Effect of Nitrogen Source on Biomass and Lipid Production of a Marine Microalga, <i>Nannochloropsis oceanica</i>IMET1

The effects of the nitrogen sources sodium nitrate (NaNO3) and urea (CH4N2O) on growth, lipid production, and fatty acid composition of Nannochloropsis oceanica IMET1 were investigated. Nitrogen source affected cell density, dry cell weight, and lipid production. Cells grown in the nitrate medium increased dry cell weight and lipid weight in comparison with cells grown in the urea medium. The composition of fatty acids varied with nitrogen sources. IMET1cultured in the nitrate medium mainly contained C18:2 (14.9%) and C16:0 (6.3%) fatty acids, while IMET1 in the urea medium mainly contained C22:0 (33.1%), C18:3 (8.6%), and C16:0 (6.8%). This study demonstrates that nitrogen source can strongly influence lipid production and composition of N. oceanica IMET1.

Lipid Production by <i>Rhodotorula glutinis</i>from Pulp and Paper Wastewater for Biodiesel Production

This study investigated the potential of oleaginous yeast Rhodotorula glutinis utilizing pulp and paper wastewater effluents as cultivation media for the sustainable production of microbial lipids as biodiesel feedstock. R. glutinis is oleaginous yeast, which has the ability to produce significant quantities of intercellular lipids in the form of triacylglycerols. Yeast lipids are a promising potential feedstock for biodiesel production due to similar fatty acid composition to plant oils. The effect of various carbon sources on biomass production, lipid accumulation, substrate utilization, and fatty acid composition using R. glutinis in the pulp and paper wastewater media was studied. The pulp and paper wastewater was supplemented with glucose, xylose, and glycerol as carbon sources under nitrogen-limited conditions. The maximum lipid productions of 1.3 - 2.9 g&bull;L–1, which corresponded to the intracellular lipid contents of 8% - 15% cell dry weight (CDW), were obtained under various carbon substrates. A kinetic study of the batch fermentation was performed in a 3 L aerobic batch fermenter to describe the cell growth, lipid accumulation, and substrate utilization process, and the kinetic parameter was estimated. The fatty acid profile of oleaginous yeast was rich in palmitic, oleic, and linoleic acids and comparable to vegetable oils. Thus, the results of this study indicated that pulp and paper wastewater could be used to produce lipids as biodiesel feedstock.

Improvement of microalgae lipid productivity and quality in an ion-exchange-membrane photobioreactor using real municipal wastewater

To improve the productivity and quality of microalgae-based biodiesel when using municipal wastewater(MW)as nutrients source,an ion-exchange-membrane photobioreactor(IEM-PBR)was used in this study to eliminate the negative effects of pollutants in MW on microalgae Chlorella vulgaris and Scenedesmus obliquus.In the IEM-PBR,the real MW and microalgae cultures were separated in two chambers by the ion-exchange-membranes(IEMs).Nutrients(N,P,etc.)in the MW permeated into microalgae cultures through the IEMs,while pollutants(suspended solids,competitors,etc.)in the MW could hardly permeate into microalgae cultures.As a result,the lipid productivity in the IEM-PBR was improved to 85.7 mg/(L·d)for C.vulgaris and 111.8 mg/(L·d)for S.obliquus,which was slightly higher than that in the traditional photobioreactor(T-PBR)with real MW after centrifugation(82.5 mg/(L·d)for C.vulgaris and 105.8 mg/(L·d)for S.obliquus),but much higher than that in the T-PBR with untreated MW and primary MW(with lipid productivity of 20-30 mg/(L·d)).Besides,the lipid quality obtained in the IEM-PBR had higher proportion of cetane number(ca.60%)and lower linolenic acid content(ca.8%),which showed a superior quality in the IEM-PBR to that in the T-PBR.It demonstrated that the IEM-PBR is an effective approach to improve the productivity and quality of microalgae biodiesel.

