黑木耳多糖对猪肉糜质构及氧化特性的影响

以丁基羟基茴香醚(butylated hydroxyanisole,BHA)和卡拉胶为对照,研究黑木耳多糖对猪肉糜的质构特性和氧化特性的影响。分别将0.6%、1%、3%的黑木耳多糖,0.2%的BHA和0.1%的卡拉胶添加到猪肉糜中,4℃冷藏9 d,测定其硬度、弹性、回复力、硫代巴比妥酸反应产物(thiobarbituric acid reactive substances,TBARS)值、总巯基含量及羰基含量的变化。结果表明:添加3%的黑木耳多糖可以显著降低猪肉糜的初始硬度(P<0.05),添加1%的黑木耳多糖可以延缓猪肉糜硬度的增加,但对弹性和回复力没有明显的影响;经过9 d的贮藏,添加黑木耳多糖的各组猪肉糜TBARS值均小于空白组(2.09 mg/kg),而总巯基含量则高于空白组,此外添加3%的黑木耳多糖可以较好地抑制羰基的产生,这种作用效果与0.2%的BHA相近。黑木耳多糖作为一种天然产物添加到猪肉糜制品中,可以改善肉糜的质构特性并起到一定的抗氧化作用,能够部分替代合成类抗氧化剂BHA。

粗毛纤孔菌三萜初级纯化及体外降血脂研究

为研究粗毛纤孔菌三萜类化合物的初级纯化工艺及其对体外降血脂功能影响,试验选用粗毛纤孔菌三萜粗提物为原料,采用大孔树脂法静-动态筛选最佳纯化条件,并考察纯化后三萜对体外结合胆酸盐降血脂能力的影响。结果表明,D-101树脂纯化效果最好,其动态纯化条件为:上柱流速0.25 mL/min,上样质量浓度2.0 mg/mL,pH值为6;洗脱流速1 mL/min,乙醇体积分数80%,洗脱体积4BV。在此条件下三萜纯化物纯度为35.4%,比粗提物提高5.36倍。体外胆酸盐结合实验说明,纯化前的结合量1.31±0.09μmol/100mg,纯化后的结合量为1.58±0.06μmol/100mg,分别是辛伐他汀的46.33%和58.4%。初步得出结论:粗毛纤孔菌三萜类化合物降血脂活性与其纯度呈正相关,纯化工艺能够提高粗毛纤孔菌三萜类化合物降血脂功能,本研究结果为开发新型高纯度降血脂药物提供科学依据。

Geomagnetic jerk extraction based on the covariance matrix

We normalize data from 43 Chinese observatories and select data from ten Chinese observatories with most continuous records to assess the secular variations(SVs)and geomagnetic jerks by calculating the deviations between annual observed and CHAOS-6 model monthly means.The variations in the north,east,and vertical eigendirections are studied by using the covariance matrix of the residuals,and we find that the vertical direction is strongly affected by magnetospheric ring currents.To obtain noise-free data,we rely on the covariance matrix of the residuals to remove the noise contributions from the largest eigenvalue or vectors owing to ring currents.Finally,we compare the data from the ten Chinese observatories to seven European observatories.Clearly,the covariance matrix method can simulate the SVs of Dst,the jerk of the northward component in 2014 and that of the eastward component in 2003.5 in China are highly agree with that of Vertically downward component in Europe,compare to CHAOS-6,covariance matrix method can show more details of SVs.

个性化康复护理对糖尿病肾病患者肾功能及生活质量影响

研究个性化康复护理用于糖尿病肾病的价值。方法:2020年6月~2020年11月本科接诊糖尿病肾病病患18例,随机均分2组。试验组采取个性化康复护理,对照组行常规护理。对比sf-36评分等指标。结果:针对血尿素氮和24h尿蛋白定量,研究组干预后依次是(6.82±0.57)mmol/L、(4.03±0.92)g/L,比对照组(8.36±0.69)mmol/L、(7.23±1.18)g/L低,P<0.05。针对sf-36评分,研究组干预后(89.16±3.24)分,比对照组(78.11±5.63)分高,P<0.05。结论:于糖尿病肾病中运用个性化康复护理,利于肾功能的改善,生活质量的提升。