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Isolation, Purification and Structure Identification of Umami Peptide from Air-dried and Fermented Megalobrama Amblycephala

  

  • Received:2018-09-05 Revised:2019-06-10 Online:2019-07-25 Published:2019-07-23

Abstract: In this paper, umami peptides were isolated and purified from air-dried and fermented Megalobrama Amblycephala using ultrafiltration, nanofiltration and reversed phase high performance liquid chromatography (RP-HPLC) and the umami was measured by using electronic tongue. Matrix assisted laser desorption ionization time of flight mass spectrometer (MALDI-TOF-MS), automatic amino acid analyzer and fourier transform infrared spectroscopy (FTIR) was used to measure the molecular mass, amino acid composition and secondary structure of umami peptide to investigate the relationship between structure and umami of peptide. The results showed that a single umami peptide P2a-2 with a molecular mass of 1304.59 Da was purified and identified from air-dried and fermented Megalobrama Amblycephala. Moreover, the umami amino acids such as glutamic acid (21.97%), alanine (10.67%) and glycine (9.51%), the umami enhancer histidine (27.54%), and the secondary structure (beta- turn) with 90.16%, which were found in P2a-2, suggesting that P2a-2 presented the heavy umami due to the high content of umami amino acid and the secondary structure with beta-turn.

Key words: air-dried and fermented Megalobrama Amblycephala, peptide, umami, purification, secondary structure

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