Wheat leaves, beverages, deer antler gum, grape leaves, fresh milk, asparagus, honey, cosmetics, etc

　　Proline detection standards:

　　DBS22/008-2012 local food safety standard - Determination of L-hydroxyproline in milk and dairy products

　　DB37/T 2094-2012 Determination of hydroxyproline content in aquatic products - Liquid chromatography

　　DIN 10754-2002 Honey analysis - Determination of proline content

　　DIN EN 1141-1994 Fruit and vegetable juices - Determination of proline content

　　GB/T 9695.23-2008 Meat and meat products Determination of hydroxyproline content

　　GB/T 32946-2016 Determination of proline in honey - Liquid chromatography

　　GOST 23041-1978 Method for the determination of hydroxyproline in meat and meat products

　　ISO 3496-1994 Determination of hydroxyproline content in meat and meat products