Effect of Wheat Based Diet Supplemented with Xylanase on Blood Sugar and Total Protein in Serum of Geese

[Objective] The effects of wheat based diet supplemented with xylanase on blood sugar and total protein in serum of geese were studied. [ Method ] By using the randomized design of single factor, the 1-day-old healthy goslings were divided into 6 groups and fed with corn based diet, wheat based diet and wheat based diet supplemented with xylanase at different concentrations respectively, the contents of blood sugar and total protein in serum were determined. [ Result] The wheat based diet supplemented with xylanase could increase the blood sugar and total protein in serum of geese and wheat based diet supplemented with 0.2% xylanase generated the best effect, which was higher than those of corn based diet group. As for the concentration of protein in serum, wheat based diet supplemented with 0.2% xylanase was significantly different from corn based diet and wheat based diet. [ Conclusion] The wheat based diet supplemented with xylanase could enhance geese production.

Z-Scan technique: To measure the total protein and albumin in blood

Z-scan technique is an effective tool for measuring the optical nonlinearity of the materials. By using this technique the measurement was made for total protein and albumin. The nonlinear refractive index of the total protein and albumin were found to vary linearly with concentration. Hence by calculating the nonlinear refractive index it is possible to measure their concentration in the sample. The values measured thus are found in equivalence with conventional colorimetric method.

Effects of Cold Acclimation and CaCl_2 on Total Soluble Protein, CaM and Freezing Resistance of Populus tomentosa Seedlings

Populus tomentosa seedlings used for cold acclimation at -3℃ were pretreated with or without 10?mmol·L -1 CaCl 2, 3?mmol·L -1 of Ca 2+ chelator EGTA, 0 1?mmol·L -1 of Ca 2+ channel inhibitor LaCl 3,and 0 05?mmol·L -1 of CaM antagonist CPZ. The changes in the contents of total soluble protein and CaM, and freezing resistance in all pretreated seedlings in various periods ( viz: following cold acclimation, chilling stress and recovery) were investigated. Results showed that cold acclimation increased the contents of total soluble protein and CaM, and freezing resistance of seedlings, which could be strongly reduced by the pretreatments of EGTA CPZ and LaCl 3 Cold acclimation combined with CaCl 2 pretreatment enhanced the effect of cold acclimation on freezing resistance, and obviously increased the contents of total soluble protein and CaM, reduced the declining degree of the contents of total soluble protein and CaM caused by chilling stress as compared with cold acclimation, augmented the increase in the level of total soluble protein and CaM during the recovery periods. Further analysis found that an increase in total soluble protein content during cold acclimation with or without CaCl 2 pretreatment mainly resulted from the increase in content of heat stable protein in total soluble protein. It is suggested that Ca 2+ calmodulin may be involved in the synthesis of total soluble protein, and the induction of freezing resistance of seedlings.

Cold Acclimation-Induced Changes in Total Soluble Protein, RNA, DNA, RNase and Freezing Resistance in Populus tomentosa Cuttings

The changes in the contents of total soluble protein and RNA, the activity of RNase in leaves and branches of Populus tomentosa cuttings at various periods (viz: cold acclimation, deacclimation, chilling stress and the recovery after chilling stress), and the survival rate and the freezing resistance of cuttings during cold acclimation at -3℃ were investigated. Results showed that cold acclimation not only increased the contents of total soluble protein and RNA, the survival rates and the freezing resistance of cuttings, decreased the activity of RNase, but also reduced the declining degree of total soluble protein and RNA contents, and the increasing level of RNase caused by chilling stress as compared with the controls. In addition, cold acclimation augmented the increase in the level of total soluble protein and RNA, and facilitated the decrease of RNase during the recovery periods. Further analysis found that the DNA content of all treatments kept relative stability at various periods. The changes in total soluble protein, RNA and RNase were closely related to the freezing resistance of cuttings. It appears that the increase of RNA content caused by cold acclimation induced decrease of RNase activity may be involved in the accumulation of total soluble protein and the induction of freezing resistance of cuttings.

