Lycium fruit polysaccharides across major species: A review

Fruit polysaccharides from Lycium barbarum, Lycium chinense and Lycium ruthenicum comprise chemically distinct preparations rather than one bioactive substance. This critical review examines how processing, molecular architecture and assay conditions determine defensible comparisons among these materials. Original compositions retain their analytical basis; apparent chromatographic masses, parent fractions and structural derivatives are distinguished. L. chinense studies provide chemical evidence for Ser- or Ser/Thr-linked arabinogalactan-proteins. Selective degradation of L. ruthenicum LRGP3 produces different rankings in complement-fixation and macrophage assays, showing endpoint-dependent responses to structural remodeling. Direct matrix studies reveal non-monotonic protein-gel responses: 0.5% LBP increases gelatin gel strength without a significant increase in melting temperature, whereas starch gelatinization peak temperature rises as enthalpy falls. Recent nanovaccines and ionically crosslinked hydrogels extend macromolecular applications, but their components, release assays and route-specific controls define what can be attributed to the polysaccharide. A small human trial concerns one commercial tablet, and its cytokine follow-up is not independent replication. Current evidence supports preparation- and endpoint-specific functionality, not a universal optimum molecular mass or intrinsically superior species. Standardized extraction records, harmonized structural characterization and source-linked structure-function databases can support the development of chemically traceable functional ingredients.