2. 宁夏农林科学院畜牧兽医研究所, 银川 750002
2. Institute of Animal Husbandry and Veterinary Medicine, Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan 750002, China
南瓜籽都有食药两用的功效,其含有丰富的蛋白质、脂肪酸、维生素等对机体有益的营养物质[1]。许多学者对南瓜籽的化学成分和药理作用进行了大量研究,发现其具有驱虫、抗炎[2]、抗氧化、改善脱发[3]、抑制癌细胞生长[4]、预防和治疗糖尿病等功效[5]。我国南瓜种植范围广、产量高,利用方式主要以南瓜果肉和南瓜籽仁为主,其加工副产物利用率低。因此,本文就南瓜籽的营养特性、药理作用、产品应用研究概况进行综述,以期为其作为动物饲料和抗生素替代物的可行性提供理论依据。
1 南瓜籽的营养特性 1.1 蛋白质南瓜籽的蛋白质含量丰富,但不同品种之间含量差异较大。冯舒等[6]通过测定4种出口南瓜籽的营养成分,发现蛋白质含量在34.58%~42.00%,脱脂美洲南瓜籽的蛋白质含量可高达66.5%。此外,南瓜籽含有苏氨酸、丝氨酸、谷氨酸、甘氨酸、丙氨酸、缬氨酸、蛋氨酸、异亮氨酸、亮氨酸、苯丙氨酸、赖氨酸、组氨酸、精氨酸等17种氨基酸,总含量为30.03 g/100 g,在必需氨基酸组成比例上与人体所需必需氨基酸模式相似。其中赖氨酸、蛋氨酸和苏氨酸等限制性氨基酸含量较高,分别为1.405、0.739和1.480 g/100 g[7]。由此可见,南瓜籽蛋白质含量高、品质好,具有较好的饲料利用前景。
1.2 脂肪酸南瓜籽油不饱和脂肪酸含量高,脂肪酸之间组成比例合理,具有较高的利用价值。南瓜籽含有十几种脂肪酸,其主要脂肪酸为棕榈酸、亚油酸、油酸,约占90%;其中棕榈酸占15%[2],亚油酸含量在44.7%~55.5%,油酸含量在23.8%~33.1%。不饱和脂肪酸含量高于78.2%[8],单不饱和脂肪酸含量高于35%[9]。南瓜籽油不饱和脂肪酸含量与葵花籽油、橄榄油等接近,都在80%左右,还含有共轭亚油酸和花生四烯酸。
1.3 多糖南瓜多糖具有抗氧化、降三高(高血压、高血糖、高血脂)、抗肿瘤、抑菌等作用[10],南瓜籽多糖表面平整,具有不定型性。程龙[11]通过复合酶(木瓜蛋白酶+纤维素酶)法提取南瓜籽多糖,在提取时间43 min、提取温度60 ℃、酶添加量2.5%以及pH 6.0时,南瓜籽多糖的得率为3.22%。王丽波等[12]通过热水浸提法提取南瓜籽多糖,得率为2.18%,并初步分析出南瓜籽多糖由鼠李糖、阿拉伯糖、木糖、甘露糖、葡萄糖、半乳糖6种单糖组成,不含糖醛酸。Wang等[13]采用超声辅助提取,在最优的条件下,南瓜籽多糖的得率为2.29%。
1.4 维生素南瓜籽中含有维生素B1、维生素B2、维生素C、维生素E、泛酸等[14],其中含量最丰富的为维生素E。王璐等[15]研究发现,南瓜籽油中含量最高的是γ-生育酚(4 794.1~5 270.2 mg/kg),含量最低的是δ-生育三烯酚(1.3~2.4 mg/kg)。γ-生育酚抗氧化性较高,是机体高效的抗氧化剂,具有抗炎、预防肠癌的功效[16]。
1.5 矿物质南瓜籽中含有钙、镁、钾、钠、硫等常量矿物质元素,铁、铜、锌、硒、铬、锰等微量矿物质元素,其中钙、钠、镁、钾、铬和锌的含量较高[17-18]。这些矿物质元素在动物生命活动中具有重要作用,可维持细胞内外渗透压正常、神经肌肉细胞的兴奋性、细胞膜通透性和细胞正常功能的作用,也是机体细胞各种生化反应的催化剂[19-20]。
1.6 其他活性成分南瓜籽中还含有单宁、类胡萝卜素、水苏糖、棉子糖[21]、甾醇、角鲨烯[8]等其他活性成分。其中,单宁具有抗营养作用,但适宜的单宁添加量具有促生长、提高抗病力等作用[22]。南瓜籽甾醇可以提高机体抗氧化能力[23]。角鲨烯是一种重要的多不饱和三萜类物质,能参与机体多个生理过程,具有抗氧化、增强免疫力、防癌、抗菌抑菌、提高动物繁殖性能等功效[24-25]。