Elementary study of differential expression of total soluble proteins in different life phases of Porphyra yezoensis

Total soluble proteins of different life stages, filamentous sporophytes cultivated in high temperatures, and blade gametophytes harvested in different seasons, were identified by SDS-PAGE. The types and amounts of expressed proteins also varied amongst the samples. The fewest soluble proteins were present in filamentous sporophytes. There were more types and amounts of soluble protein in conchospores than in filamentous sporophytes, but fewer than in bulgy sporophytes. More types of protein were detected in filamentous sporophytes cultivated in high temperatures than in those growing in normal situations. The most types and amounts of protein were found in blade gametophytes in all samples. Blade gametophytes harvested last year and stored at -20 ℃ showed only minor differences in expression of proteins when compared with those harvested in different seasons.

THE PROTECTIVE EFFECTS OF THE TOTAL SAPONIN OF DIPSACUS ASPEROIDES ON THE APOPTOSIS OF HIPPOCAMPAL NEURONS INDUCED BY β-AMYLOID PROTEIN

Objective To investigate the effects of the total saponin of Dipsacus asperoides (tSDA) and ginsenoside Rb1 (GRb1) on the apoptosis of primary cultured hippocampal neurons induced by β-amyloid protein (Aβ). Methods Primary cultured hippocampal neurons, the cultures were pretreated with tSDA and GRb1 on 10d for 24 hours respectively. Then the cultures were treated with 35 μmol·L -1 Aβ25-35 for 24 hours, observed the changing of survival rate of neurons and the apoptosis of neurons with biochemical analysis combining immunofluorescent cytochemical double-staining technique. Results Hippocampal neurons were treated with 35 μmol·L -1 Aβ for 24 hours, and survival rate of neurons downed to 52.6%. When neurons were pretreated by tSDA and GRb1, survival rate of neurons increased 11% to 15%. The findings of immunofluorescent cytochemical double-staining indicated that apoptotic neurons were obviously more than that of the blank group, reaching 43.9%.When neurons were pretreated by tSDA and GRb1, apoptotic neurons were downed to 16.6%, 10.8% respectively. Conclusion tSDA had the same effects as GRb1, protecting the neurons, antagonizing neurotoxicity of Aβ, increasing survival rate of neurons, and reducing apoptotic neurons induced by Aβ.

Effects of Nitrogen Fertigation Rate on Protein Components in Grains and Processing Quality of Different Wheat Varieties

[Objective] This study aimed to explore the effects of nitrogen fertigation rate on the protein components in grains and processing quality of different wheat varieties. [Method] Under the condition of higher soil fertility, different amounts of N-fertilizer were applied in the plots, and then the contents of total protein and its components, percentage of the component content to total protein content as well as the processing quality of grains of two strong-gluten wheat varieties （Linyou145 and Zhengmai9023） and two weak-gluten wheat varieties （Ningmai9 and Baofeng949） were determined. [Result] The contents of total protein and globulin, gliadin and glutenin were improved significantly with the increase of the N-fertilizer amount; but the content of albumin did not show remarkable increase; in addition, the percentage of each protein component was relative stable and did not increase significantly. Increase in the amount of N-fertilizer improved the sedimentation value, wet gluten content, loaf volume and loaf score, decreased the volume weight of grain. [Conclusion] This study provideed theoretical support for high-quality wheat production.