Comparative study on cultivation of microalgae for nutrient removal and lipid production in different artificial wastewaters

Wastewater contains high concentration of nutrients,like nitrogen and phosphorus,which have been identified as the main reasons for water eutrophication and serious ecological issues.Therefore,cultivating a tolerant and adaptive microalgae strain in wastewater is considered as a promising approach for sustainable biomass/lipid production.The potential usages of Desmodesmus sp.for biomass and lipid production within different artificial wastewater(AW)were investigated and the removal efficiencies of nutrient were compared.The maximum removal rate of chemical oxygen demand,ammonia nitrogen,nitrate nitrogen and phosphate were 272 mg/(L·d),14.021 mg/(L·d),7.774 mg/(L·d)and 3.347 mg/(L·d),respectively in AW2,AW3,AW5 and AW2.Maximum biomass(1.159 g/L)and lipid(280 mg/L)productions were observed in AW5,while the highest lipid content achieved was 37.42%in AW1.Fatty acid analysis showed that lipids extracted from AW-cultivated Desmodesmus sp.contained 59.57%-77.79%polyunsaturated fatty acids(30.6%-44.47%was linoleic acid).

Phase-feeding strategy for Chlorella vulgaris to enhance biomass and lipid productivity

A phase-feeding strategy of nutrients based on requirements of Chlorella vulgaris in different physiological phases was examined to maximize the biomass and lipid productivity.This strategy includes reduction of duration in adaption phase(stage-I),enhancement of biomass in growth phase(stage-II)and improvement of lipid productivity in stationary phase(stage-III).The duration of microalgae in adaption phase was reduced from 52 h to 34 h at nitrogen and phosphorus feeding rates of 5.11 mg/(L·d)and 0.54 mg/(L·d),whereas the maximum biomass concentration during growth phase was improved to(4.03±0.25)g/L at nitrogen and phosphorus feeding rates of 20.04 mg/(L·d)and 4.21 mg/(L·d).In stationary and decline phases,a maximum lipid productivity of 132.30 mg/(L·d)was achieved when nutrients supply was stopped at 128 h,which was 28.86 mg/(L·d)higher than that when nutrients supply was stopped at 104 h.This multi-phase cultivation could be a promising strategy for simultaneous enhancement of microalgae biomass and lipid productivity.

Effect of Nitrogen and Phosphorus Starvations on <i>Chlorella vulgaris</i>Lipids Productivity and Quality under Different Trophic Regimens for Biodiesel Production

In this work the effects of nutrients starvations on Chlorella vulgaris were investigated in different trophic regimens. For all the tested conditions, the cellular response to nutrient starvation and trophic regimen was evaluated on specific growth rate, biomass and lipids productivity, lipids content and quality. These parameters are all crucial for microalgae biodiesel production, but in literature the lipids quality, in terms of polar and nonpolar lipids, is often neglected. Thus the typical high content of polar lipids, a class of molecules that negatively affects the biodiesel production process, of microalgae crude oil is generally not analyzed. In the tested conditions the triggering effect of nitrogen starvation on total lipids productivity is confirmed only in autotrophic regimen, while in mixotrophic and heterotrophic conditions the total lipids productivity is reduced, as a consequence of the lowered biomass productivity, but with an evident compositional shift towards nonpolar lipids production (from 0.5 mg/Ld to 41.6 mg/Ld in mixotrophic regimen). Nitrogen and phosphorus co-starvation induced the highest nonpolar lipids productivity in all trophic regimens. Maximum nonpolar lipids productivity was obtained in nitrogen limited and phosphorus deprived condition during mixotrophic growth, equal to 118.2 mg/Ld, representing the 80% of produced lipids. On the basis of the obtained results, the possibility of a short pre-harvesting cultural step to maximize the nonpolar lipids yield of the crop could be envisaged.

Lipid Accumulation Product: Reliable Marker for Cardiovascular Risk Detection?

