Scientia Agricultura Sinica ›› 2020, Vol. 53 ›› Issue (6): 1256-1268.doi: 10.3864/j.issn.0578-1752.2020.06.017

• FOOD SCIENCE AND ENGINEERING • Previous Articles     Next Articles

Effect of Pre-Enzymatic-Drum Drying Process on the Quality of Whole Wheat Flakes

Ke YU1,2,Lei LIU2,RuiFen ZHANG2,JianWei CHI2,XuChao JIA2,MingWei ZHANG1,2()   

  1. 1 College of Life Sciences, Yangtze University, Jingzhou 434000, Hubei
    2 Sericultural & Agri-Food Research Institute Guangdong Academy of Agricultural Sciences/Key Laboratory of Functional Foods, Ministry of Agriculture and Rural Affairs/Guangdong Key Laboratory of Agricultural Products Processing, Guangzhou 510610
  • Received:2019-08-07 Accepted:2019-09-29 Online:2020-03-16 Published:2020-04-09
  • Contact: MingWei ZHANG E-mail:mwzhh@vip.tom.com

Abstract:

【Objective】 The purpose of this study was to explore the effect of pre-enzymatic-drum drying treatment on the quality characteristics of whole wheat groats, which provided a theoretical basis for the processing of high-quality whole wheat groats.【Method】The whole wheat flour was used as raw material, and α-amylase, cellulase and its complex enzyme were used for pre-enzymatic-drum drying to prepare whole wheat flakes: drum-dried whole wheat groats (DWG), drum-dried whole wheat cereal Groats with α-Amylase (DWGA), drum-dried whole wheat groats with cellulase (DWGC), and drum-dried whole wheat groats with α-Amylase and cellulase (DWGAC). The fine wheat flakes were prepared by direct drum drying, namely drum-dried refined wheat Groats (DRG). And then, the flake indexes were determined, such as its rehydration rate, agglomeration rate, water solubility index, water absorption index, gelatinization degree, viscosity, color, starch, reducing sugar, phytic acid content and starch and protein digestion characteristics, to compare and analyze the effect of pre-enzymatic-drum drying process on the quality characteristics of whole wheat flakes. 【Result】 The pre-enzymatic-drum drying treatment could significantly improve the brewing properties of whole wheat groats. Among them, DWG sample had the lowest rehydration rate and the DWGAC rehydration rate was the highest. Compared with the control sample DWG, the agglomeration rates of DWGA, DWGC and DWGAC were significantly reduced, respectively. Pre-enzymatic-drum drying treatment significantly improved the solubility of whole wheat groats, with DWGA, DWGC, and DWGAC increasing by 4.98, 2.07, and 5.04 times, respectively, compared to DWG water solubility index. Meanwhile, pre-enzymatic-drum drying treatment significantly reduced the starch and phytic acid content of whole wheat groats (P<0.05), while the reducing sugar content and gelatinization degree increased significantly (P<0.05), and the color of the whole wheat flakes was appropriately reduced. In addition, pre-enzymatic-drum drying treatment significantly increased the proportion of fast-digesting starch in whole-grain tablets, and the content of fast-digesting starch were increased by 22.34%, 34.84% and 46.59%, respectively. Among them, DWGAC had the highest fast-digesting starch content; the in vitro digestibility of the protein were increased by 0.33, 0.25, and 0.26 times, respectively, so the digestibility increased.【Conclusion】The pre-enzymatic-drum drying treatment not only improved the dispersibility of whole wheat groats and reduced the agglomeration rate and viscosity, but also improved the in vitro digestion performance of starch and protein, which enhancing the quality of whole wheat groats.

Key words: whole wheat flakes, pre-enzymatic hydrolysis-drum drying, nutrient digestion characteristics, quality characteristics

Table 1

Effects of different processes on the rehydration and liquidity of drum drying whole wheat flakes"

样品 Sample 复水速率 Rehydration rate (g∙min-1) 结块率 Agglomerate rate (%) 糊化度 Gelatinization (%)
DRG 32.90±0.51b 77.86±0.83c 65.85±8.10b
DWG 31.51±0.11a 82.86±18.75c 47.13±14.80a
DWGA 34.35±0.26c 24.93±5.74a 87.27±7.05c
DWGC 33.63±0.07b 56.13±9.26b 85.36±2.63c
DWGAC 35.16±0.22d 15.46±3.51a 87.88±6.66c

Fig. 1

Effects of different processes on the water absorption index and the water soluble index of drum drying whole wheat flakes Different lowercase letters indicate significant differences (P<0.05). The same as below"

Table 2

Effects of different processes on the chrominance of drum drying whole wheat flakes"

样品 Sample L* a* b* ΔE*
DRG 77.68±1.68c 0.13±0.03a 17.04±0.63a -
DWG 70.69±2.04b 2.80±0.49b 18.73±1.34a -
DWGA 62.70±0.82a 4.23±0.44c 22.57±0.29bc 8.98
DWGC 62.20±1.76a 4.26±0.29c 21.08±1.50b 8.93
DWGAC 64.55±1.65a 4.46±0.30c 24.29±0.36c 8.41

Table 3

Effects of different processes on the pasting properties of drum drying whole wheat flakes"

样品
Sample
峰值黏度
Peakviscosity (cp)
最低黏度
Trough (cp)
最终黏度
Final viscosity (cp)
衰减值
Breakdown (cp)
回生值
Setback (cp)
DRG 829.66±116.47c 679.00±70.36b 1518.33±146.14b 150.66±46.18b 839.33±75.86b
DWG 1002.33±26.16d 653.00±12.77b 1682.33±49.89c 349.33±13.50c 1029.33±39.17c
DWGA 36.66±4.16a 12.33±4.61b 18.00±1.73a 24.33±1.15a 5.66±2.88a
DWGC 158.66±38.01b 36.00±1.00a 44.66±3.51a 122.66±37.52b 8.66±3.05a
DWGAC 34.66±0.58a 13.33±4.16a 17.66±5.86a 25.33±2.52a 5.33±2.31a

Fig. 2

Effects of different processes on the total starch content and the reducing sugar content of drum drying whole wheat flakes"

Fig. 3

Effects of different processes on the phytic acid content of drum drying whole wheat flakes"

Fig. 4

Effects of different processes on the dietary fiber content of drum drying whole wheat flakes"

Fig. 5

Effects of different processes on the in vitro digestion of starch of drum drying whole wheat flakes"

Fig. 6

Effects of different processes on the in vitro digestion of protein of drum drying whole wheat flakes"

Fig. 7

Effects of different processes on the pepsin, trypsin digestion end rate of drum drying whole wheat flakes"

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