亚硝酸盐对焦酚红法检测24 h尿液总蛋白的干扰分析

目的探讨亚硝酸盐对于焦酚红法检测24 h尿液总蛋白的干扰效应,并评估维生素C纠正干扰的可行性。方法根据美国临床和实验室标准协会(CLSI)EP7-A3文件,选取24 h尿液总蛋白定量结果为150 mg/L、500 mg/L和1000 mg/L的新鲜尿液标本作为对照样本,并配制含不同浓度亚硝酸钠的干扰物样本。利用配对差异实验确认亚硝酸盐的干扰作用,并通过剂量效应实验明确亚硝酸盐浓度与干扰程度的关系。在终浓度为200μg/mL亚硝酸钠存在的情况下,评估不同浓度维生素C纠正干扰的效果。同时收集61例亚硝酸盐阳性和40例亚硝酸盐阴性的临床标本,比较两组标本维生素C纠正前后的相对差值,评估其临床应用价值。结果配对差异实验中200μg/mL亚硝酸钠对150 mg/L和500 mg/L两个浓度的尿总蛋白测定分别存在-157.8%和-36.2%的相对干扰,显著大于1/2TEa(22%),而对于高浓度1000 mg/L的尿总蛋白虽存在-20.5%的负干扰,但在可接受范围内。剂量效应实验结果显示随着尿液中亚硝酸盐浓度的增加,尿总蛋白检测所受负干扰作用亦逐渐增大。在终浓度为200μg/mL亚硝酸钠存在的情况下,添加0.2 mg/mL的维生素C可分别将150 mg/L和500 mg/L的尿总蛋白纠正至148 mg/L(-1.1%)和402 mg/L(-19.5%),均处于可接受范围内。临床标本中亚硝酸盐阳性组通过维生素C纠正产生的相对差值显著高于亚硝酸盐阴性组(P<0.01)。结论亚硝酸盐对于焦酚红法检测尿液总蛋白存在负干扰,尤其是在尿总蛋白150 mg/L情况下,需引起临床实验室的关注。添加0.2 mg/mL维生素C可有效纠正低浓度尿总蛋白标本中亚硝酸盐的干扰作用,具有一定的临床应用价值。

The Role of C-Reactive Protein, Granulocyte Colony Stimulating Factor and Total Antioxidant Capacity in Diagnosis of Acute Appendicitis

Background and Aim: Despite the fact that acute appendicitis is the most common surgical emergency all around the world, its diagnosis is still based on clinical evaluation and accuracy of the diagnosis depending on experience. The aim of this study is to evaluate the role of inflammatory markers in diagnosis of acute appendicitis. Material and Method: The study includes 77 cases with histopathologically proven acute appendicitis and 17 control cases. Blood samples were obtained from all cases and C-reactive protein (CRP), Granulocyte Colony Stimulating Factor (G-CSF) and Total Antioxidant Capacity (TAC) were measured. Findings: In cases with acute appendicitis, CRP and G-CSF levels were found to be related to acute appendicitis;however, TAC was not affected by the disease process. Moreover, CRP and G-CSF levels were correlated with the disease severity. Conclusion: Both CRP and G-CSF can be used in diagnosis of acute appendicitis. Furthermore, increased CRP level can be a marker to show advanced cases. However, G-CSF is not an effective marker to show disease severity.

Determination of Proteins by Measuring Total Internal-reflected Resonance Light Scattering Signals on Water/Tetrachloromethane Interface with Evans Blue and Cetyltrimethylammonium Bromide

A sensitive and selective assay of proteins is proposed based on measuring the total internal-reflected resonance light scattering(TIR-RLS) signals produced on the water/tetrachloromethane(H_2O/CCl_4) interface. In an aqueous medium with pH value in the range of 3.29—3.78, electrostatic attraction occurs between the negatively charged Evans Blue(EB) and positively charged proteins, forming hydrophobic ion associates and resulting in EB-protein adsorption on H_2O/CCl_4 interface. The presence of cetyltrimethylammonium bromide prompts this adsorption, resulting in strongly enhanced TIR-RLS signals. The intensity of the enhanced TIR-RLS at 360—370 nm was found to be proportional to the concentration of proteins. For bovine serum albumin and human serum albumin, the linear range of detection is 0.07—1.2 μg/mL and the limits of detection are 6.68 and 6.30 ng/mL(3σ), respectively, while for lysozyme, the linear range of detection is 0.06—1.0 μg/mL and the limit of detection is 6.0 ng/mL(3σ). The content of the total albumin in a human urine sample could be directly determined by using the standard addition method with a percent recovery of 97.6%—104.1%, and the RSD ranging from 1.9% to 4.2%.