The Lipid Accumulation Product (LAP) is a clinical marker of visceral obesity and has been proposed as a simple, inexpensive, and accurate tool to estimate cardiovascular risk and mortality. The aim of this study was to verify the association of LAP with anthropometric, biochemical, visceral adiposity index and IR in adults and the elderly. This single cross-section center clinical study, with experimental, analytical, primary, and observational design, included 210 participants. Anthropometric (Body Mass Index (BMI), Waist Circumference (WC), and Neck Circumference (NC)), LAP, Visceral Adipose Index (VAI), and biochemical parameters (fasting glycemia, insulinemia (to calculate the Homa-IR index), total cholesterol, LDL-c, HDL-c, and triglycerides) were evaluated. The results showed that by separating the sample into three groups (adequate BMI and WC, adequate BMI and elevated WC, and elevated BMI and WC), the group with high BMI and WC showed a high value of LAP and VAI compared to the other groups, with a significant difference. Still, the data show a positive and significant correlation when relating the LAP with VAI, HOMA-IR, BMI, WC, NC, total cholesterol, triglycerides, and Diastolic Blood Pressure. It also showed an inversely proportional relationship when associating LAP with HDL-c (p < 0.0001). Thus, we show that LAP is closely related to visceral adiposity, IR, altered lipid parameters, and blood pressure, especially diastolic in the patients included in our study. For these reasons, we suggest that LAP is a reliable indicator of promising visceral adiposity for early detection of cardiovascular risk in the adult and senior population.

Effects of Carbon Source on Growth Characteristics and Lipid Accumulation by Microalga <i>Dictyosphaerium</i>sp. with Potential for Biodiesel Production

Sustainability and eco-friendliness have both engendered research on alternative replacement of fossil fuel. This study was aimed at determining the effects of varying levels of glucose (10 ~ 40 g/L), and glycerol (0.25 ~ 1.0 mL/L) on the heterotrophic and mixotrophic growth and lipid production by Dictyosphaerium sp. The microalga was cultivated in 2000 mL amber-coloured bottles each containing 1000 mL of a sterile modified BG-11 medium at pH of 7.3. Each bottle was inoculated with a one-week-old pure culture of the isolate (inoculum ratio = 15%) and incubated in the dark at room temperature (30°C ± 2°C) for 10 d. Dictyosphaerium sp. showed the ability to grow heterotrophically and mixotrophically on glucose and on glycerol as a sole carbon substrates. Biomass productivity and specific growth rates did not vary when the initial medium glucose was varied. Lipid accumulation was not dependent on the initial medium glycerol contents. The mean lipid content and productivity of the organism in the present study were high enough to be utilised for industrial processes. Growth and lipid accumulations were better in mixotrophic cultures than both heterotrophic and autotrophic. However, both were better than autotrophic. The percentage compositions of the major fatty acids from Dictyosphaerium sp. grown under different culture conditions show at least five components each. The carbon skeletons eluted ranged from C14 to C22. Oleic acid was a major component of all the fatty acids, which confirm the suitability of the use of the oil for biodiesel production.

