Arbutin (β-Arbutin) is a competitive inhibitor of tyrosinase in melanocytes, with K_i^app values of 1.42 mM for monophenolase; 0.9 mM for diphenolase. Arbutin is also used as depigmenting agents^[1]. Arbutin is a natural polyphenol isolated from the bearberry plant Arctostaphylos uvaursi, possesses with anti-oxidant, anti-inflammatory and anti-tumor properties^[2][3].

Tyrosinase^[1]

Arbutin (0.3-5.4 mM; 24 hours, 48 hours, 72 hours; B16 murine melanoma cells) inhibites the viability of B16 murine melanoma cells in a time-and dose-dependent manner^[2].
Arbutin (1.4-5.4 mM; 24 hours) increases the apoptosis rate of B16 murine melanoma cell of treatment at a dose of 5.4 mM^[2].

MCE has not independently confirmed the accuracy of these methods. They are for reference only.

Arbutin (50 mg/kg, 100 mg/kg; oral administration; every day; for 17 days; male C57BL/6 mice) pretreatment exhibits markedly protective effects on ISO-induced cardiac hypertrophy in mice^[3].

MCE has not independently confirmed the accuracy of these methods. They are for reference only.

272.25

C₁₂H₁₆O₇

497-76-7

熊果苷；熊果酚甙；熊果素；熊果叶甙；楊梅葉甘

Room temperature in continental US; may vary elsewhere.

DMSO : ≥ 50 mg/mL (183.65 mM)

H₂O : 33.33 mg/mL (122.42 mM; Need ultrasonic)

* “≥” means soluble, but saturation unknown.

请根据产品在不同溶剂中的溶解度选择合适的溶剂配制储备液；一旦配成溶液，请分装保存，避免反复冻融造成的产品失效。
储备液的保存方式和期限：-80°C, 6 months; -20°C, 1 month。-80°C 储存时，请在 6 个月内使用，-20°C 储存时，请在 1 个月内使用。

请根据您的实验动物和给药方式选择适当的溶解方案。以下溶解方案都请先按照 In Vitro 方式配制澄清的储备液，再依次添加助溶剂：

——为保证实验结果的可靠性，澄清的储备液可以根据储存条件，适当保存；体内实验的工作液，建议您现用现配，当天使用； 以下溶剂前显示的百
分比是指该溶剂在您配制终溶液中的体积占比；如在配制过程中出现沉淀、析出现象，可以通过加热和/或超声的方式助溶

• 1.

  请依序添加每种溶剂：;10% DMSO ;; 40% PEG300 ;; 5% Tween-80 ;; 45% saline

  Solubility: ≥ 2.5 mg/mL (9.18 mM); Clear solution

  此方案可获得 ≥ 2.5 mg/mL (9.18 mM，饱和度未知) 的澄清溶液。

  以 1 mL 工作液为例，取 100 μL 25.0 mg/mL 的澄清 DMSO 储备液加到 400 μL PEG300 中，混合均匀；向上述体系中加入50 μL Tween-80，混合均匀；然后继续加入 450 μL生理盐水定容至 1 mL。

  将 0.9 g 氯化钠，完全溶解于 100 mL ddH₂O 中，得到澄清透明的生理盐水溶液

• 2.

  请依序添加每种溶剂：;10% DMSO ;; 90% (20% SBE-β-CD in saline)

  Solubility: ≥ 2.5 mg/mL (9.18 mM); Clear solution

  此方案可获得 ≥ 2.5 mg/mL (9.18 mM，饱和度未知) 的澄清溶液。

  以 1 mL 工作液为例，取 100 μL 25.0 mg/mL 的澄清 DMSO 储备液加到 900 μL 20% 的 SBE-β-CD 生理盐水水溶液中，混合均匀。

  将 2 g 磺丁基醚 β-环糊精加入 5 mL 生理盐水中，再用生理盐水定容至 10 mL，完全溶解，澄清透明
• 3.

  请依序添加每种溶剂：;10% DMSO ;; 90% corn oil

  Solubility: ≥ 2.5 mg/mL (9.18 mM); Clear solution

  此方案可获得 ≥ 2.5 mg/mL (9.18 mM，饱和度未知) 的澄清溶液，此方案不适用于实验周期在半个月以上的实验。

  以 1 mL 工作液为例，取 100 μL 25.0 mg/mL 的澄清 DMSO 储备液加到 900 μL玉米油中，混合均匀。

• [1]. Garcia-Jimenez A, et al. Action of tyrosinase on alpha and beta-arbutin: A kinetic study. PLoS One. 2017 May 11;12(5):e0177330.

  [2]. Jiang L, et al. Investigation of the pro-apoptotic effects of arbutin and its acetylated derivative on murinemelanoma cells. Int J Mol Med. 2018 Feb;41(2):1048-1054.

  [3]. Nalban N, et al. Arbutin Attenuates Isoproterenol-Induced Cardiac Hypertrophy by Inhibiting TLR-4/NF-κB Pathway in Mice. Cardiovasc Toxicol. 2019 Sep 4.