Scientia Agricultura Sinica ›› 2023, Vol. 56 ›› Issue (20): 4102-4114.doi: 10.3864/j.issn.0578-1752.2023.20.014

• FOOD SCIENCE AND ENGINEERING • Previous Articles     Next Articles

Effects of Oat Bran Flour and Tartary Buckwheat Bran Flour on Structure, Cooking Quality and Digestive Characteristics of Wheat Noodles

PENG Pai(), WANG XiaoLong(), MA Lan, ZOU XiaoYang, MA QianYing, ZHANG XinYu, LI XiaoPing, HU XinZhong()   

  1. College of Food Engineering and Nutritional Science, Shaanxi Normal University, Xi’an 710119
  • Received:2023-04-11 Accepted:2023-07-24 Online:2023-10-16 Published:2023-10-31
  • Contact: WANG XiaoLong, HU XinZhong

Abstract:

【Objective】 This study aimed to explore the effects of oat bran flour and Tartary buckwheat bran flour addition on the structure, quality and digestive characteristics of wheat noodles, so as to confirm their application values in the production of wheat-based food products. 【Method】 Three types of noodles were prepared with three recombinant flours containing 30% oat bran flour + 70% wheat flour, 30% Tartary buckwheat bran flour + 70% wheat flour, and 15% oat bran flour + 15% Tartary buckwheat bran flour + 70% wheat flour, respectively, with pure wheat noodle as control. The cooking quality, sensory quality and digestive characteristics of different noodles were determined and compared firstly. Then the structural characteristics of protein and starch in noodles were analyzed and compared by Fourier infrared spectrometer, X-ray diffractometer, Size-exclusion high performance liquid chromatography, Scanning electron microscope and Laser confocal scanning microscope, respectively. 【Result】 The introduction of oat bran flour and Tartary buckwheat bran flour weakened the cooking and sensory quality of noodles, but improved the starch digestion resistance of noodles. The noodle containing 30% oat bran flour showed the lowest glycemic index (GI) of 47.9 among all the noodles. Protein denaturation and reconstruction during noodle cooking facilitated the binding between protein and other molecules higher proportion α-helix and lower proportion β-sheets was found in the protein of cooked oat bran noodles, which led to the transformation of protein aggregates into a loose and extended protein network that enforced the wrapping effect of protein to starch. After cooking, the starch crystal in noodles was destroyed, leading to the reduced orderliness. The addition of oat bran flour and buckwheat bran flour promoted the starch-lipid interactions in noodles, which contributed to the formation of resistant starch. Compared with buckwheat bran four, oat bran flour was more beneficial to maintaining the short-range order of starch and promoting the formation of more V-type crystals in noodle. In addition, the high content of β-glucan in oat bran flour further contributed to the interactions between starch and other molecules. 【Conclusion】 The addition of oat bran flour and Tartary buckwheat bran flour decreased the cooking and sensory quality of wheat noodle, but reduced the GI value of the noodle. The noodles containing 30% oat bran flour was a low GI food. The addition of oat bran flour and buckwheat bran flour in noodles contributed to the formation of resistant starch deriving from complex starch-protein and starch-lipid interactions during starch gelatinization. Oat bran flour was conductive to maintaining the thermal stability of protein network and improving the digestion resistance of starch in noodle by enhancing the interactions between starch and other molecules.

Key words: Tartary buckwheat bran flour, oat bran flour, noodle quality, low GI food, resistant starch

Table 1

Basic composition of three flours"

样品
Sample
淀粉含量
Starch content (%)
蛋白质含量
Protein content (%)
脂肪含量
Lipid content (%)
膳食纤维
Fiber content (%)
多酚含量
Polyphenol content (%)
小麦面粉 Wheat flour 73.30±2.11a 11.20±1.81b 1.20±0.89c 0.00c 0.52±0.50b
苦荞皮粉 Tartary buckwheat bran flour 38.61±1.70b 19.70±1.70a 5.70±1.33b 9.90±1.87b 1.22±0.61ab
燕麦麸粉 Oat bran flour 24.10±2.55c 17.90±1.11a 9.80±1.45a 20.40±1.75a 2.33±1.01a

Table 2

Sensory evaluation index and score of noodles"

