Questions tagged [medicinal-chemistry]
Medicinal chemistry is the process of design, synthesis, and testing of molecules (drugs) for the treatment of infection and disease. The medicinal-chemistry tag should be applied to all questions relating to this process, from the theoretical aspects of drug design (screening, computational studies, synthesis planning) to the practical aspects of the actual synthesis, characterisation and testing of the molecule.
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questions
4
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1answer
95 views
Why are drugs mixed with their sodium salts?
I have come across quite a few drugs that are of the form $\ce{HA + NaA}$, where $\ce{A}$ is your target organic compound. A few examples of this are:
Carmicide which is a mixture of Sodium Citrate ...
1
vote
2answers
52 views
Is a liquid vitamin E supplement possible without additives? [closed]
Looking at E vitamin products sold commercially, all “pure vitamin E oil” products seem to be for skincare rather than consumption as a supplement.
I have read that d-alpha tocopherol is the form of ...
1
vote
0answers
41 views
Calculating the solubility of aspirin in water
I am trying to investigate the relationship between the solubility of aspirin in water with the relationship to some variables. In my investigation, I seem to be stuck with the calculation of finding ...
1
vote
1answer
44 views
What is the maximum amount of medicine that could accumulate in the body if the compound has a half-life of 24 hours? [closed]
If a patient is prescribed 25mg per day of a compound that has a half-life of roughly 24 hours, what is the maximum accumulated amount of the medicine that would build in the patients body?
1
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0answers
63 views
How did the tablet become like this?
How did the tablet become like this?
There was a gap in the packet, so I'm guessing it reacted with moisture but is it so?
Edit: Composition of 'Tendocare'- Chondroitin Sulfate and Vitamin C ...
0
votes
3answers
104 views
Strontium-89 vs strontium-90
Why is radioactive strontium-89 is considered medically useful for bones (along with other benefits) whereas strontium-90 (also being radioactive) is harmful for human body?
How does the addition of ...
4
votes
1answer
80 views
Why is barium used instead of bismuth as a contrast in gastrointestinal xrays?
Why is barium used instead of bismuth as a contrast in gastrointestinal x-rays? Bismuth is a heavy metal that has a relatively low toxicity in comparison to barium. Is there a particular property of ...
-1
votes
1answer
42 views
Separation of sugar and fat in a column chromatography [closed]
I am chemist at organic and bioorganic chemistry,I want to know if we are separating sugar and fat in a column chromatography who will be down first ? and why ?
Thank you.
-1
votes
1answer
35 views
Which of these chemicals share a likeness in structure with benzodiazepines causing false-positives in urine tests? [closed]
Below are potential culprits:
Quetiapine, Oxcarbazepine, and Valproate feature in the current medicine regime.
Olanzapine was discontinued quite recently.
Quetiapine XR (increased to 400mg) and an ...
-1
votes
1answer
31 views
12
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1answer
5k views
How to count free rotatable bonds
I am having difficulties to count the number of free rotating bonds for the Lipinski and Veber rules. What are the rules in doing so?
In Vemurafenib (shown above), which bonds are considered ...
2
votes
1answer
91 views
Tip of my tongue: what is the name of this process?
I remember back in Chemistry class, we did this thing where we would drop some liquid into a solvent. The moment it touched the solvent, it would turn into a gel sphere with the solvent inside it, and ...
10
votes
1answer
229 views
Why is there a comparative lack of variety in positive counterions in drugs?
Pharmaceutical salts are important in the process of drug development. Using different chemical species to neutralise the parent drug can produce a diverse series of compounds, and this process is ...
2
votes
2answers
700 views
NaHCO3 required to raise pH of weak HCl solution from 3.5 to 7.2 (doubting my calculations)
I'm a dentist, working on a medical device that will make shots at the dentist office hurt a lot less. The device mixes a drug (2% Lidocaine) that has been acidified with $\ce{HCl}$ to pH 3.5 for ...
2
votes
0answers
662 views
How do you remove residual Lawesson's reagent after thionation?
I am currently synthesizing a peptidomimetic bioisostere that replaces an oxygen with a sulfur. I use lawesson's reagent to achieve this, and althought the reaction works and despite running it ...
5
votes
0answers
39 views
Cytotoxicity of Ru-complexes
I have a basic question: why are Ru(II)-complexes cytotoxic?
