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为建立南极磷虾(Euphausia superba)蛋白肽纳滤脱盐工艺,以脱盐率和蛋白损失率为评价指标,通过单因素实验和正交实验对影响南极磷虾蛋白肽纳滤脱盐效果的主要因素(蛋白肽浓度、压力、循环次数)进行优化。结果显示,采用纳滤技术对南极磷虾蛋白肽进行脱盐处理的最佳工艺条件:蛋白肽浓度为3%、纳滤压力为1.2 MPa、循环次数3次,在该条件下,南极磷虾蛋白肽的脱盐率达到(86.35±2.11)%、蛋白损失率为(9.10±0.35)%。采用优化工艺获得的南极磷虾蛋白肽的盐分含量为(1.14±0.12)%,蛋白质含量为(92.73±2.29)%,相对分子质量主要分布于3000 Da以下,氨基酸组成合理且符合联合国粮农组织/世界卫生组织规定的标准。研究将为高品质南极磷虾蛋白肽产品开发提供技术支撑。 相似文献
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为了确定纳滤法浓缩红树莓色素的最佳工艺条件,以红树莓色素溶液为原料,选取截留分子量为300u的纳滤膜浓缩纯化红树莓色素。以红树莓色素浓缩度衡量纳滤效果。通过单因素试验确定了温度、压力、进料质量浓度、pH对纳滤效果的影响。在此基础上,以色素浓缩度为响应值,利用响应面优化法,通过部分因子试验和中心组合试验设计,对纳滤法浓缩红树莓色素的最佳工艺条件进行了研究。得到最优条件为,纳滤温度为30℃,压力为0.6MPa,进料花色苷质量浓度为10.94mg/L,pH为3.12,此时色素截留率为98.26%。动态试验显示,红树莓色素纳滤法浓缩后浓缩度可达3.996。因此,纳滤法浓缩纯化为红树莓色素提取后加工提供了便捷稳定可行的方法。 相似文献
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从工艺路线、处理工艺、工艺可行性、国内外实施案例及投资与运行成本5个方面对混凝沉淀—臭氧氧化法处理纳滤浓缩液工艺进行评价,以期为工程实施提供理论依据。 相似文献
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Beatriz Cancino-Madariaga Carlos Felipe Hurtado Rene Ruby 《Aquacultural Engineering》2011,45(3):103-108
Recirculation systems are becoming widely used in the aquaculture industry, where ammonium removal results are crucial for a proper performance considering its high toxicity on fish. The objective of this study was to assess the ammonium retention, when the transmembrane pressure (TMP) in nanofiltration (NF) and reverse osmosis (RO) membranes are changed. Two pH levels were tested: pH 5, where ammonium is as NH4+, and pH 7 which is an average of the most common range in aquaculture (pH 6-8). In this study a model solution of ammonium-water and commercial membranes of polyamide supplied by Alfa Laval (DSSHR98PP) and Dow (NF90, NF200 and NF270) were used, with a membrane area of 0.01018 m2. A critical TMP was determined, where the repulsive electrochemical forces at the active layer were exceeded by the transmembrane pressure, causing an irreversible decrease of the retention values. The maximum TMP values for NF and RO membranes were 16 bar and 24.5 bar, respectively. Ammonium retention at pH 7 was higher than pH 5 for all assessed membranes before the critical TMP was reached, with average values of 100, 99.7, 98.4 and 87.5% for membranes NF90, DSSHR98PP, NF200 and NF270, respectively. It may be concluded the ammonium retention mechanism in the studied membranes basically corresponds to an electrochemical mechanism, where pH and critical TMP influence the retention values of ammonium. 相似文献
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