评价指标
Evaluation index
满分(分)
Full score (points)
评价方法
Evaluation method
生面色泽
Color of raw noodles
10 亮白或黄亮(8—10分)Bright white or yellow (8-10 points)
亮度一般或稍暗(6—8分)Medium or slightly dim (6-8 points)
灰暗(4—6分)Gray (4-6 points)
生面气味
Smell of raw noodles
10 具有麦香味(8—10分)With wheat flavor (8-10 points)
无异味(6—8分)No odor (6-8 points)
有异味(4—6分)Smelly (4-6 points)
熟面色泽
Color of cooked noodles
10 亮白或黄亮(8—10分)Bright white or yellow (8-10 points)
亮度一般或稍暗(6—8分)Medium or slightly dim (6-8 points)
灰暗(4—6分)Gray (4-6 points)
表面状态
Surface state
10 表面光滑、有明显透明质感(8—10分)Smooth surface with obvious transparent texture (8-10 points)
表面较光滑、透明质感不明显(6—8分)Smooth surface, transparent texture is not obvious (6-8 points)
表面粗糙、明显膨胀(4—6分)Rough surface, obvious swelling (4-6 marks)
软硬度
Hardness
10 软硬合适(8—10分)Soft and hard suitable (8-10 points)
稍软或稍硬(6—8分)Slightly softer or slightly harder (6-8 points)
很软或很硬(4—6分)Very soft or very hard (4-6 points)
弹性
Elasticity
25 弹性好(20—25分)Good flexibility (20-25 points)
弹性一般(15—20分)Average flexibility (15-20 points)
弹性差(10—15分)Elasticity difference (10-15 points)
光滑性
Smoothness
20 光滑爽口(16—20分)Smooth and refreshing (16-20 points)
较光滑(12—16分)Smooth (12-16 points)
不爽口(9—12分)Not refreshing (9-12 points)
食味
Palatability
5 具有麦香味(4—5分)With wheat flavor (4-5 points)
基本无异味(3—4分)Basically odorless (3-4 points)

Table 3

The cooking quality of four noodles"

面条类型
Noodles type
最佳煮面时间
Optimum cooking time (min)
吸水率
Water absorption (%)
蒸煮损失
Cooking loss (%)
WN 4.00 76.27±1.41a 9.71±1.01c
BN 3.00 68.23±2.01b 13.32±0.12a
ON 4.00 69.12±1.40b 14.41±0.11a
OBN 3.75 68.43±1.60b 11.50±1.21b

Table 4

Sensory quality of the noodles"

面条类型
Noodles type
评分情况Grading situation
生面色泽
Color of raw noodle
生面气味
Smell of raw noodle
熟面色泽
Color of cooked noodles
表面状态
Surface state
软硬度
Hardness
弹性
Elasticity
光滑性
Smoothness
食味
Palatability
总分
Total point
WN 8.8±0.7a 8.6±1.2a 8.9±0.5a 8.7±0.7a 8.4±0.9a 22.6±0.8a 18.6±1.2a 4.8±0.3a 89.4±2.8a
BN 6.9±1.1b 7.2±1.1a 6.6±1.1b 7.1±0.8b 7.1±1.1a 18.6±2.5b 16.0±1.7a 3.9±0.2b 73.8±2.9b
ON 7.1±0.8b 7.8±1.0a 7.0±0.8b 7.9±0.9ab 7.3±1.1a 18.6±2.4b 16.8±2.2a 4.3±0.6ab 76.6±1.8b
OBN 6.9±1.0b 7.6±0.6a 6.9±1.0b 7.6±1.0ab 7.2±0.8a 18.5±2.2b 16.4±1.6a 4.1±0.6ab 75.2±1.8b

Fig. 1

Glucose response curves and glycemic index of cooked noodles Different letters indicate significant difference (P<0.05). CWN: Cooked wheat noodles; CBN: Cooked noodles with 30% Tartary buckwheat bran flour added; CON: Cooked noodles with 30% oat bran flour added; COBN: Cooked noodles with 15% tartary buckwheat bran flour and 15% oat bran flour added. The same as below"

Fig. 2

Protein polymerization of four noodles"

Fig. 3

Protein secondary structure of four noodles"

Fig. 4

FTIR and XRD patterns of four noodles"

Table 5

Starch orderliness of four noodles"

样品
Sample
长程有序度 Long-range order 短程有序度Short-range order ~860 cm−1处峰的位置
The peak location of ~860 cm−1
相对结晶度
Relative crystallinity (%)
DD值
DD value
DO值
DO value
WN 30.21±2.11a 1.0442±0.0001f 1.0594±0.0001d 860.517±1.452a
BN 21.43±0.31c 1.0772±0.0002b 1.0831±0.0004a 859.552±0.996a
ON 24.91±1.21b 1.0800±0.0001a 1.0704±0.0005b 859.231±1.056ab
OBN 27.61±0.54a 1.0648±0.0002c 1.0677±0.0002c 859.874±1.452a
CWN 1.60±0.65g 1.0291±0.0002h 1.0336±0.0001h 856.659±0.787cd
CBN 11.34±0.89d 1.0452±0.0003e 1.0525±0.0001f 856.981±0.996cd
CON 5.10±1.55f 1.0382±0.0001g 1.0381±0.0001g 855.052±0.996d
COBN 8.57±1.11e 1.0567±0.0001d 1.0553±0.0001e 857.302±1.056bc

Fig. 5

CLSM microstructure of four noodles"

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