Antioxidative effect of lotus seed and seedpod extracts

The antioxidative activity of 6 kinds of extracts including 80% ethanol, hexane, chloroform, ethyl acetate, butanol, and water from seeds and seedpods of lotus (Nelumbo nucifera Gaertner) were evaluated by determining DPPH and ABTS radical scavenging activities as well as ferric reducing ability of plasma (FRAP). DPPH and ABTS scavenging capacities of the ethyl acetate fraction of lotus seed (LS) were 94.6 and 91.9% and those of the water fraction of lotus seedpod (LSP) were 94.5 and 95.2% at 0.8 mg/mL. The ethyl acetate fraction of LS and the water fraction of LSP also showed high FRAP. The high antioxidant capacities of LS and LSP may be due to their flavonoid and proanthocyanidin contents. The evaluation of antioxidant effect in LS and LSP is a valuable purpose, particularly for finding an inexpensive source for natural antioxidants and functional food. The high antioxidant capacity of LSP water fraction could be available as natural additive in food.     

两种真姬菇不同溶剂提取物的抗氧化活性研究

研究两种真姬菇不同溶剂提取物的抗氧化活性和多酚含量。制备真姬菇粗提物、正己烷萃取物、乙酸乙酯萃取物、正丁醇萃取物与水萃取物,分析它们的抗氧化活性与测定它们的多酚含量。结果表明:闽真2号正己烷萃取物的总抗氧化能力最好,乙酸乙酯萃取物清除DPPH自由基能力最强,正丁醇萃取物清除ABTS自由基能力最强;闽真3号乙酸乙酯萃取物的总抗氧化能力、清除DPPH与ABTS自由基能力均最好。相关性分析结果表明,真姬菇多酚含量与DPPH自由基清除能力具有一定的相关性。综合考虑抗氧化活性与萃取率,正己烷萃取物与乙酸乙酯萃取物可被作为天然抗氧化剂应用于食品科学领域。     

无梗五加叶体外抗氧化活性研究

研究无梗五加叶及其不同部分的抗氧化活性,研究其作为食用天然抗氧化剂的可行性.采用DPPH·、ABTS·+自由基及还原性反应体系,利用分光光度法测定无梗五加叶总提液及其不同组分在不同浓度下的抗氧化能力和总酚含量.结果表明:无梗五加叶的不同部分对DPPH·、ABTS·+自由基均具有较强的清除能力,对Fe3+有较强的还原能力...     

Antioxidant Activity of Ripe and Unripe Pepino Fruit (Solanum muricatum Aiton)

Abstract: Ripe and unripe exotic pepino fruit were evaluated for antioxidant activity, total phenols, and flavonoid content. The antioxidant potency was investigated by employing various established in vitro systems, such as 1,1‐diphenyl‐2‐picrylhydrazyl (DPPH), 2–2′‐azinobis(3‐ethylbenthiazoline‐6‐sulphonic acid (ABTS), hydroxyl radical scavenging, reducing power, ferrous ion chelation, ferric reducing antioxidant power (FRAP), and lipid peroxidation. The EC₅₀ values of ripe ethanolic extract on DPPH radical, reducing power, ferrous ion chelation, ABTS radical, FRAP, hydroxyl radical, lipid peroxidation (brain), and lipid peroxidation (liver) were obtained to be 2.20, 2.81, <5.00, 34.06, 8.53, 1.30, 1.75, and 0.51 mg/mL, respectively. However, the EC₅₀ values for unripe fruit extract were noted to be 3.75, 3.40, 11.25, 40.12, 9.75, 0.80, 1.91, and 0.63 mg/mL, respectively. Ripe fruit exhibited the highest values of antioxidant activity in all the scavenging assays except for hydroxyl radical scavenging assay. Ripe pepino had higher total phenol and flavonoid content than unripe fruit. This study suggests that possible mechanism of the biological activities may be due to free radical scavenging and antioxidant characteristics, which may be due to the presence of polyphenols in the fruit extracts. Practical Application: The ripe and unripe pepino fruit have excellent antioxidant properties, so the results obtained in this study clearly indicate that pepino fruit has a significant potential to use as a natural antioxidant agent and possibly as a food supplement.     

