发酵技术对食用种子及其制品改性的研究进展

王晓燕1,孙培利1,焦捷1,蒲莹1,曹效海1,2,王树林1,2,3*

(1.青海大学农牧学院,青海 西宁 810016;2.青海-甘肃食品研发与检测联合实验室,青海 西宁 810016;3.青海大学省部共建三江源生态与高原农牧业国家重点实验室,青海 西宁 810016)

摘 要:发酵技术广泛应用于食品生产。食用种子是除乳制品之外良好的发酵载体,发酵可以改变食用种子的营养活性成分、代谢产生新的活性物质且能够降低抗营养因子,可赋予食用种子及其制品更好的加工性质或者表现出降血糖、降血压、减脂、抑癌等生物活性价值,鉴于发酵可赋予可食用种子及其制品更优良的品质,该文综述发酵改性食用种子及其制品的相关应用研究,以期为利用发酵技术改性食用种子及其制品的研究开发提供参考。

关键词:发酵;食用种子;加工性质;活性成分;生物活性

发酵技术是一种古老的食品生物技术[1],通过微生物产生的内在有机催化剂将复杂的有机物质转化为简单的化合物[2],被广泛应用于食品工业,改善食品的营养价值、安全性、感官特性和功能特性[3]。根据发酵过程中的水分含量,将发酵分为固态发酵和液态发酵,根据发酵过程中涉及的微生物来源,有接种发酵和自然发酵[4]

乳糖不耐受、胆固醇、致敏乳蛋白和素食主义的趋势推动了非乳制品发酵载体的开发,食用种子在世界范围内广泛种植和消费,是能量、矿物质和维生素的极好来源,因此在不同的发酵载体中脱颖而出,在天然食品的营养和健康方面显示出巨大的潜力[5-6]。将发酵技术应用于食用种子及其制品可赋予或提高其加工性能或营养特性[2-3,7]。在发酵食用种子及其制品的研究应用中多采用接种发酵以获得稳定且优质的产品[8],乳酸菌和双歧杆菌是最常用于该类发酵的细菌,此外,枯草芽孢杆菌、真菌(霉菌)也常用于发酵食用种子及其制品[2,9-10]。为了更好地了解发酵技术对食用种子及其制品的影响,本文综述了发酵技术对食用种子及其制品改性的相关应用研究。

1 发酵对加工性质的影响

微生物利用碳水化合物产生气体、酸和酶,使可食用种子或其制品的淀粉理化特性发生了改变,影响其加工性质,进而使淀粉基食品在质构、口感和风味得到明显的改善[11-12]

发酵使得种子的淀粉结构和性质发生明显改变,这种改变对于每一种发酵后的淀粉不尽相同。经过发酵后的淀粉颗粒表面遭到侵蚀,淀粉的重均分子量下降,结晶层改变,造成与结晶度呈负相关的淀粉水解敏感性发生改变[11,13-14,15-16]。食用种子及其制品经发酵后其糊化特性也会发生改变,如玉米淀粉和糙米淀粉发酵后的糊化焓发生明显改变[16-17],自然发酵的小麦淀粉具有较低的峰值黏度和最终黏度[11],用植物乳杆菌发酵的高粱的凝胶化温度和回生温度降低,而峰值黏度、热糊黏度、破裂黏度和最终黏度增加[18],自然发酵后的高粱淀粉峰值黏度及回生值增加[13],天然酿酒酵母发酵的玉米淀粉糊化后表观黏度降低[15],金丝雀种子淀粉自然发酵后对溶胀、回生具有更强的抵抗力,发酵后的淀粉具有更好的黏度特征[14]。王旭东等[19]用黑曲霉发酵高粱后其峰值黏度、最低黏度、最终黏度和衰减值明显下降,回升值升高,糊化温度降低,且其水溶指数提高了6倍。

发酵能够提升可食用种子及其制品的食用品质。程鑫[17]将乳酸菌应用于糙米中,发酵后糙米的吸水性能提高,体积膨胀率增大,糙米饭硬度显著降低了29.63%,黏性显著升高了81.88%,使米粒之间黏结性更好,感官品质得到了显著提升。Xing等[20]将戊糖片球菌作为馒头制作的辅助培养物,可提高CO2产量,使得馒头硬度降低并且比容增加,提高了馒头的食用品质。将发酵麦麸添加至馒头原料中可有效改善加工特性,与未发酵的麸皮相比,添加发酵麦麸有效降低了未发酵麸皮对混合粉料的粉质和拉伸性能的不利影响,并增加了面团的黏弹性和面包的体积[21-22]

