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香榧Torreya granids ‘Merrillii’为中国南方特有的珍稀树种,其种仁富含不饱和脂肪酸(高达80%),尤其是富含裸子植物特有不饱和脂肪酸——金松酸[1],能预防动脉粥样硬化[2],改善肠道菌落[3]。然而,高不饱和脂肪酸的坚果易发生油脂酸败,即坚果中不饱和脂肪酸在储藏过程中受到温度、光照、氧化、水分等因素的影响,最终被氧化成小分子的脂肪酸[4]。油脂酸败可分为水解酸败和氧化酸败。水解酸败指不饱和脂肪酸经脂肪酶水解后产生大量的游离脂肪酸,使酸价、皂化值升高[5],碘价降低[6],易产生不良气味。游离脂肪酸则进一步被脂肪氧合酶(LOX)氧化生成氢过氧化物[7],过氧化值(POV)是反映初级氧化酸败程度的重要指标[8]。氢过氧化物等中间氧化产物很容易被裂解成醛、酮、酸类物质等含羰基的二级产物[9],羰基价升高[10],茴香胺值增加[11],导致油质发生改变。通常,完成后熟进程的香榧籽含水量较高,约33%[7]。因此,高含水量、高不饱和脂肪酸的香榧生籽在储藏过程极易氧化,油脂发生氧化酸败,严重影响其风味和营养价值,导致储藏期短,这已成为实现香榧周年供应的技术瓶颈。
大量研究表明:真空包装或充氮包装能有效地抑制核桃、吊瓜子、香榧等坚果储藏过程中的油脂氧化,延长其保质期[12−15]。然而,2007年中国颁发了“限塑令”,呼吁重复与减少使用塑料产品,因此,新型的生物基包装材料逐渐成为研究热点[16]。生物基膜按基质大分子类型可以分为多糖膜、蛋白质膜与脂肪膜[17−19],由于纯膜功能单一,机械性能与阻隔性能差,无抗菌功能等缺点,需要通过添加抗氧化剂等功能性材料改性成为多功能复合膜。如狄建兵[20]通过在大豆蛋白中添加抗氧化剂涂膜核桃坚果,发现复合膜可以很好地作用于脂肪酶与脂氧合酶,降低过氧化值,抑制了油脂的酸败。纳米合成技术的发展,使得纳米材料被越来越多应用于食品和农业领域,在可降解的生物基膜中加入具有抗菌性纳米材料[21],可以改善膜性能。通过水热法获得的金针菇碳点(CDs),加入到明胶-卡拉胶膜中,形成了具有抗氧化性的膜[22];在壳聚糖-明胶膜中添加了单宁酸和细菌纳米纤维素,可明显改善膜的机械性能[23]。
本课题组利用提取精油后的香榧假种皮残渣为材料,通过进一步水热法合成了CDs,利用酸水解法合成了纤维素纳米纤维(CNF),并在精油中加入活性剂进行高压均质得到了纳米精油乳液(EON),通过多种测定研制出最佳配比的G/10%CDs/3%CNF/EON纳米复合膜,即在鱼鳞明胶甘油液(FSG)中分别加入质量分数为10%的CDs溶液、3%的CNF凝胶和1 mL 质量分数为5%的EON[24]。目前,有关生物基膜对水果与肉类储藏的研究较多,然而,在坚果上的应用较少。因此,本研究通过设置直接涂膜和成膜袋装2种包装形式,通过Schaal烘箱法对样品进行加速氧化,测定各处理下储藏过程中香榧籽失质量率、酸价、碘值、皂化值、脂氧合酶活性、过氧化值、羰基价、茴香胺和硫代巴比妥酸的变化,旨在探索新型纳米复合膜在香榧籽储藏中的应用,延长储藏期。这不仅可为坚果包装乃至食品包装提供新思路,还可提升香榧副产品的附加值,实现香榧假种皮的高值化利用,缓解环境压力,对实现香榧产业的可持续发展具有现实的意义。
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香榧籽于2023年9月采自浙江农林大学潘母岗香榧基地。该基地于2016年采用培育了4 a的嫁接苗(砧木为2年生榧树Torreya granids,穗条为1年生香榧,嫁接后再培育4 a)造林,2016年开始结实。于2023年9月18日采摘假种皮开裂的香榧籽,去除假种皮后,放置于温度为(25±2) ℃和湿度为(90±2)%的定温定湿后熟库,放置15 d完成其后熟过程,取出储藏于4 ℃冰箱备用。
保鲜膜材料:①纳米复合膜液,即在20 mL FSG中分别加入质量分数为10 %的CDs溶液、3%的纤维素纳米纤维(CNF)凝胶和1 mL质量分数为 5%的EON;②塑料膜(PE),0.04 mm塑料膜;③纳米复合膜,即将①中获得的纳米复合膜液,在37 ℃鼓风箱中干燥24 h成膜。纳米复合膜各组分制备见表1。
表 1 纳米复合膜各组分的详细制备方法
Table 1. Detailed methods of nanocomposite membranes
材料 制备方法 鱼鳞明胶甘油溶液(FSG) ① 向40 g鱼鳞中加入300 mL蒸馏水煮沸3 h,使用真空抽滤机去除残渣后得鱼鳞明胶溶液;② 以体积比1.0:0.5加入甘油,磁力搅拌交联20 min,取20 mL倒入直径9 cm的平板中备用,即为鱼鳞明胶甘油溶液(FSG) 10%碳点(CDs) ① 将提取精油的香榧假种皮残渣磨粉,再经200目筛子;② 取2 g香榧假种皮粉末加入聚四氟乙烯反应釜中,加入30 mL超纯水,再在180 ℃下分别反应6 h,等待冷却至室温后,先用滤纸分离残渣,离心5 000 r·min﹣1后取上清液,再用0.22 μm的滤膜除去杂质,最后通过透析24 h去除大颗粒,得到黄色透明的CDs溶液;③ 再将CDs溶液按10%质量分数加入前期得到的明胶甘油溶液,即为FSG/10%CDs 纤维素纳米纤维(CNF)凝胶 ① 将香榧假种皮粉末加入到质量分数为4%氢氧化钠中,在80 ℃下加热机械搅拌4 h,去除半纤维素、果胶和淀粉,用pH 6.8磷酸缓冲液洗至中性;为了脱去木质素,用2%亚氯酸钠、pH 4.6的醋酸缓冲液漂白4 h,重复3次。