火麻仁中水溶性活性蛋白质与糖类成分的研究进展

火麻仁为药食同源中药,应用历史久远,含有丰富的火麻油、大麻素类、木脂素酰胺类、火麻蛋白、多糖等成分,具有润肠通便的功效,在食品和医药领域都表现出较好的开发前景。笔者通过查阅近10年火麻仁的相关文献报道,对其主要水溶性活性蛋白质与糖类的最新研究进行了分析整理,发现火麻仁蛋白是一种优质的植物蛋白,主要由天冬氨酸、精氨酸、赖氨酸等氨基酸构成,具有通便、抗疲劳、抗衰老、抗氧化等药理作用,可通过碱提(酸沉)法、盐析法、酶解法等方法提取纯化,毒理学研究证实其应用较为安全;火麻仁中水溶性总糖含量约为3%~6%,主要具有免疫调节及抗氧化作用,可通过微波辅助提取进行制备,但相关单糖组成、糖链连接等结构研究还未深入开展。

肝素结合蛋白、总胆红素和白细胞计数联合预测严重创伤合并脓毒症的效能评价

目的:评价肝素结合蛋白(HBP)联合脏器功能指标对严重创伤合并脓毒症患者预警诊断和预后预测效能评价研究。方法:回顾性分析2019年1月~2020年9月期间入住浙江大学医学院附属第二医院急诊医学科的多发伤并完成HBP检测患者184例,根据SEPSIS 3.0诊断标准将患者分为脓毒症组(n=89)和非脓毒症组(n=95),追踪患者临床结局分为死亡组(n=43)和非死亡组(n=141)。连续测定患者HBP水平,比较两组HBP峰值差异,评估其诊断脓毒症的效力,以HBP峰值的中位数为界值进一步分析其与临床预后相关性,评估HBP单独及联合总胆红素(TBil)及白细胞(WBC)评估预后的效力。结果:(1)脓毒症组(n=89)与非脓毒症组(n=95)HBP的峰值(71.7±68.6 vs 52.5±56.1)无显著差异(P=0.051)。(2)184例患者中HBP峰值与WBC计数呈正相关(r=0.244,P<0.01),与TBil水平呈正相关(r=0.241,P<0.01)。(3)TBil水平、WBC计数及PCT水平独立诊断脓毒症曲线下面积(AUC)分别是:0.618、0.631和0.718,三者联合AUC为0.684,诊断敏感度为60.7%,特异度为71.6%(P<0.05)。(4)死亡预后相关分析显示:高HBP水平组患者死亡率要显著高于低水平组(30.4%vs 16.3%,P<0.05);WBC计数值也是死亡组显著高于非死亡组(17.5±6.9 vs 12.8±4.7,P<0.01),尤其合并脓毒症者,该值有显著差异(P<0.01)。HBP峰值、TBil水平、WBC计数、SOFA评分及APACHE-II评分对预测脓毒症死亡预后的AUC分别是:0.618、0.603、0.719、0.823及0.811,HBP联合TBil及WBC评估脓毒症预后的AUC为0.750,评估的敏感度为74.4%,特异度为74.5%(P<0.05)。(5)三者联合评估在预测脓毒症预后效力上与人工评分差异无统计学意义(P>0.05)。结论:HBP、TBil及WBC三者联合用于评估多发伤患者发生脓毒症风险的预测效力较高,对于合并脓毒症的外伤患者死亡风险预测具有较高的临床指导价值。

Comparative analysis of bed density, total phenol content and protein expression pattern in <i>Posidonia oceanica</i>(L.) Delile

Posidonia oceanicameadows are experiencing a progressive decline, and monitoring their status is crucial for the maintenance of theseecosystems. We performed a comparativeanalysis of bed density, total phenol content and protein expression pattern to assess the conservation status ofPosidoniaplants from the S. Marinella (Rome, Italy) meadow. The total phenol content was inversely related to maximum beddensity, confirming the relationship betweenhigh phenol content and stressful conditions. In addition, protein expression pattern profilesshowed that the number of differentially expressed proteins was dramatically reduced in the latest years compared to previous analyses. Our results support the usefulness of integrating solid descriptors, such as phenol content, with novel biochemical/molecular approaches in the monitoring of meadows.