2 发酵对营养活性成分的影响

发酵食用种子及其制品具有多种多样的营养活性成分,例如天然酚类物质、氨基酸、维生素等,发酵被证明是一种有效强化可食用种子及其制品活性成分的方法。

2.1 可溶性蛋白、多肽及氨基酸类活性成分变化

在发酵过程中,微生物利用其营养成分产生蛋白酶将蛋白质水解,使其可溶性蛋白含量增加,释放出小肽和游离氨基酸,产生γ-氨基丁酸(γ-aminobutyric acid,GABA)。在 Zhang 等[23]、刘红艳[24]、Dai等[25]、Shi等[26]的研究报告中均表明发酵后基质中的可溶性蛋白含量明显上升,Koistinen 等[27]、Shi等[26]、Rizzello 等[28]的研究报告表明其小肽含量明显增加,Shi等[26]、Rizzello等[28]、Mok等[2]、DE Pasquale等[29]的研究报告中表明食用种子及其制品经过发酵后其氨基酸含量明显上升。发酵过程中形成的游离氨基酸有利于产GABA微生物代谢生成GABA。程鑫[17]用乳酸菌发酵糙米的研究结果表明糙米发酵后GABA的含量是原料糙米的3.02倍。Gan等[4]通过数据统计分析表明发酵是有效产生或提高GABA的途径。总之,发酵是一种处理可食用种子及其制品提升蛋白、多肽及氨基酸活性成分含量的有价值的生物处理策略。

2.2 酚类化合物

天然酚类物质是以可溶性和结合的形式存在于植物中。近年来研究表明发酵可以改变食用种子及其制品的酚类组成和分布。Bei等[30]、吴寒[31]、Ayyash 等[32-33]、Aprodu 等[34]、Dai等[25]、刘红艳[24]、Özkaya等[35]、Chen 等[36]、程鑫[17]、王家琛等[37]的研究报告中均表明经过发酵后基质中总酚含量明显提高且其酚类形式发生变化。大多数研究报告表明发酵增加酚类物质,但并不是所有的发酵都能够引起酚类化合物的增加,如Simwaka等[38]、Zieliński等[39]、CHIBUIKE 等[40]等发酵后样品中酚类物质含量下降。

发酵过程中微生物的代谢通常也会引起活性成分的转化,例如可将大豆异黄酮葡萄糖苷(如大豆苷元)转化为苷元(如大豆苷元)。Handa等[9]、Jeong等[41]研究发现微生物发酵能够转化大豆糖苷型黄酮,使得糖苷形式的黄酮含量降低,糖苷配基异黄酮(大豆苷元、黄豆黄素和染料木黄酮)的含量增加,从而提升大豆的营养品质。酰化石柱糖苷(acylated steryl glucosides,ASGs)已经证明比甾基葡萄糖苷(steryl glucosides,SGs)具有更强的生物活性价值,米糠经米曲霉发酵后3种SGs含量分别下降了约35%,与SGs相比,ASGs的含量在发酵过程中增加了1.5倍,发酵米糠具有更好的生物活性价值[42]

2.3 维生素

维生素是人体重要的必需营养素,食用种子是一些维生素良好的天然来源,发酵也会对维生素种类及含量产生影响。例如费氏丙酸杆菌可以合成活性维生素B12,经过7 d的发酵,有效提高了发酵基质的维生素 B12 的含量[43];Zieliński等[44]研究结果表明,液态发酵荞麦后显著增加了D-手性肌醇(维生素B的一种)的含量;Gabriele等[45]用酵母发酵3种菜豆可增加抗坏血酸含量;Aprodu等[34]研究结果表明,不同商品发酵剂对混合谷物面粉发酵时叶酸含量有所下降。

