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抗性淀粉防病保健功能研究進展

2023-03-26 10:49賴雙定劉炳霄楊林
糧食科技與經濟 2023年6期
關鍵詞:代謝保健

賴雙定 劉炳霄 楊林

摘要:膳食纖維因具有防病保健功效、能夠促進人類健康而日益受到廣泛關注??剐缘矸鄄粫恍∧c快速消化吸收,易被結腸中微生物菌群分解發酵,因此,現已成為新型膳食纖維的重要來源。除提供營養功能外,抗性淀粉還具有有益的生理調控作用,可以有效預防和緩解諸多疾病,具有巨大的開發價值和應用潛力。為了深入探究抗性淀粉的防病保健功效,文章綜述了抗性淀粉有效調控腸道疾病、高脂血癥、糖尿病與肥胖癥等的最新研究進展,分析了抗性淀粉代謝等分子作用機制,并展望了抗性淀粉防病保健應用的發展方向。

關鍵詞:抗性淀粉;防??;保??;代謝

中圖分類號:TS231 文獻標志碼:A DOI:10.16465/j.gste.cn431252ts.20230626

基金項目:國家重點研發計劃項目(2022YFF1300504)。

Research progress on disease prevention and health care function of resistant starch

Lai Shuangding, Liu Bingxiao, Yang Lin

( School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, Heilongjiang 150001 )

Abstract: Dietary fiber has been paid more and more attention because of its function of preventing disease and promoting human health. Resistant starch is not quickly digested and absorbed by the small intestine, and is easily decomposed and fermented by the microbial flora in the colon, so it has become an important source of new dietary fiber. In addition to providing nutritional function, resistant starch also has beneficial physiological regulation effects, can effectively prevent and alleviate many diseases, and has great development value and application potential. In order to further explore the efficacy of resistant starch in disease prevention and health care, this article reviewed the latest research progress on the effective regulation of resistant starch in intestinal diseases, hyperlipidemia, diabetes and obesity, analyzed the molecular mechanism of resistant starch metabolism, and prospected the development direction of resistant starch in disease prevention and health care application.

Key words: resistant starch, disease prevention, health and fitness, metabolism

抗性淀粉(resistant starch,RS)是種新型的膳食纖維成分,既具有不溶性膳食纖維的安全性,又具有可溶性膳食纖維的特性和優勢,經過腸道菌群發酵后能產生短鏈脂肪酸(short chain fatty acids,SCFAs)等發酵分解產物[1]。此外,RS具有飽腹感強、消化率低、血糖生成指數(glycemic index,GI)低等特點[2],能夠有效預防和控制腸道疾病、高脂血癥、糖尿病與肥胖癥等嚴重危害人類健康的慢性疾病。因此,作為淀粉的優化產品,RS因其優良的加工特性及重要的生理保健功能成為功能性食品領域的研究熱點[3]。

本文擬概述RS的相關內容,重點綜述RS在防病保健方面的功效,并探討其作用機制,以期為RS的精深研究及開發利用提供參考依據。

1 抗性淀粉的分類與理化性質

RS最初由Englyst等[4]發現,是指在健康人體內不被小腸消化分解的淀粉及其分解物的總稱。根據淀粉的消化速度和營養特性可將其分為三大類:快消化淀粉(rapidly digestible starch,RDS)、慢消化淀粉(slowly digestible starch,SDS)和RS。根據來源、結構特性和酶解性質等不同,研究者通常將RS分為以下五類:① 物理包埋淀粉(physically trapped starch,RS1)主要存在于部分研磨的谷物和豆類種子中,因其被蛋白質或細胞壁包裹,不能充分膨脹或分散,從而難以被淀粉酶接近[5];② 抗酶解的天然淀粉顆粒(resistant starch granules,RS2)主要存在于生馬鈴薯、青香蕉和高直鏈玉米淀粉中,具有高度致密性或特殊結晶結構,難以被酶解消化[6];③ 回生淀粉(retrograded starch,RS3)是指糊化的淀粉在冷卻或存儲過程中,分子重排結晶形成的高度致密的聚合物淀粉,不容易被淀粉酶水解[7];④ 化學改性淀粉(chemically modified starch,RS4)是指經化學改性引入新官能團或改變淀粉分子結構而產生的抗酶解淀粉[8];⑤ 直鏈淀粉—脂類復合物(amylose-lipid complexed starch,RS5)是淀粉與脂質相互作用形成的單螺旋復合物,具有高度的熱穩定性,且難以與淀粉酶結合[9]。