非酒精性脂肪性肝炎患者血清Nrf2、AOPP水平与血脂、肝纤维化的关系

目的探讨非酒精性脂肪性肝炎(NASH)患者血清核因子E2相关因子2(Nrf2)、晚期氧化蛋白产物(AOPP)水平与血脂、肝纤维化的关系。方法选择重庆医科大学附属璧山医院收治的104例NASH患者作为研究组,另选90例体检健康者作为对照组。检测并比较各组血清Nrf2、AOPP水平,采用Pearson或Spearman相关分析NASH患者血清Nrf2、AOPP水平与血脂、肝纤维化的关系,采用受试者工作特征(ROC)曲线评估血清Nrf2、AOPP水平对NASH的诊断价值。结果研究组甘油三酯(TG)、总胆固醇(TC)、低密度脂蛋白胆固醇(LDL-C)、Nrf2、AOPP水平均高于对照组(P<0.05),高密度脂蛋白胆固醇(HDL-C)水平明显低于对照组(P<0.05)。重度组血清Nrf2、AOPP水平高于中度组、轻度组(P<0.05),中度组血清Nrf2、AOPP水平高于轻度组(P<0.05)。相关分析结果显示,NASH患者血清Nrf2、AOPP水平与TG、TC、LDL-C、肝纤维化程度均呈正相关(P<0.05),与HDL-C呈负相关(P<0.05)。血清Nrf2诊断NASH的曲线下面积(AUC)为0.830(95%CI 0.780~0.880),血清AOPP诊断NASH的AUC为0.866(95%CI 0.816~0.916),二者联合诊断NASH的AUC为0.925(95%CI 0.875~0.975)。结论NASH患者血清Nrf2、AOPP水平均升高,且二者水平与血脂、肝纤维化程度均存在密切关系,有望作为诊断NASH发生的有效指标。

糖尿病前期患者肥胖相关指标特征及与T2DM发生的相关性分析

目的探究糖尿病前期患者内脏脂肪指数(VAI)、脂质蓄积指数(LAP)、甘油三酯-葡萄糖指数(TyG)等肥胖相关指标的特征及其与2型糖尿病(T2DM)发生的相关性。方法选取2020年1月至2022年12月于该院收治的64例T2DM患者作为观察组,同期64例糖尿病前期患者作为对照组。对比两组患者一般临床资料、糖脂代谢相关指标[总胆固醇(TC)、甘油三酯(TG)、低密度脂蛋白胆固醇(LDL-C)、高密度脂蛋白胆固醇(HDL-C)、血糖(FPG)及糖化血红蛋白(HbA1c)]、肥胖及胰岛功能相关指标[体重指数(BMI)、身体圆度指数(BRI)、VAI、LAP、TyG]。通过相关性分析及Logistic回归分析筛选T2DM发生的危险因素,通过受试者工作特征(ROC)曲线及曲线下面积(AUC)评价各危险因素对T2DM发生的预测价值。结果观察组患者腰围、TG、FPG、HbA1c、BMI、VAI、LAP、BRI及TyG均明显高于对照组(P<0.05)。相关性分析表明,患者BRI与FPG呈正相关(P<0.05),BMI与HbA1c呈正相关(P<0.05)。二元Logistic回归分析显示,患者BMI、VAI、LAP、TyG升高均是T2DM发生的独立危险因素(P<0.05),其中LAP水平对T2DM发生的预测价值最高,AUC为0.854。结论糖尿病前期患者BMI、VAI、LAP、TyG升高可能与T2DM的发生呈正相关,早期监测上述指标对预测糖尿病前期患者预后及疾病转归具有一定临床意义。

冷等离子体技术对肉品品质的影响研究进展

肉类及其产品在运输、贮藏等过程中常常受到微生物的污染而导致食用价值的降低和食源性疾病的发生。冷等离子体(cold plasma,CP)技术作为一种新型非热杀菌技术在肉品中得到广泛应用,主要通过产生的活性氮和活性氧对肉品进行杀菌进而达到杀菌保藏的目的,但其产生的各种活性粒子会对肉品的品质造成不同程度的影响。该文综述了CP技术的基本原理,从肉品脂质氧化、色泽、嫩度、风味、pH值5个方面详细阐述了CP技术对肉品品质的影响,同时探讨了其在肉品杀菌保藏中的应用,以期为CP技术在肉和肉制品中的应用和推广提供理论参考。

教研融合的食品科学与工程专业实验教学探索

以鱿鱼肝脏资源高值化利用为例,开展食品科学与工程专业创新性实验。实验涵盖了鱿鱼原料认知、鱿鱼肝脏中脂质制备、脂质及脂肪酸组成分析、脂质体制备、实施及结果分析,将原料学、食品工艺学、食品检测与分析、食品营养学等多门专业课的实践环节有机结合。实验内容涉及面广、涵盖知识点多,并构建了过程性考核和形成性评价的考评模式,有助于培养学生知识综合应用能力及创新能力。

