摘要
为提高蓝莓果酱的品质,以蓝莓鲜果为原料,测定花色苷、总酚含量和1,1-二苯基-2-三硝基苯肼(1,1-dipheny1-2-picryl-hydrazyl,DPPH)、2,2’-联氮基-双-(3-乙基苯并噻唑啉-6-磺酸)二铵盐(2,2’-amino-di(3-ethyl-benzothiazoline sulphonic acid-6)ammonium salt,ABTS)自由基清除能力在打浆、调配、灌装、杀菌等加工关键环节的变化。研究添加D-异抗坏血酸钠对蓝莓果酱功能性成分和抗氧化活性损失的抑制作用,测定蓝莓果酱贮藏期间花色苷、总酚含量和L*、a*、b*值的变化。结果显示:蓝莓果酱各加工关键环节,其总酚、花色苷含量逐渐下降,DPPH自由基、ABTS+·清除能力也逐渐减弱;添加质量分数0.5%的D-异抗坏血酸钠可减缓这些指标的下降;保温实验表明,添加D-异抗坏血酸钠的果酱褪色程度比未添加的果酱约降低了21.07%。由此可见,适当添加D-异抗坏血酸钠可提高蓝莓果酱的营养和形态品质稳定性,延长产品货架期。
In order to improve the quality of blueberry jam during its processing,changes in anthocyanin content,total phenol content and 1,1-dipheny1-2-picryl-hydrazyl(DPPH) and 2,2'-amino-di(3-ethyl-benzothiazoline sulphonic acid-6) ammonium salt(ABTS) radical scavenging activities of blueberry jam at different stages of processing such as pulping,formulation,filling and sterilization were detected.The effect of added sodium D-isoascorbate on the functional components of blueberry jam was studied as well as its inhibitory effect on the loss of antioxidant activity.Meanwhile,changes in anthocyanin content,total phenol content,and L*,a* and b* values were measured during storage.Anthocyanin content,total phenol content and antioxidant activity gradually decreased during the whole production process.This decrease was slowed down by addition of sodium D-isoascorbate.During incubation at constant temperature,the degree of fading was reduced by about 21.07% by adding sodium D-isoascorbate.Thus,addition of sodium D-isoascorbate can improve the nutritional quality and stability of blueberry jam and prolong its shelf life.
引文
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