尿蛋白/肌酐比与24-h尿蛋白定量在肾小球疾病尿蛋白水平测量中的一致性评价

目的评价尿蛋白/肌酐比值(protein/creatinine ratio,PCR)与24-h尿蛋白定量(24-h urine total protein,24-h UTP)在肾小球疾病患者蛋白尿定量检测中的一致性。方法选取2024年3月至2024年7月在西安交通大学第二附属医院住院的急、慢性肾小球肾炎以及肾病综合征等肾小球疾病患者作为研究对象,收集患者的年龄、性别、原发病、尿量、血常规、肝肾功能、血脂等临床资料,并记录尿常规、晨尿PCR以及24-h UTP等数据。多元线性回归筛选可显著影响PCR和24-h UTP结果的指标,据其对患者进行分组,并应用Bland-Altman分析以及组内相关性系数(intraclass correlation efficient,ICC)分别评价各组中两种测量指标的一致性。结果本研究共纳入患者220例,其中男性129例,女性91例,平均年龄(53.21±17.68)岁,PCR与24-h UTP间存在显著正相关(Spearman相关系数为0.83,P<0.001)。多元线性回归提示,尿量及血清白蛋白(albumin,ALB)水平可影响24-h UTP结果,而PCR结果不受尿量的影响,但却受到估算肾小球滤过率(estimated glomerular filtration rate,eGFR)以及ALB的影响。Bland-Altman分析显示,在24-h尿量1500~2500 mL、eGFR在30~89 mL·(min·1.73 m^(2))^(-1),或者ALB≥30g/L的患者中,两个指标具有较好的一致性。应用ICC进一步对各组中两个指标的一致性进行了定量,提示血ALB水平和尿量可能是影响两个指标一致性的因素。结论尿PCR和24-h UTP两种蛋白尿检测指标尽管具有高度的相关性,但其一致性及互相可替代性则需要结合患者的尿量、血清白蛋白以及eGFR水平等来进行综合的判断。

生姜两种提取物的药效物质基础研究

目的 通过对比生姜水提和绞汁两种提取物药理作用和化学成分的差异,从而研究生姜的药效物质基础以及为指导生姜临床上的合理应用提供科学依据。方法 采用酵母致热的大鼠模型,比较生姜水提和绞汁两种提取物的解热作用差异;采用二甲苯致小鼠耳肿胀模型,比较生姜水提和绞汁两种提取物的抗炎作用差异;通过对比生姜水提和绞汁两种提取物对DPPH自由基清除能力的大小,从而比较其抗氧化作用的差异。采用高效液相色谱法,测定生姜水提和绞汁两种提取物中6-姜酚、8-姜酚和10-姜酚的含量;采用紫外分光光度法,测定生姜水提和绞汁两种提取物中总多糖的含量;采用BCA蛋白浓度检测法(bicinchoninic acid)测定生姜水提和绞汁两种提取物中总蛋白的含量。结果 生姜水提物对酵母致热的大鼠模型体温改善作用不明显(P>0.05),而生姜绞汁提取物能显著改善酵母致热的大鼠模型(P<0.05);生姜水提物对二甲苯导致小鼠耳肿胀的模型具有显著的改善作用(P<0.05),而生姜绞汁提取物的改善作用不明显(P>0.05);阳性对照药物维生素C、生姜水提物和生姜绞汁提取物对DPPH自由基清除率分别为79.68%、78.36%和76.52%;生姜水提物中的6-姜酚、8-姜酚和10-姜酚含量分别为0.259 6 mg/g, 0.027 18 mg/g和0.026 79 mg/g,生姜绞汁中的6-姜酚、8-姜酚和10-姜酚的含量分别为0.161 3 mg/g、0.020 82 mg/g和0.034 99 mg/g;生姜水提物和生姜绞汁提取物中总多糖含量分别为1.790 mg/g和1.390 mg/g;生姜水提物和生姜绞汁提取物中总蛋白含量分别为9.90 mg/g和7.840 mg/g。结论 生姜水提物的解热作用不及生姜绞汁提取物,但生姜水提物的抗炎作用要明显优于生姜绞汁提取物,生姜水提物和生姜绞汁提取物均具有明显的抗氧化作用。因此,生姜临床应用时,发挥其解热作用时应选用其绞汁提取物,发挥其抗炎作用时可选用其水提物,发挥其抗氧化作用时两种提取物均可。生姜水提物中6-姜酚、8-姜酚、总多糖和总蛋白的含量比生姜绞汁提取物相对较多,而10-姜酚的含量比生姜绞汁提取物相对较少,两种提取物化学成分含量的差异是其不同临床应用的物质基础。

