Answer (1 of 2): As stated by Andrea, arbutin is converted to hydroquinone and glucose by hydrolysis in dilute acids or enzymatically. Hydroquinone, more appropriately named benzene-1,4-diol, like all electron-rich phenols, is oxidised in alkaline solutions in the presence of air (oxygen), formi...

It was observed that the amount ... of urine, which is beneficial with the administration of arbutin-containing extracts, as alkaline pH enables hydrolysis of hydroquinone conjugates....

... Further well-designed, large-scale ... arbutin, which is hydrolysed in alkaline urine to hydroquinone, yielding MIC values of 0.21 to 0.6 mg/mL against E....

February 8, 2022 - The HQ conjugates are not reactive ... may be hydrolysed in the alkaline conditions of urine, forming free HQ that possess toxic effects against bacteria that cause UTI (Yarnell, 2002)....

Deconjugation of hydroquinone likely ... are localized in lysosomes. Alkalization of the urine seems not to be a prerequisite to improve the antiseptic properties of hydroquinone released from arbutin....

May 18, 2016 - The 64-75% of orally ingested arbutin is excreted in urine as conjugated hydroquinone. In case of urinary tract infection, pathogenic bacteria, such as Escherichia coli, can break down the urea.

September 10, 2026 - Metabolic transformation of arbutin takes place via enzymatic hydrolysis of the compound. In particular, arbutin is transformed into its active metabolite, hydroquinone, by β-glucosidase enzymes present in the intestinal microflora and liver.

September 1, 2002 - ... ... The active component of ... tract, metabolized to glucuronide in the liver, and hydrolyzed during renal excretion to form the active compound, hydroquinone, which is believed to have local antiseptic activity on the ...

In case of urinary tract infection, pathogenic bacteria, such as Escherichia coli, can break down the urea. As a consequence urine becomes alkaline and this pH change causes the release of the free form hydroquinone which possesses antibacterial activity[6,7,8,9].

Arbutin was nominated by the National · Institute for Environmental Health Sciences (NIEHS) for in vitro and in vivo metabolism and disposition · and genotoxicity studies. The nomination is based on widespread human exposure, insufficient · toxicological data, and suspicion of toxicity due to hydrolysis to hydroquinone (HQ).

May 15, 2024 - AR exhibits sensitivity to heat and light, particularly ultraviolet rays, and is prone to hydrolysis and decomposition into HQ under high temperatures, ultraviolet exposure, or dilution in an acidic environment [10]. The decomposition of AR initiates around its melting point of approximately 200°C and concludes at 288°C. Moreover, If the pH of the basic environment goes towards acidic (pH=4) or alkaline (pH=12) environments, it will be decomposed [7]. The skin's natural microflora bacteria, including Staphylococcus epidermidis and Staphylococcus aureus, enhance AR decomposition into HQ [11]. Simultaneously, HQ, known for its suboptimal chemical stability, is susceptible to oxidation, leading to decomposition into p-Benzoquinone.

March 1, 2005 - Possibilities of arbutin production using plant biotechnology methods ... ... In case of urinary tract infection, pathogenic bacteria, such as Escherichia coli, can break down the urea.

3 weeks ago - Hydroquinone itself is a skin bleaching agent. For centuries, β-arbutin has been used in phytotherapy, or herbal medicine. Extracted from the leaves of bearberry plants, it is used as a mixture with other herbal drugs as a treatment for urinary tract infections.

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October 1, 2008 - ... Thermal decomposition starts at its melting point (200°C) and terminates at 288°C [12]. Arbutin may release hydroquinone following in vivo cleavage of the glycosidic bonds or via hydrolysis by human skin bacteria

The effect of Arbutin seems to be due to the fact that it hydrolyses to Hydroquinone.

August 7, 2024 - After oral application of arbutin the glycoside is hydrolized rapidly and the resulting aglycone, hydroquinone, is consequently combined with glucuronic acid or sulfuric acid and renally excreted in this form. Arbutin is an effective urinary desinfectant if the following two conditions are realized: (a) The non–toxic glycoside should be given in large doses. (b) An alkaline reaction of the urine is needed because the active compound, hydroquinone, must be generated from its inactive esters...

August 5, 2008 - All strains hydrolyzed arbutin, with activities of 0.16–4.51 nmol/min/mg. The hydrolyzed hydroquinone showed more potent 1,1-diphenyl-2-picrylhydrazyl radical scavenging activity and tyrosinase inhibition than arbutin.

Bang, S. H., Han, S. J., & Kim, D. H. (2008). Hydrolysis of arbutin to hydroquinone by human skin bacteria and its effect on antioxidant activity. Journal of Cosmetic Dermatology, 7(3), 189-193.

blood in the urine (hematuria). Patients suffering from upper UTIs may have fever and flank · discomfort [22]. Arbutin is absorbed immediately by glucose transporters and subsequently · hydrolyzed in the liver to produce aglycone (also known as hydroquinone) and glucose [23].