1.Quality standard: [Ingredient]: Oleuropein [plant origin]: Olea europaea L [Assay]: HPLC [Purity]: 20%、40%、90%、98% [Molecule formula]: C25H32O13 [Molecule weight]: 540.52 [Appearance]: 20%,40%: yellow-green powder, has special odor 90%: almost white powder 98%: light yellow crystalline powder [CAS No.]: 32619-42-4 [Lose in drying]: <5% [Residue on ignition]: ≤0.5% [Heavy metal]: <10PPM [Solvent residual]: <0.1PPM. 2. Microbiology standard: [Total bacteria]: <1000CFU/gm [Colibacillus]: Not Detected [Salmonella]: Not Detected [Molds and Yeasts]: <100CFU/gm. We are big manufacturer of Oleuropein, can provide you this product with the specifications of 20%、40%、90% and 98%. If you are interested in this product, please contact us with no hesitate! . 25kgs/barrel for a minimal package.