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Adenanthera pavonina, a potential plant-based protein resource: Seed protein composition and immunohistochemical localization of trypsin inhibitors

Hari B. Krishnan, Sunhyung Kim, Adriano E. Pereira, Alexander Jurkevich, Bruce E. Hibbard
Food chemistry: X 2022 v.13 pp. 100253
Adenanthera pavonina, chromatography, confocal microscopy, cytosol, digestion, enzyme activity, food chemistry, gastric juice, humans, immunohistochemistry, pepsin, plant source protein, polyacrylamide gel electrophoresis, protein composition, soybeans, tropical plants, trypsin, trypsin inhibitors
Adenanthera pavonina, an underutilized tropical tree, is being promoted as an alternative food source for meeting the nutritional needs of human and animals. In this study, we have shown that trypsin inhibitors as one of the predominant proteins in the seeds of A. pavonina. DE-52 column chromatography resulted in the identification of four peaks with trypsin inhibitor activity. SDS-PAGE and immunoblot analyses revealed DE-52 peaks A and B were enriched in 17 and 15 kDa proteins and these proteins cross-reacted against soybean trypsin inhibitor antibodies. Simulated gastric fluid digestion revealed that the 15–17 kDa proteins are resistant to pepsin digestion. Roasting the seeds lowered the trypsin inhibitor activity while boiling intact seeds elevated the enzyme activity. However, the trypsin inhibitor activity was completely abolished when the seeds were boiled without their seed coats. Immunohistochemical detection and confocal microscopy demonstrated that trypsin inhibitors were localized in the cell cytosol.