凯氏拟小球藻Z6利用葛渣水解液合成油脂的工艺优化研究

【目的】筛选获得适合凯氏拟小球藻Z6(Parachlorella kessleri Z6)利用的木质纤维原料,通过单因素及响应面法优化该藻株培养条件,以期提高其油脂产量。【方法】通过探究葛渣、甘蔗渣、稻草秸秆及菌糠等4种水解液培养条件下凯氏拟小球藻Z6生物量与油脂产量变化,获得最优木质纤维原料;通过单因素、PB以及中心组合试验获得凯氏拟小球藻Z6最优培养工艺,并通过GC-MS技术分析优化前后凯氏拟小球藻Z6脂肪酸成分。【结果】(1)以葛渣水解液为发酵原料时,凯氏拟小球藻Z6的生物量与油脂产量最高;(2)利用PB试验获得葛渣水解液、硝酸钠、磷酸氢二钾和柠檬酸等4种成分为显著影响因素;(3)通过CCD中心组合试验确定凯氏拟小球藻Z6的最佳培养条件为70%葛渣水解液、0.70 g/L硝酸钠、0.02 g/L磷酸氢二钾、0.075 g/L七水硫酸镁、0.04 g/L二水氯化钙、0.008 g/L柠檬酸,其余成分与BG11培养基一致;(4)在最优组合条件下,凯氏拟小球藻Z6的油脂产量可达到2.22 g/L,相较于初始葛渣水解液培养基和异养培养基分别提升了43.23%和12.69%。【结论】葛渣水解液可作为凯氏拟小球藻Z6的发酵原料,经响应面法优化后的藻株Z6总脂量有显著提高,研究结果可为其他木质纤维素原料利用以及提高微藻产油性能提供有益的参考。

中国中老年女性脂质积累产物和内脏脂肪指数与膝骨关节炎的关联性

目的探讨中国中老年女性脂质积累产物(LAP)和内脏脂肪指数(VAI)与膝骨关节炎(KOA)的关联性。方法收集中国健康与养老追踪调查(CHARLS)数据库2011年的数据。采用Logistic回归和受试者工作特征(ROC)曲线分析LAP、VAI与KOA发病的关联。结果中国≥45岁女性KOA的患病率为34.01%(1257/3696)。单因素Logistic回归分析显示,LAP(OR=1.013,95%CI=1.012~1.014)、VAL(OR=1.137,95%CI=1.117~1.158)与KOA发病呈正相关。在调整混杂因素后,LAP(OR=1.003,95%CI=1.002~1.004)和VAI(OR=1.048,95%CI=1.029~1.069)仍与KOA发病呈显著正相关。LAP的ROC曲线下面积(AUC)为0.725(95%CI=0.709~0.741),VAI的AUC为0.630(95%CI=0.613~0.647)。结论LAP和VAI增高是KOA发病的危险因素。LAP对中老年女性KOA的发病有一定的预测价值。