山药总蛋白对高糖诱导的人脐静脉内皮细胞氧化应激的保护作用及机制研究

探究山药总蛋白对高浓度D-葡萄糖(High concentrations of D-glucose,HG)诱导的人脐静脉内皮细胞(Human umbilical vein endothelial cells,HUVECs)氧化应激损伤的保护作用及其机制。利用50 mmol/L HG建立HUVECs损伤模型。将HUVECs随机分为对照组、模型组、山药总蛋白低剂量组(0.5 mg/mL)以及山药总蛋白高剂量组(1 mg/mL),评估山药总蛋白对HG处理的HUVECs的细胞活力、细胞形态及血管生成能力的影响;检测细胞中活性氧(Reactive oxygen species,ROS)的水平和超氧化物歧化酶(Superoxide dismutase,SOD)、过氧化氢酶(Catalase,CAT)的活力;以及培养基上清液中一氧化氮(Nitric oxide,NO)、8-羟基脱氧鸟苷(8-Hydroxy deoxyguanosine,8-OHdG)、丙二醛(Malondialdehyde,MDA)、白介素-1β(Interleukin-1β,IL-1β)、白介素-6(Interleukin-6,IL-6)的水平;测定B细胞淋巴瘤2(Bcl-2)、Bcl-2相关X蛋白(Bax)、硫氧还蛋白相互作用蛋白(Txnip)、NOD样受体蛋白3(NLRP3)、半胱氨酸天冬氨酸蛋白水解酶剪切体-1(Cleaved caspase-1)和IL-1β蛋白的表达水平。结果显示,山药总蛋白能显著提高HG处理后的HUVECs的细胞活力(P<0.01),改善细胞凋亡形态,并显著升高SOD和CAT的活力(P<0.05或P<0.01)以及凋亡相关蛋白(Bcl-2/Bax)的比值、血管形成能力、NO分泌量。此外,山药总蛋白还显著降低了HUVECs的ROS、MDA、8-OHdG、IL-1β和IL-6的水平(P<0.05或P<0.01)及炎症相关蛋白(Txnip、NLRP3、cleaved Caspase-1、IL-1β)的表达水平(P<0.05或P<0.01),并且上述指标的变化均呈现明显的浓度依赖性。本研究结果表明,山药总蛋白可能通过抑制Txnip/NLRP3信号通路从而保护HUVECs拮抗HG诱导的氧化应激,恢复HUVECs内的氧化平衡,进一步减轻细胞的炎症反应。

真空预冷对采后娃娃菜流通及货架品质的影响

为优选娃娃菜真空预冷的处理条件,维持采后娃娃菜的新鲜品质,在分析不同真空预冷终温(0、2和4℃)和不同真空预冷终压(400、600、800和1000 Pa)对采后娃娃菜预冷效果的基础上,进行了二因素三水平的中心复合响应面试验。结果显示,与不经预冷处理的对照和终温0℃的预冷组相比,在终压600 Pa条件下,2~4℃的预冷终温处理可更好地维持采后娃娃菜的外观品质,抑制其呼吸速率和丙二醛(MDA)含量的升高。在终温2℃条件下,与不经预冷处理的对照和终压1000 Pa的预冷组相比,400~800 Pa的预冷终压处理可更好地维持采后娃娃菜的外观品质,抑制其呼吸速率及MDA含量的升高。进一步的中心复合响应面试验结果显示,采后娃娃菜的真空预冷最优条件为终温4.0℃、终压600 Pa,该真空预冷条件不仅可维持采后娃娃菜的较好品质,而且可使活性物质可溶性蛋白、总酚和抗坏血酸的含量分别提高18.78%、18.47%和33.23%。因此,适宜的真空预冷处理是一种极具潜力的商品化处理技术,能有效维持采后娃娃菜在流通及货架期间的良好品质。