2.4 其它活性成分

在发酵食用种子及其制品中发现了许多其它的生物活性成分的产生或提高,例如纤维素或半纤维素、有机酸等。Xing等[20]发现与未发酵麦麸相比,发酵麦麸中可溶性膳食纤维含量显著提高;Spaggiari等[46]用鼠李糖乳杆菌发酵麦麸后可溶性阿拉伯木聚糖浓度是原来浓度的3倍;Özkaya等[35]发现发酵燕麦麸皮后发酵样品的可溶性、不溶性和总膳食纤维含量明显高于对照样品;用乳酸菌发酵可食用种子及其制品可产生乳酸;Gupta等[10]用乳酸菌发酵燕麦粉和Shi等[26]用乳酸菌固态发酵玉米和大豆的混合粉后均发现发酵产生了大量的乳酸;王梅等[47]用3种益生菌发酵剂固态发酵豆粕可显著提高其有机酸含量,提高豆粕的营养品质。

一般来说,发酵对可食用种子及其制品的各种营养因子都有不同程度的影响,这可能与微生物介导的生物合成或降解有关。鉴于这些营养活性成分对人体健康的益处,有望利用产生或提高活性成分的微生物来开发富含活性成分的产品。

3 发酵对抗营养因子的影响

发酵可以有效降解存在于植物的抗营养因子,例如植酸、单宁、大豆球蛋白等,有效提升可食用种子及其制品的营养特性和安全性。Rezaei等[21]、刘红艳[24]、Chibuike等[40]、Yildirim 等[48]、Gabriele 等[45]、Simwaka 等[38]、Spaggiari等[46]、DE Pasquale 等[29]等的研究报告中表明发酵能够明显降低发酵基质的植酸成分。Shi等[26]、Zhang等[23]研究发现发酵能够显著降低豆粕中的大豆球蛋白和β-伴大豆球蛋白,Simwaka等[38]、DE Pasquale等[29]、刘红艳[24]、Chibuike 等[40]等研究发现经过发酵后发酵基质中的单宁含量明显降低。DE Pasquale等[29]、张拓[49]发现发酵能够有效降解玉米烯酮。因此,微生物发酵技术成为有效去除抗营养因子的加工策略。

4 发酵对生物活性的影响

发酵后的食用种子通常含有更丰富的活性成分,这些活性成分使得发酵产品及其提取物具有多种生物活性,如抗氧化、抗高血压、抗癌和减脂等。

4.1 抗氧化作用

发酵可以影响食用种子及其制品中的活性成分,从而改变其抗氧化能力,发酵后食用种子及其制品提取物体外抗氧化活性见表1。

表1 发酵后食用种子及其制品提取物体外抗氧化活性
Table 1 Antioxidant activity extracted from edible seeds and their products after fermentation

注:—代表与同列上行内容一致。

发酵基质 发酵菌种 提取溶剂 发酵后抗氧化能力 参考文献羽扇豆/藜麦 罗伊氏乳杆菌 水 1,1-二苯基-2-三硝基苯肼(1,1-diphenyl-2-picrylhydrazyl,DPPH)、2,2-联氮-二(3-乙基-苯并噻唑-6-磺酸)二铵盐[2,2′-azinobis-(3-ethylbenzthiazoline-6-sulphonate),ABTS]自由基清除能力显著提高Ayyash等[32]小麦 — — ABTS+自由基清除能力提高,DPPH自由基清除能力略微下降 —小麦 灵芝 — DPPH自由基清除能力、·OH自由基能力、铁氰化钾还原力和超氧阴离子自由基清除能力均显著提高寇娟妮等[3]豆渣 枯草芽孢杆菌 乙醇 DPPH自由基清除能力增加了6.4倍 Mok等[2]燕麦 米根霉 & 乳酸菌 80%乙醇 DPPH自由基清除能力、铁离子还原力(ferric ion reducing antioxidant power,FRAP)均增强吴寒[31]混合面粉 乳酸菌混合剂 酸化甲醇 DPPH自由基清除能力增加 Aprodu等[34]荞麦粉 14种乳酸菌少孢根霉80%甲醇—6种乳酸菌发酵后ABTS+自由基清除能力增加10种乳酸菌发酵后,FRAP增加ABTS+自由基清除能力降低,FRAP增加Zieliński等[39]燕麦 红曲霉 & 枯草芽孢杆菌 — DPPH自由基和ABTS+自由基清除能力显著提高 Chen等[36]大麦 泡盛曲霉 甲醇 抗氧化活性、金属螯合活性、ABTS+自由基清除能力均明显提高 Sandhu等[1]6种谷物 双孢蘑菇 甲醇 DPPH自由基清除能力、还原力、超氧阴离子自由基清除能力、亚铁离子螯合能力均明显提高刘红艳[24]