在大多數情況下,RS1和RS2作為天然淀粉,在食品加工過程中會失去對消化的抵抗力,而RS3、RS4與RS5的熱穩定性高,經蒸煮等高溫處理后仍能保持一定抗消化特性[10]。RS難溶于水,但可以在2 mol/L KOH或DMSO溶液中溶解。其平均聚合度為30~200,相對分子質量分布范圍為104~108,淀粉顆粒結晶結構穩定[2]。相比于傳統的膳食纖維,RS具有高耐熱性、低持水性與色白味淡等特點,這使得在處理過程中RS能夠提供良好的加工性,并改善最終產品的質地。

2 抗性淀粉的防病保健性

近年來,大量的動物和人體實驗證明,攝入RS可以有效改善動物和人體的代謝紊亂,預防或輔助治療多種慢性代謝疾病,包括腸道疾病、高脂血癥、糖尿病與肥胖癥等。

2.1 抗性淀粉與腸道疾病

RS具有抵抗小腸中淀粉酶消化的特性,在結腸被微生物發酵產生SCFAs,主要包括乙酸、丙酸和丁酸等。這些代謝產物可以通過多種機制發揮多重抗炎和抑癌等生理作用,包括調節腫瘤壞死因子α(tumor necrosis factor α,TNF-α)信號傳導、miRNA表達和氧化應激相關途徑等[11-12]。同時,SCFAs能作為組蛋白去乙?;福╤istone deacetylase,HDAC)抑制劑[13],并且還能夠抑制Wnt信號通路的活性[14]。此外,RS能減少氨等毒素的吸收[15],保護結腸細胞DNA免受膳食蛋白質引起的損傷[16-17]。這些作用有助于減少腸道功能失調,并降低結腸癌等疾病的患病風險。

RS能夠通過調節腸道微生物群落的組成和代謝產物來影響免疫功能,降低腸道疾病的發病率。Koay等[18]報道了喂食RS的小鼠腸道微生物群落代謝產物的種類和數量顯著增加,如吲哚-3-丙酸,并促進有益菌群異桿菌屬(Allobaculum)和雙歧桿菌屬(Bifidobacterium)等的生長。梁單[19]發現馬鈴薯RS可以增加益生菌乳酸桿菌屬(Lactobacillus)等菌屬豐度,促進SCFAs的產生,還能提高結腸緊密連接蛋白Occludin和ZO-1的表達,降低血清中的炎癥因子和脂多糖水平,從而維護腸道的屏障功能。Li等[20]報道了RS對腸道微生物群落結構的影響,發現其可以促進瘤胃球菌屬(Ruminococcus)等有益菌群的增殖,抑制腸球菌屬(Enterococcus)等有害菌群的生長。RS含量高的稻米可促進SCFAs大量合成,增加益生菌普雷沃氏菌(Prevotellaceae)和抗炎糞桿菌(Faecalibacterium)的豐度,并降低腸道微生物群落失衡標志菌變形桿菌(Proteobacteria)和巨單胞菌(Megamonas)的豐度,對腸黏膜具有抗炎和調節作用[21]。

RS還可以調節腸道免疫防御和炎癥反應,改變某些致癌基因或它們產物的表達,從而抑制結腸癌、結腸炎等疾病的發展。飼喂RS的結腸癌小鼠其總SCFAs、乙酸、丙酸、丁酸濃度明顯升高,同時凋亡酶Caspase-3的水平上調,結腸炎癥和氧化應激指標中的β-葡萄糖醛酸酶和丙二醛水平降低[22]。含有改性秈稻RS的飲食可以減少結腸癌小鼠體內隱窩異常病灶的數量,并促進抑癌基因(antigen presenting cell,APC)的表達,抑制癌基因(B-cell lymphoma-2,Bcl-2)的表達,上調凋亡蛋白Bax的作用,誘導早期結腸癌小鼠細胞凋亡[23]。Wang等[24]報道,RS飲食干預通過上調結腸癌小鼠體內真核起始因子(eukaryotic initiation factor 2α,elF2α)與內質網應激相關激酶(protein kinase RNA-like ER kinase,PERK)的表達水平,抑制致癌相關代表基因的表達,從而促進結腸腫瘤細胞的凋亡和自噬。為了探究RS對炎癥性腸病的影響,Valcheva等[25]通過結腸炎模型小鼠實驗證實,喂食RS的小鼠結腸分泌的炎癥因子IL-6和趨化因子CXCL1顯著降低,有效減輕結腸炎小鼠腸細胞損傷。Hartog等[26]發現含有RS的多種纖維混合物增加了抗炎因子IL-10的水平,并且增加了腸系膜淋巴結中調節性T細胞的相對數量,從而改善結腸炎模型小鼠的臨床癥狀。

