4-Aminobenzoic acid
(Redirected from Potaba)
4-Aminobenzoic acid (also known as PABA, para-aminobenzoic acid) is an organic compound with the formula H₂NC₆H₄CO₂H. It is a white solid, although commercial samples can appear gray. It is slightly soluble in water. PABA is considered a member of the vitamin B complex and is known for its role as a precursor in the biosynthesis of folate in bacteria. In humans, it is sometimes referred to as Vitamin Bx, but it is not considered an essential nutrient nor recognized as a vitamin.
Structure and Properties[edit | edit source]
4-Aminobenzoic acid consists of a benzene ring substituted with an amino group (−NH₂) at the para position and a carboxylic acid group (−COOH). Its chemical structure allows it to participate in various biochemical processes, including the synthesis of folate, which is essential for the production of nucleic acids and the metabolism of amino acids.
Synthesis[edit | edit source]
4-Aminobenzoic acid can be synthesized through several chemical processes, including the Hofmann rearrangement of phthalimide, followed by hydrolysis. Another method involves the amination of benzoic acid derivatives through processes such as the Bucherer–Bergs reaction.
Biological Significance[edit | edit source]
In microorganisms, PABA is a key precursor in the synthesis of folate, which is necessary for the synthesis of purines and pyrimidines, the building blocks of DNA. This process is not present in humans, who must obtain folate through their diet. PABA itself, however, has been used in sunscreen products due to its ability to absorb ultraviolet (UV) light, reducing skin damage from UV exposure. Its use in sunscreens has declined with the development of more effective UV filters.
Medical and Cosmetic Uses[edit | edit source]
Historically, PABA was used in sunscreen formulations for its UV absorption properties. It has also been explored for its potential in treating certain skin disorders and was once considered for its nutritional value. However, its popularity has decreased due to concerns over allergic reactions and its efficacy compared to newer substances.
Safety and Regulatory Status[edit | edit source]
The safety of PABA has been a topic of discussion, particularly in its use in sunscreens and cosmetic products. Some individuals may experience allergic reactions to PABA. Consequently, its presence in cosmetic products has been regulated in various jurisdictions, and it has been largely replaced by other UV filters that are considered safer and more effective.
Conclusion[edit | edit source]
4-Aminobenzoic acid plays a crucial role in the biosynthesis of folate in microorganisms and has various industrial and medical applications. Despite its reduced use in cosmetics and sunscreens, it remains an important compound in the study of biochemistry and organic chemistry.
Search WikiMD
Ad.Tired of being Overweight? Try W8MD's physician weight loss program.
Semaglutide (Ozempic / Wegovy and Tirzepatide (Mounjaro / Zepbound) available.
Advertise on WikiMD
WikiMD's Wellness Encyclopedia |
Let Food Be Thy Medicine Medicine Thy Food - Hippocrates |
Translate this page: - East Asian
中文,
日本,
한국어,
South Asian
हिन्दी,
தமிழ்,
తెలుగు,
Urdu,
ಕನ್ನಡ,
Southeast Asian
Indonesian,
Vietnamese,
Thai,
မြန်မာဘာသာ,
বাংলা
European
español,
Deutsch,
français,
Greek,
português do Brasil,
polski,
română,
русский,
Nederlands,
norsk,
svenska,
suomi,
Italian
Middle Eastern & African
عربى,
Turkish,
Persian,
Hebrew,
Afrikaans,
isiZulu,
Kiswahili,
Other
Bulgarian,
Hungarian,
Czech,
Swedish,
മലയാളം,
मराठी,
ਪੰਜਾਬੀ,
ગુજરાતી,
Portuguese,
Ukrainian
Medical Disclaimer: WikiMD is not a substitute for professional medical advice. The information on WikiMD is provided as an information resource only, may be incorrect, outdated or misleading, and is not to be used or relied on for any diagnostic or treatment purposes. Please consult your health care provider before making any healthcare decisions or for guidance about a specific medical condition. WikiMD expressly disclaims responsibility, and shall have no liability, for any damages, loss, injury, or liability whatsoever suffered as a result of your reliance on the information contained in this site. By visiting this site you agree to the foregoing terms and conditions, which may from time to time be changed or supplemented by WikiMD. If you do not agree to the foregoing terms and conditions, you should not enter or use this site. See full disclaimer.
Credits:Most images are courtesy of Wikimedia commons, and templates Wikipedia, licensed under CC BY SA or similar.
Contributors: Prab R. Tumpati, MD