酰基稳态化花色苷的制备及其热降解特性和抗氧化活性

食品级的肉桂酸甲酯为酰基供体,运用减压酶法,催化其与矢车菊素-3-O-葡萄糖苷（C3G）发生酰化反应,具有绿色安全、高效且酰化产物单一等优点。对酰化产物进行分离,并进行热稳定性和抗氧化性等性质的测定。结果表明：酰化转化率为80%;利用半制备高效液相色谱仪对酰化后的产物进行分离纯化,纯化后的酰化C3G纯度达98.3%;经质谱分析可知,酰化后产物为矢车菊素-3-(6-肉桂酰)-葡萄糖苷（C3(6C)G）。酰基化修饰使花色苷的脂溶性、热稳定性得到了明显改善。采用1,1-二苯基-2-三硝基苯肼（1,1-diphenyl-2-picrylhydrazyl,DPPH）自由基清除、2,2-氨基-二(3-乙基-苯并噻唑啉-6-磺酸)（2,2-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid,ABTS）阳离子自由基清除、铁离子还原/抗氧化能力法（ferric reducing and antioxidant power,FRAP）、羟自由基清除体外实验测定不同浓度下C3G、C3(6C)G和VC的抗氧化能力。与相同浓度的VC相比,除了在ABTS阳离子自由基清...     

高钙菜黄酮的分级分离各级分的抗氧化活性

以抗坏血酸和叔丁基羟基茴香醚做阳性对照,采用二苯代苦味肼基自由基(DPPH·)、羟自由基(·OH)、超氧阴离子自由基(O₂-·)、还原力、2,2-联氮-二(3-乙基-苯并噻唑-6-磺酸)二铵盐阳离子自由基(ABTS+·)和总抗体外抗氧化模型,主成分分析综合评价高钙菜总黄酮各级分(乙酸乙酯相、正丁醇相、氯仿相和水相)的抗氧化活性。结果显示,在各体外抗氧化活性指标的测定中,各萃取相的抗氧化活性均随着黄酮浓度增加呈现上升趋势,其中ABTS+·的清除能力最强,高达99.72%±0.10%,与抗坏血酸清除能力相近。乙酸乙酯相的·OH清除率、O₂-·清除率、总抗氧化FRAP值、还原力及ABTS+·清除率要显著优于其它各萃取相,氯仿相的DPPH·清除率显著优于其它萃取相。主成分分析综合评价显示,乙酸乙酯相抗氧化活性最佳。显色反应结合红外光谱分析,初步判定乙酸乙酯相和正丁醇相可能为黄酮醇类。高钙菜总黄酮具有较强的抗氧化活性,可作为良好的健康食品原料开发及利用。     

核桃(Juglandaceae)种仁、叶、花粉抗氧化活性及成分鉴定

为综合开发核桃生物资源,研究了7种不同溶剂提取的不同种类核桃种仁、叶及其花粉提取物的抗氧化活性,并鉴定其抗氧化成分。采用DPPH和ABTS+自由基清除能力以及FRAP还原能力评价其抗氧化活性,并测定总酚、总黄酮含量,采用高分辨质谱仪鉴定样品抗氧化活性成分。结果表明,供试7种溶剂中60%丙酮提取物抗氧化活性较高。山核桃叶的DPPH(IC₅₀=0.156 mg/mL)和ABTS+(IC₅₀=0.131 mg/mL)自由基清除能力及还原能力(62.17 mg V_C/g)较其他品种核桃叶强。‘西林3号’核桃不同部位抗氧化活性测定显示,DPPH和ABTS+自由基清除力及FRAP还原力顺序从强到弱为:内种皮 > 叶 > 花粉 > 带皮种仁 > 去皮种仁。利用LC-MS从‘西林3号’内种皮及其核桃叶、KT-J02核桃叶、山核桃叶等4个供试样品的60%丙酮提取物中共鉴定出17种抗氧化活性成分,其中酚类9种,黄酮类8种,槲皮素和汉黄芩素为4种供试样品共有成分。山核桃叶中鉴定出13种成分,其中4种仅存在与山核桃中,即没食子酸、3-咖啡酰奎宁酸、表儿茶素没食子酸酯和对香豆酸;‘西林3号’和KT-J02核桃叶分别有1种成分仅存在于其中,为没食子酸-4-O-β-D-吡喃葡萄糖和儿茶素。内种皮中鉴定出6种成分,鞣花酸仅存在于内种皮中。     