肥胖测量指标在预测代谢相关脂肪性肝病健康风险中的应用价值

目的评估肥胖测量指标对代谢相关脂肪性肝病(Metabolic-associated fatty liver disease,MAFLD)健康风险的预测价值。方法选取2023年6月1日-12月31日在新疆医科大学第一附属医院健康管理中心体检的49155例体检者,根据诊断标准,将其分为MAFLD组和非MAFLD组,并计算体质指数(BMI)、腰臀比(WHR)、内脏脂肪指数(VAI)、脂质蓄积指数(LAP)。BMI分为正常、超重、肥胖组;腰围(WC)分为正常、中心性肥胖前期和中心性肥胖组。采用Logistic回归模型分析性别亚组中肥胖测量指标及生化指标的差异。绘制受试者工作特征(ROC)曲线评估各指标对MAFLD的预测价值。结果共检出MAFLD 23765例(48.35%),其中男性18030例(75.87%),女性5735例(24.13%)。同一性别中,MAFLD组除高密度脂蛋白胆固醇(HDL-C)水平低于非MAFLD组外,其余指标水平均高于非MAFLD组(P均<0.001);校正混杂因素后Logistic模型显示,MAFLD发生风险随BMI、WC、WHR、VAI、LAP水平增高而增高;ROC分析发现,BMI、WHR、VAI和LAP预测不同性别组MAFLD的曲线下面积(AUC)均大于0.7,其中LAP的AUC值最大,且预测女性的AUC值[0.896(0.891~0.900)]大于男性AUC值[0.831(0.826~0.836)],最佳截断值为25.49、39.26(P均<0.05);BMI×LAP联合模型在不同性别中预测价值最高,AUC值分别为男性0.846(0.841~0.850)、女性0.908(0.904~0.913)(P均<0.05)。结论MAFLD发生风险随BMI、WHR、VAI、LAP水平升高而增高,LAP相较于其他指标预测价值更高,尤其在女性中。BMI×LAP可作为不同性别中MAFLD健康风险评估的有力工具。

铜对动物脂质代谢影响的研究进展

铜是动物机体必需的营养元素,其以辅基的形式参与体内多种酶(细胞色素氧化酶、铜蓝蛋白、过氧化物歧化酶、赖氨酰氧化酶等)的构成,从而参与生物体的多种代谢过程,影响动物生长发育、造血、免疫等功能。研究表明,添加高铜有助于改善动物生产性能,但会导致体内铜过量蓄积,改变机体代谢,影响体脂合成,与多种疾病的发生发展有关;铜缺乏与人的高胆固醇血症、心血管疾病、非酒精性脂肪肝等多种疾病有密切关系。因此,本文系统地综述了铜在动物体内的代谢,阐明铜对脂质代谢调控和畜禽产品品质的影响,为铜在动物生产中的科学应用提供参考,同时指出铜在未来需要进一步探讨和研究的方向。

胆汁酸对动物糖脂代谢的调控及在动物生产中的应用

胆汁酸是糖脂代谢中的重要调控物质,具有乳化脂肪、促进营养物质吸收、改善肠道微生物组成、调节免疫系统的作用。胆汁酸可以通过调节肠道中的脂肪吸收、胆固醇排泄以及肝脏的胆固醇合成来影响机体的糖脂代谢。此外,胆汁酸还可以影响动物体内胰岛素的敏感性和分泌,从而对血糖水平和胰岛素抵抗产生影响。目前,关于胆汁酸的合成机制以及疾病方面的研究较为完善,但胆汁酸在动物生产中的应用还较少。胆汁酸除促进脂肪的乳化吸收外,在提高生产性能、保护肠道健康、缓解热应激、保护肝脏等方面也具有显著效果。文章从胆汁酸的合成调控、对糖脂代谢的影响以及在动物生产中的应用等方面进行综述,以期为胆汁酸的进一步的开发与利用提供参考。