2 南瓜籽的生物学作用及其机制 2.1 驱虫南瓜籽作为一种驱虫药广泛用于各种家畜,起主要作用的物质为南瓜籽氨酸[26-27]。南瓜籽作为驱虫药使用,更多的是和槟榔搭配使用。槟榔中槟榔碱对绦虫头结和前段具有麻痹作用,南瓜籽对绦虫的中段和后段具有麻痹作用,两者具有协同驱虫作用,驱虫效果可达90%以上。谢贤良等[28]通过比较吡咯酮和槟榔+南瓜籽的驱虫效果发现,槟榔+南瓜籽作为驱虫药安全有效,且槟榔+南瓜籽比吡咯酮更适用于猪带绦虫的驱除。Feng等[29]通过用槟榔+南瓜籽成功治疗一例人患牛带绦虫病。李向春[30]报道,槟榔+南瓜籽合剂可治猪囊尾蚴病。南瓜籽单独使用,也具有良好的驱虫效果。兰祖全[31]将干南瓜籽研成粉末,拌于精料给羊饲喂,驱虫效果良好。研究发现,不同剂量的南瓜籽粉对猫体绦虫都有驱除效果,但2 g/kg为最佳剂量,病情较重时使用3 g/kg[32]。李献军[33]通过18种中药对离体猪蛔虫疗效的研究发现,南瓜籽的有效率为40%~60%。南瓜籽对血吸虫幼虫有抑制作用,可杀灭一部分的幼虫。高剂量南瓜籽可使成虫虫体萎缩、器官退化,对虫卵具有抑制作用[34]。由此可见,南瓜籽对于绦虫病的治疗效果较好。
2.2 止血、抗炎、促愈合南瓜籽中含有较高含量的β-谷甾醇。β-谷甾醇可以显著提高血管生成活性,促进成纤维细胞生成,促使伤口愈合止血[35-36]。Bardaa等[2]用生理盐水、药物、南瓜籽油对小鼠伤口创面愈合能力进行对比发现,经过一段时间,南瓜籽油组大鼠皮肤表面没有炎症细胞、并完全重新上皮化,效果好于药物组。徐雅琴等[37]研究表明,南瓜籽植物甾醇对金黄色葡萄球菌、大肠杆菌、枯草芽孢杆菌和沙门氏菌都具有很好的抑制作用,当质量浓度为3 mg/mL时,可完全抑制供试菌的生长。王丽波等[38]通过抑菌试验研究发现,南瓜籽蛋白Pw-1对9种供试菌均有抑制作用,其中对白色葡萄球菌、黄瓜枯萎病菌、枯草芽孢杆菌和金黄色葡萄球菌4个菌株有显著的抑制作用。
2.3 治疗前列腺疾病南瓜籽营养丰富,含有多种活性物质,具有抗前列腺增生的作用。陈田[39]研究发现,南瓜籽油甾醇可以显著降低前列腺增生大鼠的前列腺湿重和前列腺指数,减小前列腺组织,抑制细胞增生。李千会等[40]研究发现,南瓜籽醇提石油醚萃取相经硅胶柱层析氯仿∶甲醇(8 ∶ 2、7 ∶ 3)梯度洗脱物对小鼠前列腺增生活性有明显的抑制作用。Vahlensieck等[41]发现南瓜籽可以治疗男性前列腺增生。还有很多研究也都证实了这一点[42-44]。
2.4 抗氧化王培宇[18]研究发现,南瓜籽多肽可以提高超氧化物歧化酶(SOD)活性和谷胱甘肽(GSH)含量,致使细胞内过多活性氧被清除,缓解氧化应激和抑制细胞早衰。张宇等[23]通过南瓜籽甾醇对SD大鼠体内抗氧化作用研究发现,南瓜籽甾醇对SD大鼠抗氧化能力具有促进作用。王丽波等[12]通过体外抗氧化试验表明,南瓜籽多糖对一些自由基具有良好的清除效果。
2.5 降血糖、降胆固醇南瓜籽的降血糖机理有3个方面:其一为南瓜籽多糖发挥作用。南瓜籽多糖的降糖作用可能是通过刺激胰岛细胞分泌胰岛素,从而起到降血糖作用[45-46]。其二为南瓜籽油发挥作用。有研究发现,南瓜籽油可显著提高胰岛素含量,显著降低大鼠血糖水平,并改善耐糖量[47]。其三为南瓜籽蛋白发挥作用。南瓜籽蛋白含有丰富的精氨酸。有报道指出,2型糖尿病患者的胰脏β细胞完全不能受糖刺激而引起胰岛素分泌,但给予精氨酸后,这种缺乏现象很快消失,葡萄糖作用消失后,胰岛素会迅速分泌[48]。
南瓜籽含有大量不饱和脂肪酸,其中亚油酸可以降低低密度脂蛋白含量,提高高密度脂蛋白含量。高密度脂蛋白被认为是一种健康的胆固醇形式,它能将胆固醇从细胞内转移到肝脏中,从而使胆固醇被肝脏代谢,降低胆固醇含量[49]。
2.6 抗癌Medjakovic等[4]用南瓜籽提取物对前列腺癌细胞、乳腺癌细胞、结直肠腺癌细胞和良性前列腺增生组织的增生细胞进行细胞活力测试发现,南瓜籽提取物对癌细胞生长具有40%~50%的抑制作用。Chari等[50]通过南瓜籽提取物对预防和治疗大鼠1, 2-二甲基肼诱发的结肠癌的作用试验发现,南瓜籽提取物可以降低结肠癌大鼠异常隐窝病灶,降低癌症发生风险。还有研究表明南瓜籽提取物在乳腺癌预防和治疗中的具有潜在作用[51]。