Effect of Extraction Techniques on Phenolic Content, Antioxidant and Antimicrobial Activity of Bauhinia purpurea: HPTLC Determination of Antioxidants

Bauhinia purpurea leaf was extracted by Soxhlet, ultrasonication and maceration extraction methods using ethanol (99.5%, v/v) to obtain Soxhlet (SBE), ultrasonicated (UBE) and macerated (MBE) B. purpurea leaf extract. The effects of different extracting methods on the polyphenolic content and antioxidant activities using 2,2-diphenyl-1-picrylhydrazyl (DPPH), 2,2-azinobis (3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt (ABTS), ferric-reducing antioxidant power (FRAP) and total antioxidant capacity (TAC) were investigated. Disc diffusion and broth dilution methods were also carried out to find the antibacterial activity of these extracts. Findings of this study showed that UBE possessed significant (P < 0.05) polyphenolic constituents followed by MBE and SBE. All the extracts exhibited good DPPH and ABTS radical scavenging as well as potential reducing ability in TAC and FRAP methods. UBE possessed significant (P < 0.05) radical scavenging activity and reducing ability followed by MBE and SBE. Even the results of antibacterial activity were similar to antioxidant activity, with UBE inhibiting most of the bacteria followed by MBE and SBE. All the extracts were subjected to thin layer chromatography (TLC) bioautography followed by high-performance TLC densitometric determination, and the results show that extraction using ultrasonication method yields the highest amount of antioxidant compounds among the three methods mentioned earlier. This study confirms ultrasonic extraction to be an ideal, simple and rapid method to obtain antioxidant- as well as antibacterial-enriched B. purpurea leaf extract. The HPTLC fingerprint profile can be used as a reference data for the standardisation of B. purpurea leaf.     

Antioxidant Activity of Various Solvent Fractions from Edible Brown Alga,Eisenia bicyclis and Its Active Compounds

In this study, we aimed to elucidate the antioxidant capacity of Eisenia bicyclis and evaluated its antioxidant activity using various assay systems such as 2,2‐diphenyl‐1‐picrylhydrazyl (DPPH) radical scavenging, 2,2‐azino‐bis (3‐ethylbenzthiazoline‐6‐sulfonic acid) (ABTS) radical scavenging, reducing power ability, and content of total polyphenol. Among all the performed experiments, the ethyl acetate fraction of E. bicyclis exhibited higher antioxidant activities. From this finding, isolation and purification were performed on the ethyl acetate fraction and identified dieckol and phlorofucofureoeckol‐A by spectroscopic analyses including FAB‐mass in the negative mode, ¹H NMR, ¹³C NMR, ¹H‐¹H COSY, HMQC, and HMBC spectra. Interestingly, ABTS radical scavenging activities of dieckol and phlorofucofuroeckol showed strong effects of 65.36% and 70.38% at a concentration of 50 μg/mL, respectively. DPPH radical scavenging and reducing power abilities were increased in a dose‐dependent manner at various concentrations. These results suggest that dieckol and phlorofucofuroeckol‐A of E. bicyclis may play an important role in protection from oxidative stress involving reactive oxygen species and may contribute to the development of new bio products, for example, a useful preservative to improve food quality and a drug for various oxidative damage‐associated diseases. Practical Application: The results suggest that dieckol and phlorofucofuroeckol‐A can be utilized as a natural source for potential application of antioxidant in food industry and drug for oxidative damage‐associated diseases.     

Riboflavin Phototransformation on the Changes of Antioxidant Capacities in Phenolic Compounds

Eight phenolic compounds including: p‐coumaric acid, vanillic acid, caffeic acid, chlorogenic acid, trolox, quercetin, curcumin, and resveratrol were treated with riboflavin (RF) photosensitization and in vitro antioxidant capacities of the mixtures were determined by 2,2‐diphenyl‐1‐picrylhydrazyl (DPPH), 2,2’ azino bis(3‐ethylbenzothiazoline‐6‐sulphonic acid) (ABTS), and ferric reducing antioxidant power (FRAP) assays. Mixtures containing p‐coumaric acid and vanillic acid under RF photosensitization showed increases in ferric ion reducing ability and radical scavenging activity of DPPH, whereas mixtures of other compounds had decreases in both radical scavenging ability and ferric reducing antioxidant power. Hydroxycoumaric acid and conjugated hydroxycoumaric and coumaric acids were tentatively identified from RF photosensitized p‐coumaric acid, whereas dimmers of vanillic acid were tentatively identified from RF photosensitized vanillic acid. RF photosensitization may be a useful method to enhance antioxidant properties like ferric ion reducing abilities of some selected phenolic compounds.     