What I know is that depending on the used ligand some of them interact with the DNA either via DNA-pi-stacking (intercalation) or binding ...
1
vote
0answers
57 views
How to find all published Pharmacophore Structure of a Drug target?
Other than literature review how do you find the structures of Pharmacophore of a drug target? I am searching Pyruvate Dehydrogenase Kinase (PDK) inhibitors and I have reviewed lots of literature but ...
13
votes
1answer
183 views
Trustworthiness of IC50 values
My two questions: Is replication of recording $\text{IC}_{50}$ values prior to (primary?) publication less common than performing a reaction several times to determine a more reliable record? Provided ...
-2
votes
1answer
494 views
Does chlorine in tap water usually contain traces of cornstarch (or its derivatives)? [closed]
My online research has been challenging to separate out the corn starch or corn Derivatives that are obviously in chlorine weather in tap water or pools. There is medical support backing it but I ...
2
votes
1answer
536 views
What concentration of small molecule binding is considered weak or strong?
In the chemistry literature, I often see a stated concentration (nanomolar, micromolar, millimolar) followed by qualitative judgment on the potency of the small molecule for protein inhibition. What ...
4
votes
0answers
797 views
Reasoning for baking soda treating poison ivy rashes
A quick Google search will show that baking soda (sodium bicarbonate) mixed with water in a 3 to 1 ratio will make a paste to be applied on poison ivy rashes. This is commonly advertised as a home ...
2
votes
3answers
5k views
Determine from pKa if acid or base
I'm studying medicine, not chemistry, but I hope you can help me anyway.
I just had to solve a question where it is given that the drug Propranolol has a $\text{p}K_{\text{a}}$ of 9.5 and the un-...
1
vote
1answer
184 views
What is the significance of Sphingolipids in human?
I want to know the significance of sphingolipids in human. I have learnt that sphingomyelin is the most significant type of sphingolipid in human. Also that the sphingomyelin serves as a structural ...
3
votes
2answers
1k views
Betaine HCl stomach pH
It seems betaine HCL is often recommended for those suffering from "low stomach acid" -- which, as I understand, is having too high stomach pH for proper digestion (especially for proteolysis via ...
1
vote
0answers
22 views
For Penicillin Binding proteins, why is the Enzyme-peptide complex less stable than an enzyme-β-lactam complex?
I'm trying to figure this out. I cannot find any publications that go into good detail about the chemistry of PBP inhibition by β-lactam antibiotics.
PBPs cross-link adjacent pentapeptides to form ...
2
votes
1answer
444 views
In the graph provided, which of the substances is the most efficient in acting as an antacid?
If every dot represents the addition of 0.1 g of the respective base. I suppose that the best would be the one that reaches the highest pH, in the shortest time, for example Calcium Carbonate, but if ...
0
votes
1answer
5k views
What kind of materials are plastic syringes made from?
I'm trying to figure out what kind of materials my disposable plastic syringe is made from. I have a Medefil MIS-1130 syringe and when I visited the company website I couldn't find any information on ...
4
votes
1answer
750 views
General Alkaloid Extraction Process
I'm getting into alkaloid extraction from various ethnobotanicals. It is a bit frustrating trying to extract alkaloids from ethnobotanicals without good guides out there, and I wanted to make my own ...
0
votes
1answer
46 views
Different names for Fidaxomicin (OPT-80)?
Is OPT in OPT-80 an abbreviation? If so, what is the full name?
1
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0answers
516 views
Why is Fmoc base-labile and Moz acid-labile?
I'm learning about the Zuckermann approach to combinatorial chemistry in my MedChem lecture. My textbook claims that the Fmoc protecting group is base-labile while the Moz protecting groups is acid-...
5
votes
2answers
6k views
Why do halogen substituents make molecules more lipophilic?
According to my medicinal chemistry text book, halogens increase a drug’s lipophilicty. This makes no sense to me for two reasons:
Halogens are all quite electronegative and they will form a $\ce{C-X}...
1
vote
2answers
143 views
Extracting herbs with grape juice
I tried searching my question on google and did not find anything. I am looking to extract herbs with pure 100%
grape juice http://www.lakewoodjuices.com/product_detail/id-32/ ( it is pasteurized ) ...
2
votes
1answer
119 views
XlogP of octanol and water itself
According to Pubchem, the XLogP of octanol is 3 and that of water is -0.5. Why aren't they both 0 or 1 which seems to make more sense to me?
