PCA score plots, PLS-DA score plots, and PLS loading plots of six FSPs (NT: natto, CG: cheonggukjang, DJ: doenjang, MS: miso, DB: doubanjiang, TM: tianmianjiang). (A) PCA score plot, (B) PLS-DA score plot, and (C) PLS-DA loading plot derived from GC-TOF-MS; and (D) PCA score plot, (E) PLS-DA score plot, and (F) PLS-DA loading plot derived from UHPLC-LTQ-IT-MS/MS. Plot annotation: 1, serine: 2, threonine: 3, alanine: 4, glycine: 5, isoleucine: 6, phenylalanine: 7, leucine: 8, methionine: 9, valine: 10, proline: 11, ribose: 12, ribitol: 13, maltose: 14, xylitol: 15, glycerol: 16, galactose: 17, myo-inositol: 18, sucrose: 19, N-acetyl-D-glucosamine: 20, pinitol: 21, glutaric acid: 22, gluconic acid: 23, fumaric acid: 24, acetic acid: 25, benzoic acid: 26, ribonic acid: 27, lactic acid: 28, linolenic acid: 29, stearic acid: 30, glyceryl palmitate: 31, hydroxylamine: 32, genistein derivatives: 33, daidzein derivatives: 34, genistin: 35, malonyldaidzin: 36, malonylgenistein: 37, glycitein: 38, genistein: 39, daidzin: 40, dehydrosoyasaponin I: 41, soyasaponin III: 42, soyasaponin IV: 43, soyasaponin V: 44, soyasaponin I: 45, soyasaponin II: 46, soyasapogenol C: 47, capsaicin: 48, dihydrocapsaicin: 49, lysoPE16:0: 50, lysoPE18:1: 51, lysoPC18:2: 52, lysoPC18:3: 53, lysoPC18:1: 54, flazin: N.I., non-identified compound: 55, N.I. 1: 56, N.I. 2: 57, N.I. 3: 58, N.I. 4: 59, N.I. 5: 60, N.I. 6: 61, N.I. 7: 62, N.I. 8: 63, N.I. 9: 64, N.I. 10: 65, N.I. 11: 66, N.I. 12: 67, N.I. 13.