围产期日粮添加姜黄素对山羊生产性能、血液指标及炎症因子基因表达的影响

【背景】山羊繁殖力对肉羊产业有直接影响,而围产期是山羊繁殖过程中特殊的生理时期,此时母畜采食量减少,能量摄入降低,同时子代的营养需求急剧增加,母羊在此阶段容易进入能量负平衡状态,诱发一系列不良反应,如代谢疾病,炎症反应,造成免疫抑制甚至流产等问题。【目的】通过对围产期日粮添加姜黄素缓解母羊能量负平衡状态,从山羊生产性能、血液指标和炎症因子基因表达等方面入手,为改善围产期山羊健康提出可行路径。【方法】选择18只妊娠122 d(即产前28 d)的经产苏白母山羊,分为对照组(无添加,Con)和姜黄素组(Curcumin,下文缩写Cur补充Cur 800 mg·kg^(-1)DMI)。采集母羊产前21 d(d_(-21))、产后0(d_(0))和21 d(d_(21))的血液,测定生产性能、血液指标及炎症因子基因表达。【结果】Cur处理不影响母羊采食量、羔羊出生体重体尺和日增重;两组母羊分娩前后采食量均表现为先下降后升高的趋势,在分娩当日采食量最低(P=0.097)。Cur处理有提高血清葡萄糖含量的趋势(P=0.075)。Cur处理显著降低d_(0)和d_(21)的血清游离脂肪酸(NEFA)含量(P<0.05),但不影响低密度脂蛋白(LDL)、高密度脂蛋白(HDL)、总胆固醇(TC)及甘油三酯(TG)含量(P>0.05)。Cur处理有提高d_(21)总抗氧化能力(T-AOC)水平的趋势(P=0.073),显著降低了d_(0)丙二醛(MDA)含量,但不影响超氧化物歧化酶(SOD)和谷胱甘肽过氧化物酶(GSH-Px)水平(P>0.05)。Cur处理不影响免疫球蛋白A(IgA)、免疫球蛋白G(IgG)和免疫球蛋白M(IgM)含量(P>0.05)。Cur处理显著升高d_(21)核转录因子红系2(Nrf2)表达量(P<0.05),降低d_(0)肿瘤坏死因子(TNFα)表达量(P<0.05),但不影响白细胞介素-1(IL-1)、白细胞介素-6(IL-6)及干扰素γ(IFNγ)基因表达量(P>0.05)。【结论】围产期日粮添加姜黄素能在一定程度上降低围产期母羊的血清游离脂肪酸水平,增强抗氧化性能,降低炎症反应。

白藜芦醇调控畜禽脂质代谢作用机制及应用研究进展

脂质代谢是动物机体能量转化代谢的重要生理过程,与畜禽生长发育、脂肪沉积等密切相关。白藜芦醇是一种广泛存在于自然界中的芪类多酚化合物,可通过腺苷酸活化蛋白激酶和过氧化物酶体增殖物激活受体等多条途径调节畜禽脂质代谢。目前的研究发现,白藜芦醇对畜禽不同类型脂肪组织的脂质代谢存在差异影响。本文综述了白藜芦醇调控脂质代谢的机制途径及在畜禽生产中的应用研究进展,以期为白藜芦醇的精准化开发与应用提供参考。

CCTA斑块特征联合冠周脂肪衰减指数与FFR CT预测急性冠脉综合征的临床价值

目的:探讨冠状动脉周围脂肪衰减指数(FAI)、无创血流储备分数(FFR CT)与冠状动脉CT血管成像(CCTA)斑块特征预测5年内发生急性冠状动脉综合征(ACS)的临床价值。方法:回顾性纳入ACS发生前2个月至5年行CCTA检查的ACS患者(n=46),另选取同期接受检查CCTA检查的患者作为对照组(n=55),对比两组患者的临床资料及影像学参数,在血管水平分析相关参数对ACS的预测价值,并建立Logistic回归预测模型。结果:ACS组(n=60)的近端周围FAI、脂质斑块体积、狭窄率较对照组明显升高,点状钙化和FFR CT阳性的频率更高(均P<0.05)。单因素和多因素分析显示,近端周围FAI、狭窄率、点状钙化、脂质斑块体积及FFR CT阳性是预测ACS的独立危险因素。与其他模型相比,结合斑块特征、近端周围FAI和FFR CT阳性的联合模型预测效能最高(AUC=0.87,P<0.05)。结论:斑块特征、FFR CT和FAI联合应用可有效提高未来发生ACS的预测能力,有助于指导患者的风险分层及临床决策。