2.2 抗性淀粉與高脂血癥

高脂血癥是由脂質代謝紊亂引起的代謝性疾病,也是導致肝病、心腦血管疾病的主要原因之一[27]。其主要表現是血液膽固醇(total cholesterol,TC)、甘油三酯(total glyceride,TG)和低密度脂蛋白膽固醇(low density lipoprotein cholesterol,LDL-C)升高,高密度脂蛋白膽固醇(high density lipoprotein cholesterol,HDL-C)降低[28]。RS可以作為飲食干預以多種方式參與調控機體脂質代謝。

富含RS的高粱食物能顯著降低糖尿病患者的空腹血糖和體重指數,同時降低TC、LDL-C和TG的水平[29]。李濤等[30]發現,紫山藥RS可有效減輕高脂血癥金黃地鼠內臟的脂肪質量,調節血脂指標,改善腸道菌群的失衡,進而緩解肝臟脂肪病變。

膽汁酸維持體內脂質代謝平衡,膽固醇是合成初級膽汁酸的原料。初級膽汁酸在腸道轉化為次級膽汁酸,然后大部分膽汁酸被肝臟重吸收利用,這一過程被稱為膽汁酸循環。研究[31-33]表明,RS可以通過調節腸道菌群的組成,改變機體循環膽汁酸的組成和代謝,促進膽固醇的分解形成膽汁酸,從而調節血脂。Lei等[34]發現,蓮子RS減緩了高脂血癥大鼠體重增加和肝指數升高,緩解了脂肪肝癥狀,抑制了肝臟對次級膽汁酸的重吸收,影響膽汁酸循環。Aribas等[35]研究發現,RS結合了高血脂癥大鼠中的次級膽汁酸,并促進其在糞便中排泄,從而改善了高脂血癥大鼠的血脂代謝。此外,Liu等[36]報道,蓮子RS和乳酸鈉復合物通過多種代謝途徑如亞油酸代謝、鞘脂代謝和甘油磷脂代謝等,協同調節高脂血癥大鼠血清氨基酸、磷脂和有機酸水平,從而改善血脂水平,降低脂肪肝疾病的風險。

RS飲食干預能通過發酵產生的SCFAs激活腺苷酸活化蛋白激酶(AMP-activated protein kinase,AMPK)的活性,進而顯著抑制肝臟中固醇調節元件結合蛋白(sterol regulatory element binding peptide-1,SREBP-1)的表達水平,激活下游過氧化物酶體增殖物激活受體α(peroxisome proliferator activated receptor α,PPARα),進而增強胰島素誘導基因1(insulin inducible gene-1,Insig-1)與胰島素誘導基因2(insulin inducible gene-2, Insig-2)的表達,抑制脂肪酸合成酶(fatty acid synthetase,FAS)與乙酰輔酶A羧化酶(acetyl coenzyme A carboxylase,ACC)等的表達,從而抑制脂質的積累和游離脂肪酸的合成[37-39]。Shang等[40]報道,在肥胖小鼠高脂飼料中添加RS與低聚果糖復合物,可以富集PPARα信號通路,上調膽固醇7α-羥化酶(cholesterol 7α hydroxylase,CYP7A1)基因表達,促使膽固醇加速轉化為膽汁酸。Xu等[41]研究發現,RS能提高肥胖大鼠體內抗氧化酶活性,改善肝臟脂代謝酶活性,同時顯著下調SREBP-1和膽固醇合成基因3-羥基-3-甲基戊二酰輔酶A還原酶(3-hydroxy-3-methylglutarylcoenzyme A reductase,HMGCR)的表達,上調脂質氧化基因過氧化物酶體?;o酶A氧化酶(peroxisomal acyl-coenzyme A oxidase,ACOX)與肝功能基因的表達。這些改變增強了脂質分解代謝,抑制了脂質的合成代謝,有效預防和緩解高脂血癥等脂質代謝異常疾病,如圖1所示。

2.3 抗性淀粉與糖尿病

根據國際糖尿病聯盟(IDF)的統計,2021年全球20~79歲糖尿病患病人數約為5.366億人,預計到2045年將上升至約7.832億人[42]。糖尿病是目前最嚴重和最常見的慢性疾病之一,飲食治療是其最為基礎的治療方法。

