A General Protocol for Synthesizing Thiolated Folate Derivatives

Question

1. What is the significance of sulfhydryl in folic acid modification?

2. What is the conversion rate and selectivity of synthesizing high-purity disulfide using iodine as an oxidant and water as a solvent?

3. What are the sources of Folic acid, 2-Hydroxy-1-ethanethiol, and dimethyl sulfoxide (DMSO) used in the Materials section?

4. What is the synthesis process of Disulfide (SS) using iodine as an oxidant?

Accepted Answer

Sulfhydryl is a bioactive substance that can be bio-coupled with drug carrier molecules such as proteins, DNA, or metal nanoprobes. It is a key component in introducing the sulfhydryl group into the folic acid molecule chain due to its high chemical activity, which is higher than that of the hydroxyl and amine groups. Modifying folic acid with disulfide (SS) and then breaking the disulfide bond to form thiolated folic acid (TFa) greatly facilitates applications of FA. The purity of synthesized TFa is higher than 98.20%, making it suitable for various biological applications and targeting performance.

Accepted Answer

The conversion rate of the reaction was 83.16%, based on the UV-Vis spectrum, and the yield of SS was 70.13%. The selectivity of the reaction was 94.79% for the production of SS, with a total apparent selectivity of 99.44%. The sulfhydryl group was successfully transformed into a S-S bond, as confirmed by near-infrared spectrum, gas chromatography spectrum, nuclear magnetic resonance spectroscopy, and Raman spectroscopy. The purity of the isolated SS was higher than 99.44% based on GC-MS, which was higher than that reported in the pioneering literature.

Accepted Answer

Folic acid, 2-Hydroxy-1-ethanethiol, and dimethyl sulfoxide (DMSO) were purchased from Tianjin Guangcheng Chemical Reagent Co., Ltd. located in Tianjin, China. These reagents were analytically pure and used as received for the research. Tianjin Guangcheng Chemical Reagent Co., Ltd. is a reputable supplier of chemical reagents, ensuring the quality and reliability of the materials used in the research.

Accepted Answer

The synthesis process of Disulfide (SS) involves the following steps: First, 1 mmol iodine is added to 10 mL of an aqueous solution of 4 mM potassium iodide and stirred until the iodine is thoroughly dissolved. Then, 2 mmol 2-Hydroxy-1-ethanethiol is added to the above solution, and the reaction continues for two hours. Subsequently, 10 mL of ethyl acetate is added to the yellow reaction mixture and stirred for 15 min. The upper layer, the ethyl acetate solution of SS, is obtained via static layering. The disulfide is obtained via rotary evaporation. The melting point of SS is 25 * C (Section S2.9 in the Supplementary Materials), and the yield of SS was 70.13%.

Accepted Answer

TFa is used to modify AgNPs by conjugating it on the surfaces of the silver nanoparticles. In the process, a 0.1 M TFa-dilute ammonia aqueous solution is added to the mixture containing AgNPs. The mixture is stirred for 100 minutes, allowing the TFa to be conjugated on the nanoparticle surfaces. Afterward, the mixture is separated by adding an equal amount of water, resulting in a nontransparent emulsion. The emulsion is then refrigerated at 4°C for 10 minutes, causing a black powder to deposit at the bottom of the bottle. This powder is collected through centrifugation at 3000 rpm for 5 minutes, and the collected products are dispersed in 5 mL of ethanol, forming a yellow transparent solution.

Accepted Answer

The final product prepared using TFa has a purity level higher than 98.20%. This high purity level indicates that the synthesis process is efficient and reliable. The method used for preparing TFa is simple, easy to handle, and yields a high purity product. The successful preparation of TFa with such purity opens up various applications in drug delivery systems, disease diagnosis, and cancer therapy, particularly when combined with metal nanoparticles. The high purity of TFa also suggests that it can be directly used as a targeting reagent in these applications without the need for further purification. Additionally, the method's potential for fabricating derivatives of other organic compounds and its new technique for the biological application of folic acid make it a valuable research area for further exploration and development.

A General Protocol for Synthesizing Thiolated Folate Derivatives

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Most frequently asked questions

1. What is the significance of sulfhydryl in folic acid modification?

2. What is the conversion rate and selectivity of synthesizing high-purity disulfide using iodine as an oxidant and water as a solvent?

3. What are the sources of Folic acid, 2-Hydroxy-1-ethanethiol, and dimethyl sulfoxide (DMSO) used in the Materials section?

4. What is the synthesis process of Disulfide (SS) using iodine as an oxidant?

5. How is TFa used to modify AgNPs?

6. What is the purity level of the final product prepared using TFa?

Citations

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References

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Aerobic oxidation of thiols to disulfides catalyzed by diaryl tellurides under photosensitized conditions.

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