如表1所示,种子及其制品发酵后,其提取物的体外抗氧化能力大多数会有明显地提高。在细胞试验和动物实验中也有此发现,如从发酵藜麦淀粉中提取纯化的小肽能使角质形成细胞NCTC2544,受到氧化应激后表现出抗氧化活性[28];对小鼠灌胃灵芝发酵小麦水提物,可以提高D-半乳糖致衰小鼠血清和肝脏中的抗氧化酶活力,提高小鼠对氧自由基的抵抗能力,降低氧自由基过氧化损伤,延缓D-半乳糖的致衰作用[3]。可见,发酵技术可以有效提升种子及其制品抗氧化能力。

4.2 降血压

研究表明,近年来一些发酵食用种子及其制品在体内外均有降压作用。血管紧张素转换酶(angiotensin-converting enzyme,ACE)在控制血压方面发挥着核心作用。Ruan等[50]发现发酵豆粕中肽含量和体外抑制ACE活性提高,发酵豆粕中的多肽导致自发性高血压大鼠在3 h时收缩压显著降低。全麦羽扇豆、藜麦和小麦经罗伊氏乳酸杆菌3种发酵谷物均有较好的ACE抑制作用[32]。双歧杆菌发酵的羽扇豆和藜麦也具有显著的ACE抑制活性[33]。枯草芽孢杆菌发酵的豆粕对ACE具有较强的抑制作用[25]

4.3 降血糖

微生物发酵过程改变可食用种子及其制品淀粉结构且产生活性成分,使得发酵产品可以抑制α-淀粉酶和α-葡萄糖苷酶的活性,具有降血糖的潜力。全麦羽扇豆、藜麦和小麦经罗伊氏乳酸杆菌发酵后3种发酵谷物对α-葡萄糖苷酶抑制活性增强,其中羽扇豆的抑制作用最强,且发酵藜麦具有较强的抑制α-淀粉酶活性[32]。双歧杆菌发酵的羽扇豆和藜麦对α-葡萄糖苷酶抑制作用显著增加[33]。小麦粉中添加10%~20%发酵大麦粉的挂面蒸煮与感官品质虽有所下降,但可降低面条的预测血糖生成指数,使其成为中血糖生成指数的食物[51]。用植物乳杆菌发酵大麦提取β-葡聚糖,与未发酵相比,发酵后的β-葡聚糖能更好抑制α-淀粉酶、α-葡萄糖苷酶和脂肪酶的活性以及胆固醇的吸附[6]。Lopes等[52]发现发酵增强了藜麦降低具有高水平简单碳水化合物饮食血糖生成指数的能力,在喂食补充有发酵藜麦日粮的大鼠中,食物摄入、血糖和脂质水平以及附睾脂肪组织的积累均有所降低,表明发酵的藜麦具有潜在的降血糖和减脂作用。

4.4 抑癌作用

天然酚类、多肽类、氨基酸类、多糖类等多种生物活性物质被认为是潜在的抑癌活性成分,发酵食用种子及其制品具有抑癌作用。全麦羽扇豆、藜麦和小麦经罗伊氏乳酸杆菌发酵后,3种发酵谷物对结肠癌细胞(Caco-2)和乳腺癌细胞(MCF-7)具有抑制增殖活性的作用[32]。双歧杆菌发酵的羽扇豆、藜麦、小麦对结肠癌细胞(Caco-2)和乳腺癌细胞(MCF-7)具有细胞毒性活性[33]。Xiao等[53]用植物乳杆菌Dy-1发酵大麦提取物可以通过调控细胞凋亡相关蛋白,以时间和剂量依赖性方式抑制癌细胞HT-29的增殖。Jo等[54]从发酵大麦中分离出的BF-E2-P多糖可以激活小鼠的先天免疫系统,抑制结肠26-M3.1癌细胞的转移。