2
votes
1answer
907 views
Classical bioisosteres
Classical bioisosteres are functional groups that satisfy with the Grimm's hydride displacement law and Langmuir's definition of isosteres.
My question is why chlorine can be replaced by ...
10
votes
2answers
4k views
Is ciprofloxacin acidic or basic?
I would expect an aqueous solution of ciprofloxacin to be basic for the following reasons:
The carboxyl group has pKa = 6.09 and the secondary amino group has pKa = 8.74. Because 8.74 is further from ...
2
votes
0answers
1k views
Shape of the blood CO2 dissociation curve
What equation determines the shape of the blood $\ce{CO2}$ dissociation curve? I know that since it factors all possible forms of $\ce{CO2}$ carriage, there are a bunch of factors (e.g. Henry's law, ...
7
votes
1answer
70 views
Arterial blood CO2 content, division and partial pressure
My lecturer cites Boron and Boulpaep's Medical Physiology (2nd edition) for the following claims:
the total $\ce{CO2}$ content of arterial blood is $26.4$ mmol/L or $48\%$ v/v (not sure if these ...
8
votes
1answer
478 views
Is lithium L-threonate a potential brain medicine?
Lithium ions have known neuroprotective qualities. That would explain its therapeutic benefit in some mental disorders. It is also well known that lithium carbonate must be taken in toxic doses to get ...
0
votes
2answers
2k views
What's the difference between pharmacotherapy and chemotherapy
Is it fair to say that pharmacotherapy (the use of pharmaceuticals to treat disease) is a subset of chemotherapy (the use of chemicals to treat disease)?
If not, why? Aside from the fact the former ...
2
votes
0answers
246 views
Why are trifluoromethyl diazirines so stable?
Why are trifluoromethyl diazirines so stable?
Trifluoromethyl diazirines stability is well documented, however I am yet to find an explanation of why...
Can it be homoaromatic or even aromatic?
2 pie ...
4
votes
3answers
4k views
How do water insoluble medications get absorbed in the blood stream?
If a chemical is ingested (supplement or drug) orally, which is insoluble in water, how can it be absorbed into the body? Is there something inside a capsule that the compound is mixed with?
5
votes
1answer
875 views
Regarding the mechanism for biological activity of tyramine, amphetamine and ephedrine
Graham Patrick explains the mechanism for the activity of tyramine, amphetamine and ephedrine in his book Introduction to Medicinal Chemistry as follows:
Some amines such as tyramine , amphetamine ...
3
votes
0answers
275 views
Combining amphetamine and MAOIs
Could combining amphetamine and a (possibly selective) MAOI (MonoAmine Oxidase Inhibitor) increase the amphetamines potency without serious toxic side effects? If so by what factor, and would this be ...
10
votes
1answer
131 views
Are the tars in cannabis considerably more dangerous than those in tobacco?
The claim that "the tars in cannabis are considerably more dangerous than those in tobacco" is made in Patricks An Introduction to Medicinal Chemistry (4th edition, p. 169). It's just a simple one ...
12
votes
2answers
2k views
Effect of enatiomers in pharmaceuticals [closed]
Often (or always?) one enantiomer of a certain drug will be effective and the other ineffective or harmful. The famous example is thalidomide, where one enantiomer caused mutilation of the unborn ...
0
votes
1answer
88 views
Skin adhesive that can be used daily without damaging skin
What is the branch of chemistry that deals with skin adhesives? Is there an adhesive that is not water soluble that is safe to use every day?
6
votes
1answer
65 views
How are hormone levels measured?
I have been searching google and didn't found any links that describes how this process is performed - I mean the chemical procedure, not the process of taking the blood from the vein.
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1answer
217 views
I recently learned I'm allergic to potassium dicromate or chromium [closed]
are eye drops with inactive ingredients called potassium chloride or sodium chloride the same as potassium dichromate and should I stop using those eye drops?
2
votes
1answer
769 views
How important are those fields of chemistry in biotechnology and medicinal chemistry
At my university there is some fields of chemistry that i don't know if i should focus on them...
How important are in biotechnology and medicinal chemistry those fields of chemistry? :
Quantum ...
3
votes
0answers
35 views
PAPS , is it a carrier or not
In sulfate conjugation , is it considered as a carrier or help to make sulfonation if I got a question and I have to choose ( enzyme helps to make the reaction or is a carrier to transfer the sulfate )...