漂白后的样品再过滤,用缓冲液洗至中性;接着用质量分数为65%硫酸酸水解,60 ℃加热和机械搅拌持续2 h,加入冷水停止反应,过滤掉多余的酸,使用pH 6.8磷酸缓冲液调节pH至中性,超声分散1 h,得到CNF凝胶。② 再将CNF凝胶以质量分数为3%加入到前期获得的FSG/10%CDs溶液中,搅拌使其分散均匀,即获得FSG/10%CDs/3%CNF溶液 纳米精油乳液(EON) ① 按共水蒸馏法提取假种皮的精油;② 在5 mL香榧精油中加入2.5 g的吐温80和92.5 g的去离子水,在高压均质器中混合20 min后获得纳米精油乳液(EON);③ 往FSG/10%CDs/3%CNF溶液中加入1 mL 5% EON -
为了进一步研究新研制的纳米复合膜的保鲜作用,采取直接涂膜和成膜袋装2种方式。具体操作如下:挑选形状、大小和颜色较一致的香榧籽均匀分为2份,分别进行以下2种处理:①纳米复合膜液涂膜处理(Coating),即将香榧坚果浸入制备的复合膜液,拿出晾干之后再浸入膜液1次,风干;将复合膜液换为水,作为对照组(ck);②纳米复合膜袋包装(Film),即将香榧坚果装入纳米复合膜包装袋;以香榧籽用塑料袋包装作为对比处理,简称为PE。每个处理3个重复,每个重复250 g香榧籽。
通过Schaal烘箱法对样品进行加速氧化:即所有的处理被放置于60 ℃烘箱储藏,每隔1周取样测定油脂品质各项指标。
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称量储藏前的香榧籽质量(W0),在储藏期间,每周定期测定香榧籽的质量(W1)。失质量率=(W0−W1)/ W0×100%。
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酸价和过氧化值的测定参照杨蕾等[25]方法和GB 5009.229—2016《食品安全国家标准 食品中酸价的测定》中的滴定法测定[25];碘值参照GB 5009.267—2020《食品安全国家标准 食品中碘的测定》中的氧化还原滴定法测定[26];皂化值参照GB/T 5534—2008《动植物油脂 皂化值的测定》测定[27];脂氧合酶参照夏宁等[28]的方法测定;羰基价参照GB 5009.230—2016《食品安全国家标准 食品中羰基价的测定》测定[29];茴香胺参照GB/T 24304—ISO 6885: 2016 Animal and Vegetable Fat and Oils; Determinatior of Anisidline Value测定[30];硫代巴比妥酸值参照GB/T 35252—2017《动植物油脂 硫代巴比妥酸值的测定 直播法》测定[31]。
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各项参数均采用SPSS 16.0进行数据处理,运用方差分析法(ANOVA)分析,利用SigmaPlot 15.0 版专业绘图和数据分析软件进行相关性分析及作图。利用主成分分析(PCA)分析不同储藏基同不同包装处理对香榧油脂品质的影响。
Effect of nanocomposite film on oil quality of Torreya grandis ‘Merrillii’ nuts during storage
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摘要:
目的 研究新型纳米复合膜包装香榧Torreya grandis ‘Merrillii’籽在储藏过程中油脂品质的变化规律,为开发香榧等其他坚果的新型包装材料提供理论依据。 方法 以提取精油后的香榧假种皮残渣和香榧精油为原料制备的纳米复合膜液为包装原材料,采用Schaal烘箱法加速香榧储藏期的氧化试验,设置2种包装形式[直接涂膜:对照(ck)和纳米复合膜液(Coating);成膜袋装:塑料袋包装(PE)和纳米复合膜袋包装(Film)],测定各处理下0~6周储藏过程中香榧籽失质量率、酸价、碘值、皂化值、脂氧合酶活性、过氧化值、羰基价、茴香胺和硫代巴比妥酸质量分数。 结果 ①储藏4~6周,Coating处理的香榧籽的碘值显著高于ck(P<0.05),且Film处理的香榧籽的碘值显著高于PE处理(P<0.05)。②储藏5~6周,Coating处理的香榧籽的脂氧化酶活性、过氧化值、羰基价和硫代巴比妥酸质量分数均显著低于ck(P<0.05),且Film处理的香榧籽的以上指标均显著低于PE处理。③PCA分析显示:储藏1~6周,Coating与Film处理的香榧籽之间无明显的分离,但它们与PE、ck之间则存在明显的分离。 结论 新型制备的纳米复合膜液无论是直接涂层还是成膜包装,均可显著延缓储藏香榧籽的油脂酸败,使其保持较好的油脂品质。