Overview
Isosteviol is a tetracyclic diterpenoid derived from the hydrolysis and rearrangement of steviol, a natural sweetener compound found in Stevia rebaudiana leaves. Unlike steviol glycosides, it lacks sweetness but retains biological activity, making it valuable for pharmaceutical research. It is chemically stable and exhibits low toxicity, enabling diverse industrial applications. First isolated in the 1970s, isosteviol gained attention for its potential as a non-caloric sugar substitute and later for its anti-inflammatory and antihypertensive properties. Its synthesis involves acid-catalyzed rearrangement of stevioside, followed by purification. The compound is now commercially available as a high-purity intermediate for drug development and food additive formulations.
Physical and Chemical Properties
Isosteviol crystallizes as a white powder with a melting point around 215-220°C. It is lipophilic, dissolving readily in organic solvents like ethanol and methanol but only sparingly in water. The molecule's stability under heat (up to 200°C) makes it suitable for baked goods and processed foods. Its molecular structure features a carboxyl group at C19 and a ketone at C16, enabling derivatization for drug synthesis. Spectroscopic data (IR, NMR) confirm its ent-beyerane skeleton. The compound shows no optical activity due to its racemic nature post-rearrangement. Impurities typically include residual steviol or its isomers, detectable via HPLC.
Main Applications
In pharmaceuticals, isosteviol serves as a precursor for synthetic analogs with cardioprotective and antidiabetic effects. Research highlights its role in modulating ion channels and reducing oxidative stress. Current clinical trials explore its use in hypertension management. The food industry employs it as a non-sweet bulking agent or bitterness modulator in combination with other sweeteners. Cosmetic formulations leverage its anti-inflammatory properties in skincare products. Industrial-scale production focuses on ≥98% purity grades for drug development, while food-grade versions (≥95%) are cheaper and more widely available.
Safety and Storage
Isosteviol is classified as GRAS (Generally Recognized As Safe) by the FDA for food use at specified levels. Animal studies indicate low acute toxicity (LD50 >5,000 mg/kg orally in rats). No mutagenicity has been observed in Ames tests. Proper storage requires sealed containers in dry conditions below 25°C to prevent clumping. Prolonged exposure to humidity may reduce purity. For lab use, nitrogen-filled vials are recommended. Safety data sheets advise using gloves and goggles during handling, though it poses minimal dermal irritation risk.
B2B Procurement Guide
Bulk buyers should prioritize suppliers with ISO 9001 certification and batch-specific COAs. Pharmaceutical-grade (≥98%) commands a 20-30% price premium over food-grade. Key quality markers include ≤0.5% residual solvents (per ICH guidelines) and undetectable heavy metals. MOQs for industrial quantities typically start at 25 kg, with discounts for ≥100 kg orders. Spot purchases may incur 10-15% surcharges. Chinese manufacturers dominate supply, offering CIF prices at $80-$120/kg for 99% purity. EU/US vendors charge higher but provide faster logistics and regulatory support. Always audit impurity profiles for consistency.
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