普通的食用淀粉在消化過程中會迅速轉化為葡萄糖,導致血糖急劇上升。RS具有低GI值和熱值,可以提高飽腹感,并延緩餐后血糖的上升,從而有效緩解和控制糖尿病患者的病情[43-44]。王蕾蕾等[45]發現相比于普通大米,食用高RS的大米能夠降低糖尿病患者餐后2 h血糖水平和空腹血糖水平。Strozyk等[46]發現,通過冷卻米飯產生的RS可以縮短1型糖尿病患者血糖達到峰值的時間,減少餐后血糖的增加,延遲的血糖峰值的出現,表明RS對血糖控制有益,可能更好地與短效胰島素類似物的最高活性相匹配。

研究[47]發現,與表面光滑的圓粒豌豆相比,表面帶褶皺的自然變異豌豆含有更多的RS,直接食用這種褶皺豌豆或以面粉的形式加入到食物中,能顯著降低血糖,減輕胰島素抵抗,降低患2型糖尿病的風險。Bindels等[48]報道,RS可以獨立于腸道菌群改善胰島素敏感性,降低無菌和常規小鼠中脂肪組織巨噬細胞標志物的基因表達。Karimi等[49]研究發現,2型糖尿病患者補充RS2可以顯著降低糖化血紅蛋白(glycated hemoglobin,HbA1c)和內毒素水平,降低餐后血糖和胰島素反應。RS發酵產物SCFAs能與G蛋白偶聯受體(G-protein coupled receptors,GPRs)GPCR41/43相互作用,誘導腸道產生胰高血糖素樣肽-1(glucagon-like peptide-1,GLP-1)和腸肽YY(peptides YY,PYY)等腸道激素,降低機體的體脂肪含量,提高胰島素敏感性,并保護胰腺β細胞的功能[50-52]。

RS主要通過調節胰島素信號轉導的磷脂酰肌醇-3-激酶/蛋白激酶B信號途徑(phosphatidylinositol-3-kinase/protein kinase B,PI3K/ Akt),調節下游底物受體和糖原合成相關酶的表達,從而調控血糖。具體而言,RS可以降低磷酸烯醇丙酮酸羧化激酶(phosphoenolpyruvate carboxy kinase,PEPCK)和葡萄糖-6-磷酸酶(glucose-6-phosphatase,G6Pase)的表達,抑制糖原異生的過程[53-54]。糖尿病模型大鼠攝入RS后,與糖原合成相關基因的表達上調,如糖原蛋白1(glycogenin 1,GYG1)和糖原合酶2(glycogen synthesis 2,GS2),而與糖異生相關基因的表達下調[37]。此外,還有研究[55-57]觀察到,攝入RS后胰腺十二指腸同源異型盒因子-1(pancreas/duodenum homeobox-1,PDX-1)、葡萄糖激酶(glucokinase,GK)、葡萄糖轉運蛋白2(glucose transporter 2,GLUT2)以及胰島素受體底物1(insulin receptor substrate 1,IRS1)和2(insulin receptor substrate 2,IRS2)的表達上調,改善了胰島素的敏感性??傊?,RS可以改善與胰島素分泌和血糖信號傳遞相關基因的表達,調節糖代謝,有助于緩解糖尿病癥狀,如圖2所示。

2.4 抗性淀粉與體重、肥胖控制

當攝入的熱量高于消耗的熱量時,會造成脂肪堆積,進而引起體重增加并導致肥胖?,F有研究[58-59]表明,RS具有促進脂質排出、延長飽腹感和減少熱量攝入的作用,從而有助于體重管理和減肥。Huang等[60]研究發現,與RS4和RS2相比,RS3具有更強的飽腹感效果,飽腹感與RS的溶脹能力呈正相關。胃中形成的RS凝膠可以導致胃持續擴張和胃排空延遲,從而通過減少食物攝入量、增加能量消耗等機制控制體重。經過物化特性的優化,RS殼寡糖復合物對高脂飲食大鼠具有減肥和降脂作用[61]。

厚壁菌門(Firmicutes)與擬桿菌門(Bacteroidetes)的比值稱為F/B值,據報道[62],較高F/B值與肥胖風險增加有關。膳食中RS水平的增加導致肥胖相關菌種豐度下降,降低F/B值,并恢復了瘦素敏感性,減緩脂肪組織重量和脂肪細胞大小的增加[63]。另有研究[64]表明,RS能上調血管生成素樣蛋白(angiopoietin-like protein 4,ANGPTL4)的表達,從而抑制胰脂肪酶的生成,顯著降低超重和肥胖受試者的體重和體脂,并改善腹內和皮下脂肪面積。