蓝莓花、茎、叶酚类物质含量及抗氧化活性比较

比较蓝莓花、嫩茎、嫩叶及老叶总多酚、总黄酮、原花青素的含量,并研究其抗氧化性能差异。结果表明:嫩叶中总多酚含量最高,为43.77 mg GAE/g(以干质量计,下同),分别是花、嫩茎和老叶的3.45、1.42、1.12倍;老叶中总黄酮、原花青素含量最高,为68.01 mg RE/g、23.29 mg CAE/g,分别是花的2.57倍和4.61倍、嫩茎的1.79倍和1.23倍、嫩叶的1.03倍和1.98倍。抗氧化性能中,老叶的铁还原能力最大,其次是嫩茎和花,嫩叶较差;清除·OH的能力为嫩茎嫩叶花老叶;清除DPPH自由基能力和总抗氧化能力均为嫩茎嫩叶老叶花甲醇提取物,均高于对照品;蓝莓各部分提取物对DPPH自由基的清除能力最强,总抗氧化能力次之,清除·OH能力和铁还原能力较差。     

橄榄酚类提取物的抗氧化性能

为进一步开发利用橄榄中的酚类物质,文中通过测定橄榄酚类提取物的铁离子还原能力、亚铁离子螯合能力,及对2,2'-氨基-二(3-乙基-苯并噻唑啉-6-磺酸)自由基(ABTS+.)、1,1-二苯-2-苦基苯肼自由基(DPPH.)、羟基自由基(.OH)和超氧阴离子自由基(O2-.)的清除能力,以考察橄榄酚类提取物的体外抗氧化性能,并与食品抗氧化剂丁基羟基茴香醚(BHA)和Vc进行对比。结果表明:橄榄酚类提取物具有较好的体外抗氧化性能,其ABTS+.、DPPH.清除率分别高达99%和95%以上,.OH、O2-.清除率可达50%左右,铁离子还原力约1 700μmol/L Trolox,亚铁离子螯合率最高为14.9%。且提取物ABTS+.、DPPH.和.OH清除能力及铁离子还原能力均强于BHA和Vc,而O2-.清除能力强于BHA但弱于Vc。另外,橄榄酚类粗提物和纯化物相同浓度下的ABTS+.、DPPH.、.OH清除能力和铁离子还原能力相当(P>0.05),而其O2-.清除能力和亚铁离子螯合能力表现有所差异。     

Evaluation of antioxidant activities and total phenolic contents of typical malting barley varieties

Fourteen typical malting barley varieties from China were evaluated for their DPPH radical, ABTS radical cation and superoxide anion radical scavenging activities, reducing power, metal chelating activities, and total phenolic contents (TPC). All barley samples exhibited significant antioxidant activities determined by different assays, and contained significant levels of phenolic compounds. Gan4 and Wupi1 barley exhibited the highest DPPH radical scavenging activity, ABTS radical cation scavenging activity and reducing power. Gan4 and Humai16 barley showed the highest TPC, whereas the highest superoxide anion radical scavenging activity and metal chelating activity were found in Huaimai19 and Ken3 barley, respectively. The Pearson correlation analysis revealed that the TPC showed strong correlations with DPPH radical scavenging activity, ABTS radical cation scavenging activity, and reducing power (P < 0.01), whereas its correlations with superoxide anion radical scavenging activity and metal chelating activity were poor (P > 0.05). Moreover, DPPH radical scavenging activity, ABTS radical cation scavenging activity and reducing power were well positively correlated with each other (P < 0.01). Principal component analysis (PCA) was applied to understand the interrelationships among the measured antioxidant activity evaluation indices, and to gain an overview of the similarities and differences among the 14 barley varieties.     

