Scientia Agricultura Sinica ›› 2020, Vol. 53 ›› Issue (6): 1247-1255.doi: 10.3864/j.issn.0578-1752.2020.06.016

• FOOD SCIENCE AND ENGINEERING • Previous Articles     Next Articles

Wheat Gluten, Gliadins and Glutenin Content Changes During Germination Based on the Methods of R5 ELISA and RP-HPLC

HuiMin HU,XueFeng PAN,Heng YANG,Chen CHEN,YinJi CHEN()   

  1. College of Food Science and Engineering, Nanjing University of Finance and Economics, Nanjing 210023
  • Received:2019-07-30 Accepted:2019-10-30 Online:2020-03-16 Published:2020-04-09
  • Contact: YinJi CHEN E-mail:chenyinji@hotmail.com

Abstract:

【Objective】 The current study was conducted to determine the dynamic changes of gluten, gliadins and glutenin contents in different germination states of wheat, so as to provide a scientific basis for the development of gluten-free food and utilization of germinated wheat. 【Method】Seven wheat grains with different germination states were obtained by controlling the germination conditions. Changes of composition of gliadins and glutenin were analyzed by sodium dedecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE), and changes of gluten, gliadins and glutenin subunits during wheat germination were further determined by enzyme-linked immunosorbent assay based on R5 antibody (R5 ELISA) and reversed-phase high-performance liquid chromatography (RP-HPLC). 【Result】The content of gluten, gliadins and glutenin subunits in wheat could be determined by R5 ELISA and RP-HPLC. Germination treatment had different effects on the allergic proteins and subunits mentioned above. The content of gluten changed little at the early stage of germination, but decreased significantly at the later stage. The relative content of ω-gliadins did not change significantly. During the germination process, the relative content of α-/β-gliadins was significantly reduced, with the percentage of untreated wheat seeds decreased from 41.85% to 31.51%-35.35% after germination (P<0.01). The relative content of γ-gliadins increased significantly from 31.37% to 36.69%-39.02% after germination (P<0.05). The relative content changes of high molecular weight glutenin subunit (HMW-GS) and low molecular weight glutenin subunit (LMW-GS) were not significant. HMW-GS decreased slightly from 8.66% (untreated group) to 5.94% (1/4 bud length) and then to 7.28% (bud length=grain length). LMW-GS increased slightly from 8.30% (untreated group) to 10.45% (bud length=grain length).【Conclusion】Both of the methods R5 ELISA and RP-HPLC could be used for quantitative analysis of wheat sensitized proteins. The content of allergenic protein in wheat decreased during germination. In particular, when the germinating bud was up to 1/2 long, the α-/β-gliadin which containing the most sensitive peptide decreased significantly. It was suggested that moderate germination treatment could reduce sensitization of wheat.

Key words: celiac disease, gliadin, glutenin, gluten, R5 ELISA, RP-HPLC

Fig. 1

Changes of wheat in different germination states A-G represent unsoaked, soaked, exposed, seed coat broken, bud length 1/4, bud length 1/2, bud length equals grain length. The same as below"

Fig. 2

SDS-PAGE of gliadins from wheat in different germination states"

Fig. 3

SDS-PAGE of glutenin from wheat in different germination states"

Fig. 4

Gluten changes during wheat germination determined by R5 ELISA The lowercase letters indicate significant differences at 0.05 level"

Fig. 5

RP-HPLC of gliadins and glutenin subunits from wheat in different germination states"

Table 1

Relative amounts of gliadins and glutenin from wheat in different germination state (%)"

亚基
Subunit
发芽状态Germination state
A B C D E F G
ω 9.48±1.06a 9.81±0.40a 9.69±0.84a 11.30±1.00a 10.20±0.37a 12.03±0.47a 10.57±0.88a
α+β 41.85±0.63A 33.81±1.65B 34.36±1.83B 35.35±0.77B 33.19±1.35B 31.51±0.32B 33.52±0.77B
γ 31.37±0.76a 36.69±0.37b 39.02±1.04b 37.62±2.40b 38.70±2.27b 37.28±1.29b 36.91±1.10b
HMW 8.66±0.61a 8.98±1.33a 8.12±1.11a 6.32±1.15a 5.94±0.34a 8.00±0.20a 7.28±0.19a
LMW 8.30±0.74a 9.80±0.61a 8.81±0.40a 8.73±0.80a 10.13±1.03a 10.49±0.33a 10.45±0.43a
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