problems owing mainly to their low solubility in aqueous liquid pharmaceutical excipients, to their propensity to precipitate or recrystallize in aqueous solution and to their low solubility in the fluids of the gastrointestinal tract from which they must be absorbed. The bioavailability of an active ingredient also depends on its concentration in the gastrointestinal fluid, said concentration itself being dependent on the release of the active ingredient. In particular, the more lipophilic an active ingredient is, the less tendency it has to migrate in gastrointestinal fluids.
Research Proposal (3500words +/- 10%) Executive summary (150 words) Introduction (500 words) Literature review (1000 words) Defining local need (500 words) Service specification and Implementation (500 words) Evaluation (850 words) REFERENCES WORD COUNT XXXX EXECUTIVE SUMMARY: Aging is a natural phenomenon which could be normal or successful.
First, two grams on an unknown white compound were given. The possible compounds the known could be were CaCO3, KNO3, NH4Cl, CaCl2, K2SO4, (NH4)2SO2, Ca(NO3)2, NaC2H2O2, K2CO3, MgCl2, Na2CO3, 0.1 M AgNO3, MgSO4, NaCl, 0.2 M BaCl2, KCl, NaSO4, Mg(s), HCl, HNO3, NaOH, HC2H3O2, H2SO4, and KOH. The solubility test required using a scale to measure .575 of our unknown white compound. The unknown compound was measured in a 100 mL beaker.
Imagine a typical school day. You wake up in the morning and prepare for the day, and there it is. You can feel your nerves pulsating through your head as it spins hysterically. The day has just begun, and you already have a headache. This isn’t new to you, so you simply go along with it as it happens every other day.
Counterfeit Medications By Yolanda Smith, BPharm A counterfeit medication or drug is defined as a pharmaceutical product that is produced and sold with the intention to deceive the consumer about the origin, authenticity or efficacy of the product. This has the potential to be dangerous for consumers as the formulation may contain unusual ingredients or quantities of the ingredients, which can affect the effect of the medication in the body. Additionally, mislabeling of the pharmaceutical goods may also cause problems Issues with Counterfeit Medications There are several different errors that may be intentional or accidental that may cause a medication to be classified as counterfeit.
Raising the Awareness of Medication Errors Introduction Medication errors are the 3rd leading cause of death in the United States, ranked behind heart disease and cancer. 1.3 million people are injured each year because of medication errors (Melissa Conrad Stoppler, 2014). Four out of five adverse events take place in hospitals. An adverse event is “an injury caused directly by medical management rather than the underlying disease or condition of the patient” (Kohn LT, Corrigan JM, Donaldson MS, 2000). Medication errors can take place in hospitals, nursing homes, doctor offices, at home, or while receiving drugs from a pharmacy.
Abstract The unknown concentration of benzoic acid used when titrated with standardized 0.1031M NaOH and the solubility was calculated at two different temperatures (20◦C and 30◦C). With the aid of the Van’t Hoff equation, the enthalpy of solution of benzoic acid at those temperatures was determined as 10.82 KJ. This compares well with the value of 10.27KJ found in the literature.