辐照红景天乙醇提取物的抗氧化作用及美白作用研究

目的:探讨60Co-γ射线辐照处理对红景天乙醇提取物抗氧化及美白作用的影响。方法:本试验所用红景天经不同剂量(5、10、20、30 kGy)的60Co-γ射线辐照处理后,采用1,1-二苯基-2-三硝基苯肼(DPPH)自由基清除率、2,2'-联氨-(3-乙基苯并噻唑啉-6-磺酸)二氨盐(ABTS)自由基清除率及铁离子还原能力(FRAP)、酪氨酸酶抑制实验、小鼠B16黑色素瘤细胞实验,评价辐照红景天提取物的抗氧化活性及美白活性。结果:与未辐照组相比,辐照组红景天提取物的抗氧化活性及美白活性均增加,其中20 kGy辐照组红景天提取物效果最佳,清除DPPH自由基的IC₅₀值为3.75 μg/mL、清除ABTS自由基的IC₅₀值为44.88 μg/mL、铁离子还原能力FRAP值为(1.90±0.05) mmol/mg、抑制酪氨酸酶的IC₅₀值为244.10 μg/mL、能够有效降低小鼠黑色素瘤细胞中黑色素的合成,并在浓度为0.50%以下时无细胞毒性。结论:20 kGy的60Co-γ射线辐照处理红景天乙醇提取物的抗氧化活性最强,并具有良好的美白功效。     

黄色洋葱皮不同溶剂多酚提取物的总酚、总黄酮含量及抗氧化活性

以黄色洋葱皮为原料,分别利用70%甲醇、70%乙醇和70%丙酮作为提取溶剂进行多酚类物质提取。测定提取物中的总酚含量、总黄酮含量并研究其抗氧化活性(DPPH自由基清除能力、ABTS自由基清除能力以及铁还原能力)。研究结果显示:利用甲醇作为提取剂所得的多酚类物质提取率最高(12.35%),并且提取物中总酚和总黄酮含量最高,分别为83.17、34.31 mg/g。同时,甲醇提取物对DPPH自由基和ABTS自由基的半抑制浓度IC₅₀分别为0.059和0.031 mg/mL,低于抗坏血酸而高于乙醇提取物和丙酮提取物。     

响应面试验优化超声辅助提取连钱草多糖工艺及其体外抗氧化活性

通过中心复合试验优化超声辅助提取连钱草多糖的工艺,以1,1-二苯基-2-苦肼基（1,1-diphenyl-2-picrylhydrazyl,DPPH）自由基和2,2’-连氮基-双-（3-乙基苯并噻唑-6-磺酸）自由基（2,2’--azino-bis-(3-ethylbenzothiazoline-6-sulfonic acid) radical,ABTS＋•）清除能力、Fe2＋螯合力、铁离子还原抗氧化力（ferric reducingantioxidant power,FRAP）和N,N-二甲基-对苯二胺（N,N-dimethyl-p-phenylenediamine,DMPD）自由基清除能力为指标,研究连钱草多糖的体外抗氧化活性。结果表明,超声辅助提取连钱草多糖的最优工艺为pH 7.2、液固比32∶1（mL/g）、超声功率270 W、超声时间8 min,此条件下多糖提取率在4.95%～5.12%范围内。体外抗氧化活性结果显示,连钱草多糖DPPH自由基清除能力为（0.51±0.04）μmol Trolox/mg,ABTS＋•清除能力为（0.69±0.04）μmolTrolox/mg,Fe2＋螯合力为（0.51±0.29）μmol EDTA/mg,FRAP值为（3.45±0.03）μmol Trolox/mg,DMPD自由基清除能力为（0.17±0.01）μmol Trolox/mg。     

番茄果胶和半纤维素抗氧化活性分析

为了探究番茄细胞壁中不同类型果胶和半纤维素的抗氧化活性,利用水、EDTA、Na₂CO₃、4% KOH和24% KOH溶液分步提取,得到水溶性果胶(WSP)、离子结合型果胶(CSP)、共价结合型果胶(SSP)、松散结合型半纤维素(LH)和紧密结合型半纤维素(TH)五种组分,对各组分进行了氧自由基吸收能力(ORAC)、DPPH自由基(DPPH·)清除能力、ABTS自由基(ABTS+·)清除能力和铁离子还原能力(FRAP)的分析。结果表明,番茄WSP含量显著高于CSP和SSP,为1.05 mg GalUA/g FW,TH含量显著高于LH(p<0.05),为0.09 mg Glu/g FW。番茄不同类型果胶和半纤维素均具有一定的抗氧化活性。其中,CSP的ORAC、DPPH·清除能力和ABTS+·清除能力较强,综合抗氧化活性较高。在5 mg/mL时,CSP的ORAC值相当于76.4 μmol/L Trolox,DPPH·和ABTS+·的清除率分别达到61.0%和99.8%。而SSP、LH和TH具有较强的FRAP。相关性分析表明各组分与抗氧化活性密切相关。研究结果为番茄的综合加工利用和作为功能性食品添加成分的开发提供了理论根据。     