3 南瓜籽产品及其应用研究目前南瓜籽仍然以焙炒鲜食为主,去仁后得到的南瓜籽壳、南瓜籽仁皮和南瓜籽壳外皮,其粗蛋白质及粗脂肪含量较高。除此之外,市面上流行的其他南瓜籽产品有南瓜籽粉、南瓜籽油、南瓜籽粕和南瓜籽蛋白。南瓜籽仁皮、南瓜籽壳和南瓜籽壳外皮的营养成分含量见表 1(由本实验室测定)。
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表 1 南瓜籽仁皮、南瓜籽壳和南瓜籽壳外皮的营养成分含量(干物质基础) Table 1 Nutrient contents of pumpkin seed rind, pumpkin seed shell and pumpkin seed scarfskin (DM basis) |
南瓜籽粉是南瓜籽经干燥粉碎后过细筛得到的[52]。南瓜籽粉在营养组成上和南瓜籽极为接近,同样有驱虫、抗氧化、降血糖等功效,具有广泛的应用,如生产具有保健功能的南瓜籽粉饮料、南瓜籽粉胶囊和速溶南瓜粉等产品[53]。
3.2 南瓜籽油南瓜籽油色泽呈红棕色、气味芳香,含有丰富的不饱和脂肪酸和生物活性物质,具有抗氧化、抗炎、免疫调节等作用,是公认的一种高品质食药两用的植物油[54]。南瓜籽真实含油量率大约为51%,黄文城等[55]通过比较发现,烘干南瓜籽出油率为47.75%,高于烘炒南瓜籽(41.67%)。朱英莲[56]通过溶剂浸提法在最优条件下得出南瓜籽出油率为47.64%。乔永月[57]研究表明,南瓜籽油可以提高机体内肌糖原和肝糖原含量,从而有效恢复运动员运动耐力以及糖代谢的能力,并具有一定的安全性。南瓜籽油在反刍动物中研究较少,主要集中在犊牛上,有研究表明南瓜籽油加入初乳中饲喂犊牛,可以提高犊牛平均日增重、血清总蛋白含量和肠道中消化酶活性[58]。
3.3 南瓜籽粕随着对南瓜籽油的需求增加,造成南瓜籽提油后的南瓜籽粕产量也不断增加。南瓜籽粕的蛋白质含量为53.0%~75.2%,高于其他常用饼粕,必需氨基酸占总氨基酸的31%,粗纤维和粗灰分也符合饲料标准中对其他饼粕的要求[59],并且南瓜籽粕不含对机体有害的物质,是一种安全的蛋白质资源。目前南瓜籽粕的应用有2个方面:其一为当作动物饲料使用。Murray等[60]通过用南瓜籽粕和菜籽油代替鱼粉和鱼油饲喂北极嘉鱼的试验发现,当南瓜籽粕添加量为12.5%时,获得的饲养效果与传统鱼粉、鱼油配方相近,并且成本更低。其二为南瓜籽粕的深加工。Radoc ^ aj等[61]利用南瓜籽粕制作了一种富含ω-3脂肪酸的面包抹酱。周红丽等[62]利用中性蛋白酶水解南瓜籽粕,制备得到血管紧张素转换酶(angiotensin-converting enzyme,ACE)抑制肽,该产品可用于治疗高血压。代弟[63]使用南瓜籽粕为原料开发酱油,得到了品质优良的酱油产品。张芬[64]使用碱溶酸沉法提取南瓜籽粕蛋白,在最佳条件为时间2 h,温度40 ℃,pH 10,料液比1 ∶ 400,得出南瓜籽粕蛋白提取率为88.87%,所提取的南瓜籽蛋白呈淡黄色疏松粉末。南瓜籽粕还可以用来制作可生物降解、对环境无污染、价格低并且可以防止食物脱水变质的可食用蛋白膜[65]。
4 结语综上所述,南瓜籽及其加工副产物营养丰富,具有多种药理活性,在医疗保健方面应用较多,但在动物生产中应用较少,南瓜籽添加量对动物生长性能的影响尚不明确。如果能将其作为动物饲料原料,利用其含有的生物活性成分发挥益生作用,研究其对动物生长发育的影响,其研究结果将对解决我国蛋白质饲料原料短缺、提高动物生产性能和健康状况具有重要的研究意义。同时,在全面禁抗背景下,利用其抗菌、抗氧化作用等功能作为替抗饲料的前景广阔。
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