Scientia Agricultura Sinica ›› 2020, Vol. 53 ›› Issue (10): 2066-2077.doi: 10.3864/j.issn.0578-1752.2020.10.013

• SPECIAL FOCUS: QUALITY OF AGRICULTURAL PRODUCTS • Previous Articles     Next Articles

Quality Improvement of Rapeseed Meal Based on Static-State Fermented with Mixed Microorganisms

HAO YiNing,WANG ZhiGao,HE Rong,JU XingRong,YUAN Jian()   

  1. College of Food Science and Engineering, Nanjing University of Finance and Economics/Collaborative Innovation Center for Modern Grain Circulation and Safety of Jiangsu Province/Key Laboratory of Grains and Oils Control and Processing of Jiangsu Province, Nanjing 210023
  • Received:2019-09-29 Accepted:2019-12-20 Online:2020-05-16 Published:2020-05-22
  • Contact: Jian YUAN E-mail:13611513715@163.com

Abstract:

【Objective】A study was conducted to investigate effects of innoculation with a combination of Bacillus subtilis and Actinomucor elegans on the nutritional value and sensory characteristics of double-low rapeseed meal, and to evaluate the safety by in vivo experiment, so as to provide a theoretical basis for the utilization and deep development of rapeseed meal in the food industry. 【Method】The double-low rapeseed meal was used as the research object, and the static-state fermentation was used instead of the traditional stirring-state fermentation. The nutritional components (crude protein, water-soluble protein, small peptide, amino acid and tetramethylpyrazine) and anti-nutrient components (glucosinolates, phytic acid and crude fiber) of rapeseed meal after fermentation were determined, and then based on the odor and taste differences of electronic nose and electronic tongue, the correlation analysis and principal component analysis were used to evaluate the effect of static fermentation of mixed bacteria on quality of double-low rapeseed meal. The effects of fermented rapeseed meal on the growth performance of rats were studied preliminarily. These studies provided a theoretical basis for the application of fermented rapeseed meal products. 【Result】The results showed that soluble protein, peptides and total amino acid were increased by 96.7%, 281.48% and 19.58%, respectively after fermentation. Most rapeseed proteins were degraded into oligopeptides and amino acids with molecular weight between 500 Da and 108 Da. Tetramethylpyrazine, a new nutrient, was detected after fermentation. The concentration of tetramethylpyrazine reached 590 mg?kg-1 on the fifth day of fermentation. The contents of glucosinolates, phytic acid and crude fibers were decreased by 45.26%, 41.37% and 31.16%, respectively. The results of electronic nose and electronic tongue analysis showed that the flavor and taste of rapeseed meal changed significantly before and after fermentation, and the acid taste of rapeseed meal increased significantly after fermentation. Animal experiments showed that the addition of fermented rapeseed meal and other nitrogen instead of 25% soybean meal to rat diet could significantly increase the average daily intake and average daily weight gain of rats, and there was no damage to the kidney, thymus and liver of rats. 【Conclusion】The inoculant and fermentation method in the study could improve the nutritional value and flavor properties, and the fermented rapeseed meal could improve the growth performance of rats.

Key words: static-state fermentation, rapeseed meal, tetramethylpyrazine, electronic nose, electronic tongue, Bacillus subtilis, Actinomucor elegans

Fig. 1

Effect of static fermentation on antinutrients (A) and nutrients (B) in rapeseed meal Different lowercase letters indicate significant difference (P<0.05)"

Fig. 2

Molecular weight distribution of peptides in rapeseed meal during fermentation"

Table 1

Types and contents of amino acids in rapeseed meal and fermented rapeseed meal"

氨基酸
Amino acid
菜籽粕中氨基酸含量Amino acid content in RSM (g/100 g)
菜籽粕 RSM 1 d 3 d 5 d
天冬氨酸 Asp 2.05a 2.33b 2.97c 2.91d
苏氨酸 Thr 1.39a 1.55b 1.62b 1.59b
丝氨酸Ser 1.34a 1.37a 1.42b 1.47b
谷氨酸Glu 5.18a 5.4b 5.98c 6.03c
甘氨酸Gly 1.65a 1.65a 1.69a 1.66a
丙氨酸Ala 1.45a 1.5ab 1.52ac 1.55d
半胱氨酸Cys 0.32a 0.51b 0.68c 0.63d
缬氨酸Val 1.57a 1.6a 1.56a 1.52b
甲硫氨酸Met 0.56a 0.63b 0.76c 0.76c
异亮氨酸Ile 0.96a 1.21b 1.23bc 1.16c
亮氨酸Leu 2.08a 2.24b 2.72c 2.73c
酪氨酸Tyr 0.81a 0.86b 0.91c 0.97d
苯丙氨酸 Phe 1.1a 1.35b 1.95c 1.92c
赖氨酸 Lys 1.51a 1.6b 1.73c 1.71c
组氨酸 His 0.78a 0.9b 0.97c 0.86b
精氨酸 Arg 1.8a 1.98b 2.03bc 1.94c
脯氨酸 Pro 1.55a 1.75b 1.8b 1.8b
必须氨基酸 Essential amino acids 9.17a 10.18b 11.57c 11.49c
总氨基酸 Total amino acids 26.1a 28.43b 31.54c 31.21c

Fig. 3

Chromatographic charts of tetramethylpyrazine in rapeseed meal (A), changes of tetramethylpyrazine content during fermentation (B)"

Fig. 4

Radar fingerprint chart (A) and PCA (B) of electronic nose data for rapeseed meal at different fermentation times"

Fig. 5

Radar fingerprint chart (A) and PCA (B) of electronic tongue data for rapeseed meal at different fermentation times"

Table 2

Effects of fermented rapeseed meal on body weight, feed intake and immune organ index in rats"

项目 Items 菜籽粕 RSM 发酵菜籽粕 FRSM
胸腺指数 Thymus index 13.27±0.87a 13.58±0.94a
脾脏指数 Spleen index 21.98±1.14b 21.47±0.68b
0-21 d
平均日采食量 Average daily feed intake 22.67±1.33a 24.14±1.75b
平均日增重 Average daily weight gain 6.95±0.21a 7.48±0.14b
21-42 d
平均日采食量 Average daily feed intake 25.92±1.08a 28.69±0.95b
平均日增重 Average daily weight gain 2.38±0.11a 2.12±0.08a

Fig. 6

Spleen morphology of mice in all groups (HE staining, ×200) A: Kidneys; B: Thymus; C: Liver; S: Soybean meal group; FR: Fermented rapeseed meal group"

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