依据EP9-A3评价血清总蛋白常规方法和参考方法的可比性

目的评价血清总蛋白常规方法与参考方法的一致性,旨在为临床提供准确结果。方法采用血清总蛋白参考方法和常规方法同时测量GBW09186~188、RELA22A、22B、18A、18B、17A、17B、40份单人份血清样本,参考EP9-A3,将两种方法检测结果进行比对;参考EP14-A3文件,对常规方法使用的校准品进行互换性分析。结果参考方法测量标准物质和比对样本的偏倚为-1.66%~0.51%,常规方法测量偏倚为-2.34%~-0.30%,参考方法偏倚均小于常规方法。Bland-Altman图所有数据均匀地分布在均值附近且大部分(41/43)在95%置信区间(CI)内,说明两种方法有良好的一致性。3种回归分析中45g/L医学决定水平处的偏倚大于临床可接受范围,其余医学决定水平处的偏倚均小于临床可接受范围。常规方法使用的校准品测量值和其预测值的偏倚分别为1.23%、-1.65%,2个校准品均超出95%CI,校准品无互换性。结论血清总蛋白常规方法存在系统误差,且在低值处的正确度略有偏差。

具有溯源性和互换性的总蛋白标准物质在常规系统中的应用

目的探讨具有溯源性和互换性的总蛋白标准物质在常规系统中的应用。方法采用TP参考方法和常规方法同时测量GBW09186~188、RELA 23A、23B、21B、20B,51份单人份血清样本,将常规系统中标准物质的理论值和实测值进行线性拟合,单人份血清样本测量值代入拟合方程得出标准物质校准后的结果,参考CLSI EP9-A3,将校准前后的结果与参考方法的测量结果进行比对。结果常规系统测量国际比对样本校准前后的偏倚范围分别为-1.88%~-1.05%、-0.43%~0.41%,经冰冻人血清总蛋白标准物质校准后比对样本的偏倚明显降低。Bland-Altman图型分析实测值与参考方法结果的偏倚范围-4.98%~-0.33%,均为负偏倚,常规系统存在系统误差。校准后的偏倚范围-3.59%~1.28%,平均偏倚-0.43%,接近零点,经标准物质校准可以改善系统误差。实测值的4种回归分析中45g/L医学决定水平处的预期偏倚均大于临床可接受范围,经冰冻人血清总蛋白标准物质校准后的预期偏倚均在临床可接受范围内。结论将具有溯源性和互换性的冰冻人血清总蛋白标准物质作为常规系统的校准品可以保证检测结果的准确性和可比性。

慢性肾功能衰竭腹膜透析患者发生肾性贫血的风险及其预测模型构建

目的探究慢性肾功能衰竭(CRF)腹膜透析患者发生肾性贫血的风险,并建立风险预测模型。方法回顾性分析2018年7月至2021年6月吉安市中心人民医院收治的106例行腹膜透析CRF患者的临床资料,根据肾性贫血发生情况分为肾性贫血组与未发生肾性贫血组,各53例。比较两组肾性贫血相关因子水平[红细胞计数(RBC)、血红蛋白(Hb)、白蛋白(Alb)、C反应蛋白(CRP)、转铁蛋白(TRF)、转铁蛋白饱和度(TSAT)、血清总铁结合力(TIBC)、不饱和铁结合力(UIBC)],Logistic回归分析腹膜透析患者发生肾性贫血的危险因素,建立预测模型并评估其预测效能。结果肾性贫血组RBC、Hb、Alb、CRP、TRF、TSAT、TIBC、UIBC水平均低于未发生肾性贫血组,差异有统计学意义(P<0.05)。Logistic回归分析显示,TRF、TIBC、UIBC是发生肾性贫血的危险因素(P<0.05),ROC曲线显示AUC分别为0.815、0.919和0.826。肾性贫血风险预测模型验证结果显示,74例患者TRF、TIBC、UIBC的准确度为85.1%、86.5%、89.2%。结论TRF、TIBC、UIBC是发生肾性贫血的危险因素,且风险预测模型对肾性贫血发生预测效能较好。