图6参36 Abstract:Objective This study aims to study the changes of oil quality in nano-film packaged Torreya grandis ‘Merrillii’ nuts during storage, and provide theoretical basis for searching new packaging material. Method The nanocomposite film solution prepared from pseudoseed residue after essential oil extraction and its essential oil were used as packaging raw materials. The oxidation experiment of the nuts during storage (0−6 weeks) was conducted by Schaal oven method. Two packaging types were set up (direct coating: control, short for ck; nanocomposite film solution coating, short for Coating; film bagged: plastic bag, short for PE; nanocomposite film bag, short for Film). Result (1) During 4 to 6 week of storage time, the iodine value of the nuts with Coating was significantly higher than that of ck (P<0.05), but it of the nuts with Film was significantly lower than that of PE (P<0.05). (2) During 5 to 6 week of storage time, the lipid oxidase activity, peroxidation value, carbonyl value and thiolbarbituric acid content of the nuts with Coating were significantly higher than those of ck (P<0.05), and the above indicators of the nuts with Film were significantly lower than those of PE. (3) PCA analysis showed that there was no obvious separation between the nuts with Coating and Film, however, the two treatments clearly separated from PE and ck. Conclusion The newly prepared nanocomposite film solution, whether directly coating or film bagged can significantly delay the rancidity of the nuts, with better oil quality during storage. [ Ch, 6 fig. 36 ref.] -
表 1 纳米复合膜各组分的详细制备方法
Table 1. Detailed methods of nanocomposite membranes
材料 制备方法 鱼鳞明胶甘油溶液(FSG) ① 向40 g鱼鳞中加入300 mL蒸馏水煮沸3 h,使用真空抽滤机去除残渣后得鱼鳞明胶溶液;② 以体积比1.0:0.5加入甘油,磁力搅拌交联20 min,取20 mL倒入直径9 cm的平板中备用,即为鱼鳞明胶甘油溶液(FSG) 10%碳点(CDs) ① 将提取精油的香榧假种皮残渣磨粉,再经200目筛子;② 取2 g香榧假种皮粉末加入聚四氟乙烯反应釜中,加入30 mL超纯水,再在180 ℃下分别反应6 h,等待冷却至室温后,先用滤纸分离残渣,离心5 000 r·min﹣1后取上清液,再用0.22 μm的滤膜除去杂质,最后通过透析24 h去除大颗粒,得到黄色透明的CDs溶液;③ 再将CDs溶液按10%质量分数加入前期得到的明胶甘油溶液,即为FSG/10%CDs 纤维素纳米纤维(CNF)凝胶 ① 将香榧假种皮粉末加入到质量分数为4%氢氧化钠中,在80 ℃下加热机械搅拌4 h,去除半纤维素、果胶和淀粉,用pH 6.8磷酸缓冲液洗至中性;为了脱去木质素,用2%亚氯酸钠、pH 4.6的醋酸缓冲液漂白4 h,重复3次。漂白后的样品再过滤,用缓冲液洗至中性;接着用质量分数为65%硫酸酸水解,60 ℃加热和机械搅拌持续2 h,加入冷水停止反应,过滤掉多余的酸,使用pH 6.8磷酸缓冲液调节pH至中性,超声分散1 h,得到CNF凝胶。② 再将CNF凝胶以质量分数为3%加入到前期获得的FSG/10%CDs溶液中,搅拌使其分散均匀,即获得FSG/10%CDs/3%CNF溶液 纳米精油乳液(EON) ① 按共水蒸馏法提取假种皮的精油;② 在5 mL香榧精油中加入2.5 g的吐温80和92.5 g的去离子水,在高压均质器中混合20 min后获得纳米精油乳液(EON);③ 往FSG/10%CDs/3%CNF溶液中加入1 mL 5% EON -
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