4.5 减脂作用

研究结果表明发酵后的食用种子及其制品产品含有多种活性成分,还具有减脂功效。程珂等[55]发现用植物乳杆菌发酵大麦的提取物能显著降低秀丽隐杆线虫的脂肪沉积,而未发酵的大麦提取物则未见此效果,从发酵大麦中分离出浓度为16 μg/mL酚类化合物、480 μg/mL 蛋白质、480 μg/mL 总糖,分别能使秀丽线虫的脂肪沉积量下降39%、26%及12%,发酵大麦提取物能显著抑制秀丽线虫体内脂肪的积累,其中酚类化合物降低脂肪沉积的效果尤为显著。孙鑫娟等[56]发现用植物乳杆菌发酵大麦的β-葡聚糖和未发酵大麦β-葡聚糖均能显著提高线虫的运动行为能力,从而增加线虫的能量消耗,以减少线虫的体内脂肪沉积,在相同剂量时发酵的大麦β-葡聚糖的抑制效果优于未发酵大麦β-葡聚糖。Jo等[54]发现植物乳杆菌dy-1发酵大麦的提取物和酚类化合物能够明显抑制3T3-L1脂肪细胞的脂肪生成且增强褐变,而未发酵的大麦提取物则无此效果。Xiao等[57]发现发酵的大麦提取物可以降低高脂饮食诱导的肥胖SD大鼠的体重、血脂白色脂肪的质量和棕色脂肪细胞的大小,获得更多的肩胛棕色脂肪并促进线粒体中的脱氢酶活性,通过激活棕色脂肪产热,增加棕色脂肪质量和能耗的增加,降低了大鼠的肥胖。

4.6 其它生物活性

某些发酵食用种子及其制品的提取物具有胃肠道保护、提高免疫力等作用。Lim等[58]发现三重发酵大麦提取物通过加强机体抗氧化防御系统和抗炎作用对胃黏膜损伤的大鼠具有积极的胃保护作用。Kim等[59]发现从发酵的大麦中分离出的多糖可以增强巨噬细胞免疫活性。

5 结论与展望

发酵技术在改性食用种子方面具有很大的潜力,可以促进食用种子及其制品更加符合加工生产的需要或具有潜在的健康益处。食用种子作为饮食的重要来源,为机体提供大量的营养成分,发酵技术对食用种子及其制品的改性策略使得研究者可以更好地研究开发新型加工基质或健康产品。

目前国内对于发酵改性食用种子及其制品的研究还是停留在饲料加工层面。近年来,粗粮化饮食观念的普及使得研究者热衷于开发感官品质优良且更具健康益处的谷物产品,口感粗糙被人们广泛应用于饲料的可食用种子及其制品重新回到了人们的视野,发酵技术的引入使其加工品质得到了明显的改善且具有更好的营养价值。利用发酵技术改性食用种子及其制品,有利于资源的开发利用且提供合理的饮食导向,可推动食品产业的发展。

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Research Progress in the Fermentation Technology of Modified Edible Seeds and Their Products

WANG Xiao-yan1,SUN Pei-li1,JIAO Jie1,PU Ying1,CAO Xiao-hai1,2,WANG Shu-lin1,2,3*
(1.College of Agriculture and Animal Husbandry,Qinghai University,Xining 810016,Qinghai,China;2.United Laboratory of Food Research and Testing of Qinghai-Gansu Province,Xining 810016,Qinghai,China;3.State Key Laboratory of Plateau Ecology and Agriculture,Qinghai University,Xining 810016,Qinghai,China)

Abstract:Fermentation was widely used in food production.Edible seeds were suitable for fermentation in addition to dairy products.Fermentation can change the active nutritional components of the fermentation substrate,which can be metabolized to produce new active substances,reduce non-nutritional factors,and improve the processing properties of edible seeds and their products.Physiologically,the benefits of fermentation include reductions in blood sugar,blood pressure,and fat and suppression of cancer.Since fermentation can improve the quality of edible seeds and their products,this review could provide a reference for the research and development of fermentation strategies to modify edible seeds and their products.

Key words:fermentation;edible seeds;processing properties;active ingredients;biological activity

DOI:10.12161/j.issn.1005-6521.2021.18.029

基金项目:科技部科技助力经济2020重点专项(SQ2020YFF0420513)

作者简介:王晓燕(1995—),女(汉),硕士研究生,研究方向:食品加工与安全。

*通信作者:王树林(1970—),男,教授,博士,研究方向:青藏高原特色食品资源开发。

引文格式:

王晓燕,孙培利,焦捷,等.发酵技术对食用种子及其制品改性的研究进展[J].食品研究与开发,2021,42(18):197-203.

WANG Xiaoyan,SUN Peili,JIAO Jie,et al.Research Progress in the Fermentation Technology of Modified Edible Seeds and Their Products[J].Food Research and Development,2021,42(18):197-203.

加工编辑:姚骏

收稿日期:2020-09-18