The Lactobacillus plantarum screened from the Northeastern pickle was used as experimental strain, and the modified trichloroacetic acid method was applied to extract peptidoglycan from the strain. The extracts were identified structurally and analyzed physico-chemically. The extracted peptidoglycan was microencapsulated using chitosan. The oral administration of peptidoglycan microspheres was tested for the sustained release using mouse as experimental animals. The major experimental procedure and results ...