2.5 抗性淀粉的其他生理功能

除了上述的防病保健功能之外,RS還具有其他眾多生理活性功能。RS在結腸的發酵產生大量的SCFAs,對腸細胞起營養作用,并降低腸道內的pH值,這增加了礦物質的溶解度,提高了鈣、鐵、鎂等礦物質吸收利用[65-66]。Correa等[67]研究發現,攝入RS的大鼠,其骨礦物質和骨密度相關的標志物增加,這有助于維持骨骼的健康。此外,RS可加速卵巢切除小鼠盲腸中的發酵過程,降低破骨細胞因子RANKL的表達,從而緩解骨質流失[68]。研究人員[69-70]還發現,將RS加入到口服補液鹽(oral rehydration salt,ORS)中,能增強鈉的吸收,減少排泄物中液體的流失,提高ORS對急性腹瀉的療效。蓮子RS的飲食干預通過改善輔助性T細胞Th1/Th2失衡,降低卵清蛋白特異性免疫球蛋白和過敏相關細胞因子的血清濃度,從而緩解卵清蛋白誘導的食物過敏小鼠的不良癥狀[71]。相比可消化淀粉,RS可以減少膽固醇的合成來降低膽結石的發生率[72]。高RS飲食可以通過多種機制緩解慢性腎病癥狀,包括顯著降低慢性腎病大鼠的血清尿素和肌酐水平,減輕炎癥的程度等[73]。此外,Esgalhado等[74]報道,慢性腎病患者補充富含RS2的餅干可以顯著增加核因子E2相關因子2(nuclear factor erythroid E2 related factor 2,Nrf2)和醌氧化還原酶1(quinone oxidoreductase 1,NQO1)的表達,降低尿毒癥毒素和炎癥水平。

3 抗性淀粉的應用和發展前景

RS由于其潛在的生理功能、特殊的物理性質以及優良的加工性能,在食品、醫藥和保健品等領域發揮重要作用。

RS作為食品添加劑在食品工業中被廣泛應用。RS可作為功能性纖維添加到面包等食品中,對其感官品質和質構產生積極影響,使消費者在享受美味食品的同時,獲得健康和營養[75-76]。RS具有良好的黏度穩定性和流變特性,可以作為液體和固體飲料食品中的增稠劑使用,而不會影響其口感。添加羥丙基化淀粉這種RS4能夠改善魚糜制品的凝膠品質與蛋白構象[77]。此外,在油炸洋蔥條中添加RS可以改善油炸洋蔥條的含油量、硬度、斷裂性和脆度等性能,而且不會顯著改變感官屬性[78]。

RS還可以應用于生物活性載體和生物降解食用包裝膜的研發。采用以RS為壁材的微膠囊包埋技術可以建立食品中生物功能活性成分的靶向傳遞系統,有效解決生物功能活性物質在體內利用率低和穩定性差等問題[79]。直鏈淀粉-脂質復合物的含量對可食膜的物理、機械和阻隔特性有顯著影響,可以用于調節可食膜特性[80]。此外,RS的開發利用還聚焦在以其為主要原料來開發高品質的功能性保健品和藥品。

4 結論與展望

抗性淀粉作為一種藥食兩用的天然安全食品資源,具有優良的食品加工性能和重要的生理功能,對人體健康有益。同時,抗性淀粉還彌補了傳統膳食纖維的不足之處,為功能食品研究開辟了新的方向,并具有重要的工業應用價值。因此,抗性淀粉的研究和應用具有廣闊的前景和發展空間。研究已經證實抗性淀粉具有預防和緩解腸道疾病、高脂血癥、糖尿病與肥胖癥等疾癥的作用。隨著研究手段的不斷發展,越來越多關于抗性淀粉的健康益處將會被發現和關注。然而,抗性淀粉的防病保健效應缺乏標準化,受到抗性淀粉類型、來源、劑量和實驗對象、設計等因素的影響。目前,已經有抗性淀粉相關產品上市,但是抗性淀粉的功能性、營養性、制備及構造、定量分析以及在食品和保健品中的應用等方面仍需深入、系統化的研究。因此,需要進一步研究抗性淀粉的分子結構和功能,確定其在機體內的作用機制,并制定抗性淀粉相關標準,以發揮其在日常膳食中的營養與保健功能。

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