Evaluation Of Antioxidant Properties In Vitro of Plastein-Reaction-Stressed Soybean Protein Hydrolysate

Alcalase was used in the present study to carry out an enzymatic hydrolysis of soybean protein isolate and a plastein reaction of the prepared hydrolysate in vitro, aiming to investigate the influence of the plastein reaction on the antioxidant properties of the modified hydrolysate. Soybean protein hydrolysate was prepared in a degree of hydrolysis of 14.0%, exhibited a scavenging activity of 43.6% on ABTS radical in vitro, and thus was used as the substrate of the plastein reaction to prepare the plastein-reaction-stressed hydrolysate. Response surface methodology was applied to select suitable reaction conditions as follows: enzyme addition level 1037 U/g peptides, substrate concentration 29.7% (w/v), reaction temperature 20.3°C. The stressed hydrolysate showed the highest scavenging activity on ABTS radical (about 47.9%) or maximal reaction extent when reaction time was 6 h. Three stressed hydrolysates with different reaction extents were prepared and evaluated for other antioxidant activities. Compared to the original hydrolysate, the stressed hydrolysate with lower reaction extent exhibited a similar (P > 0.05) scavenging activity on DPPH (or superoxide) radical and reducing power, but a significant higher activity (P < 0.05) on hydroxyl radical. The stressed hydrolysate with the highest reaction extent behaved as these investigated antioxidant properties were significantly higher (P < 0.05) than the original hydrolysate except for scavenging activity on DPPH radical. The results of the present study highlight that the alcalase-catalyzed plastein reaction appears to be capable of improving antioxidant properties of soybean protein hydrolysate.     

Antioxidant and DNA protection activities of a glycoprotein isolated from a seaweed,Saccharina japonica

A glycoprotein with a molecular weight of ～10 kDa was purified from Saccharina japonica, and its antioxidant activity was evaluated using five different antioxidant assays. The highest antioxidant activities of the purified glycoprotein determined by DPPH, ABTS, SODA, SORS and FRAP assays were 85%, 95%, 94%, 72% and 97%, respectively. About 37% nitric oxide scavenging and 85% xanthine oxidase inhibition activities were also observed at a concentration of 5 mg mL^?1. The glycoprotein exhibited optimal activity levels of free radical scavenging at pH 7–9 and 40 °C. Antioxidant activity decreased when treated with ethylenediaminetetraacetic acid and metal ions. Moreover, its scavenging activity decreased when the glycoprotein was treated with deactivation agents such as pronase E or sodium periodate (NaIO₄), and it showed protective activity against DNA cleavage induced under oxidative conditions.     

海洋鱼蛋白低聚肽结构和抗氧化活性的体外消化稳定性

本研究通过体外模拟胃肠道消化海洋鱼蛋白低聚肽,运用高效凝胶过滤色谱、紫外全波长扫描、圆二色光谱表征其消化前后结构变化,测定其消化前后DPPH自由基清除率、ABTS自由基清除能力、铁离子还原能力(FRAP)及氧自由基吸收能力(ORAC)的变化,以探究模拟胃肠道消化对海洋鱼蛋白低聚肽结构及抗氧化活性的影响。分子量分布数据揭示了海洋鱼蛋白低聚肽中分子量为150～1000u的组分为其主要组成部分,所占比例最高可达88.39%;紫外全波长扫描、圆二色光谱扫描表明海洋鱼蛋白低聚肽对胃蛋白酶有很强的抗消化稳定性以及对胰蛋白酶有较好的抗消化稳定性。在浓度1～15 mg/mL范围内,海洋鱼蛋白低聚肽的DPPH自由基清除率与其浓度成正相关,最高为67.86%;ABTS自由基清除能力、FRAP值及ORAC值三个抗氧化指标均显示海洋鱼蛋白低聚肽在消化后其抗氧化活性均有一定程度的提高,其中ORAC值在先胃蛋白酶后胰蛋白酶消化后提高最显著(p0.01)。总之海洋鱼蛋白低聚肽的结构和抗氧化活性均具有抗消化稳定性。