Overview
Tangerine peel powder is derived from the dried peels of Citrus reticulata Blanco, a species native to southern China. The peels undergo sun-drying, aging (sometimes for years), and fine grinding to produce this versatile powder. Historically used in Traditional Chinese Medicine (TCM), it's now widely incorporated into modern food, beverage, and cosmetic formulations. Unlike fresh citrus zest, the drying process concentrates bioactive compounds like polymethoxyflavones (PMFs) and enhances shelf stability. Industrial buyers should note regional variations - Xinhui tangerine peel (广东新会陈皮) is particularly prized for its superior aroma and medicinal properties.
Physical and Chemical Properties
The powder exhibits hygroscopic properties due to its pectin content, requiring careful moisture control during storage. Its characteristic orange-brown color darkens with aging, while the flavor profile evolves from bright citrus notes to deeper, woody undertones. Key active components include hesperidin (3-5%), nobiletin (0.5-1.2%), and tangeretin (0.3-0.8%). These flavonoids demonstrate antioxidant and anti-inflammatory effects in studies. The essential oil content (1.5-3%) contributes to its aromatic qualities, dominated by limonene (70-90%) and γ-terpinene (5-15%).
Main Applications
In TCM formulations, the powder is used to regulate qi, resolve phlegm, and aid digestion. Modern applications include: 1. Food Industry: Natural flavoring for baked goods, teas, and condiments; some manufacturers use it as a natural preservative 2. Nutraceuticals: Encapsulated in dietary supplements for digestive health 3. Cosmetics: Incorporated into brightening serums and anti-acne preparations for its antimicrobial properties 4. Beverages: Key ingredient in craft cocktails and herbal tea blends
Safety and Storage
While generally safe, industrial users should conduct allergen screening as citrus proteins may persist through processing. EU regulation (EC) No 1334/2008 classifies it as a flavoring substance with no specified restrictions. Optimal storage involves: - Double-layer aluminum bags with oxygen absorbers - Relative humidity below 65% - Temperature stability (15-25°C) - Shelf life of 24 months under ideal conditions Batch testing should include aflatoxin screening (limit <5μg/kg) and heavy metal analysis (lead <3ppm, cadmium <1ppm).
B2B Procurement Guide
When sourcing bulk quantities (typically 25kg drums or custom batches): 1. Authentication: Request HPLC chromatograms to verify flavonoid content 2. Processing Methods: Solar-dried products command 20-30% premium over oven-dried 3. Age Verification: 3+ year aged material has different applications than fresh powder 4. Packaging Options: Nitrogen-flushed bags extend shelf life for export Leading production regions include Guangdong, Zhejiang, and Fujian provinces. MOQs typically start at 100kg, with sample quantities available for R&D purposes.
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