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荧光爱好者周刊(第五十五期)

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荧光爱好者周刊(第五十五期)

荧光爱好者周刊(第五十五期)#

卷首导语#

本周收录多篇荧光方向最新研究成果,研究体系覆盖有机‑无机发光材料开发、各类荧光探针传感体系、多模态荧光成像装备与算法、生物医学临床荧光应用,同时大量出现机器学习与光谱数据结合的交叉研究,应用场景延伸至环境污染物分析、食品安全检测、植物表型解析、文物分析等多个方向。材料层面包含金属有机框架、碳点、纳米簇、有机小分子、共轭聚合物等;技术路线上比率传感、FRET传感、X射线荧光、激光诱导荧光、共聚焦显微、光谱解译与深度学习模型融合成为本周期高频出现的技术手段。

一、有机发光与光物理新材料#

在发光材料与基础光物理研究方面,多项工作围绕分子、聚合物以及无机稀土发光体系开展构效关系解析。Yang等¹在Macromolecules中以非共轭聚降冰片烯作为模型骨架,系统探究发色团平面度与聚合度对荧光行为的调控规律,区分了单链缠结效应与分子间聚集带来的不同发光变化,蒽基单元随聚合度升高发生荧光淬灭,而四苯乙烯单元在水诱导下表现聚合度放大的AIE效应,为非共轭聚合物荧光机理解析提供实验范式。面向稀土发光测温,Sun等²在Journal of Photochemistry and Photobiology A: Chemistry制备Bi³⁺、Sm³⁺共掺杂GdVO₄纳米磷光体,利用两种离子差异化的热淬灭特性构建荧光强度比率测温方案,0.4 mol% Sm³⁺掺杂样品最高相对灵敏度可达2.51% K⁻¹,升温过程材料发光可由黄绿向橙红色转变,具备可视化粗略测温潜力。Wu等³于Materials Chemistry Frontiers发表综述,系统梳理荧光聚苯胺的制备、结构特征与发光行为,归纳本征发光、掺杂调控、纳米复合、衍生物四大类材料体系,同时指出量子效率不足、导电性‑发光难以兼顾等现存瓶颈,指明后续研发方向。Liu等⁴在Journal of Physical Chemistry C针对庚嗪衍生物开展理论与瞬态光谱研究,证实该类分子可实现负的单重态‑三重态能隙,获得纳秒级超快延迟荧光,明确简并HOMO‑LUMO轨道是实现反转单重态‑三重态分裂的关键要素,为IST型发光分子理性设计提供理论依据。

二、荧光探针与化学传感#

荧光化学传感板块涵盖金属离子、环境有害物、小分子污染物等多种靶标,材料平台包括MOF、碳点、共价有机框架、纳米簇、有机小分子等。Wang等⁵在Journal of Molecular Structure报道La基三维配位聚合物,该材料既可以催化环氧氯丙烷与CO₂环加成反应,又能够作为荧光探针,可同时检测4‑硝基苯酚、氟酰胺以及Fe³⁺,检出限分别达到0.078 μM、0.087 μM、0.35 μM,淬灭机制以竞争能量吸收与光诱导电子转移为主。Qin等⁶在Journal of Fluorescence对环三磷腈共价有机框架进行苯胺接枝改性,优化分子内电荷转移效率,得到对肼具有“turn‑on”响应的PTCOF‑AN探针,检出限低至153 nM。Li等⁷在Journal of Environmental Chemical Engineering利用废弃PET与松木锯屑为原料,通过微波‑水热法制备碳点PETW‑CDs用于Hg²⁺检测,该材料量子产率21.3%,对Hg²⁺检出限0.34 μM,可应用于径流实际水样,淬灭由基态缔合与激发态非辐射弛豫共同主导。Guo等⁸在Journal of Photochemistry and Photobiology A: Chemistry构建基于红色发射碳量子点的适配体‑石墨烯氧化物FRET传感平台R‑CDs@Pb²⁺‑apt/GO,识别Pb²⁺后FRET被阻断,荧光恢复,血清样本中检出限0.03 nM,同时还可实现小麦植株体内Pb²⁺的活体成像。Zhang等⁹在Analytical and Bioanalytical Chemistry合成银掺杂金双金属纳米簇L‑Cys@Au‑Ag NCs用于槲皮素检测,银掺杂诱导聚集态变化带来荧光增强与蓝移,检测线性区间9.07‑115 μM,检出限1.064 μM,结合机器学习与HPLC完成葡萄果汁样本定量。Das等¹⁰在ChemistrySelect报道萘酰胺‑甲酚类探针,依靠氢键在伪空腔内实现碘离子选择性识别,不受其他卤离子与常见阴离子干扰,检出限8.2×10⁻⁸ M。Hien等¹¹在Journal of the Chinese Chemical Society将市售抗炎药物苯达明盐酸盐直接用作Hg²⁺的turn‑off型荧光探针,在中性水溶液中完成检测,结合光谱与DFT、TD‑DFT解析淬灭来源于配位作用,而非聚集、内滤效应等干扰因素。Jiao等¹²在Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy制备可调控二氧化硅壳层厚度的Fe₃O₄@SiO₂@Ag@SiO₂核壳磁性纳米颗粒,同时实现表面增强荧光与SERS双信号增强,最优SEF增强因子7.37,材料兼具磁回收与良好稳定性。

三、食品‑环境检测与机器学习‑荧光交叉#

本批次大量工作将机器学习算法与荧光光谱、EEM矩阵结合,服务于食品、环境样本高通量解析。Li等¹³在Food Chemistry构筑MOF‑on‑MOF异质结ZTA用于四环素类抗生素检测,结合多种机器学习分类算法以及YOLOv5荧光图像识别,动物源性食品样品回收率95.40%‑108.50%,识别准确率接近100%。Zeng等¹⁴在Analytical Chemistry提出SuperEEM超分辨重建框架,基于U‑Net‑GAN网络由稀疏低分辨EEM重建高分辨三维荧光矩阵,保留荧光峰拓扑与强度信息,将采集效率提升14倍,在多环芳烃定量、食用油与啤酒分类任务上验证可靠性,并配套可视化GUI工具。Yin等¹⁵于Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy搭建CNN‑PCA‑RF融合模型,直接利用三维荧光EEM矩阵完成工业废水污染源溯源,构建五大行业共计207条数据集,出口级别识别精度可达95.99%,稀释样本依然保持较高识别能力。Wu等¹⁶同样在Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy利用可见光‑近红外光谱结合ResNet18‑CBAM深度学习模型,实现菌草叶片叶绿素荧光参数Fv/Fm快速无损预测,借助迁移学习完成不同物种间模型适配,SHAP分析明确与光合色素、叶片水分相关的特征波段。Li等¹⁷在Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy融合反射光谱与太阳诱导叶绿素荧光特征,使用随机森林算法提升马铃薯叶面积指数LAI估算精度,解决高LAI条件下植被指数饱和问题。在文物分析领域,Freitas等¹⁸在Journal of Cultural Heritage把非负矩阵分解与主成分分析用于宏观X射线荧光(MA‑XRF)数据集,分析巴西画家Djanira作品颜料元素分布,为画作真伪与年代辅助判别提供技术手段。Yang等¹⁹在Biosensors开发多孔硅布拉格镜结合上转换纳米颗粒的便携荧光传感平台,适配水胺硫磷农药检测,检出限0.27 μg/L,对结构相似有机磷农药具备良好选择性。Jia等²⁰在Food Frontiers构建基于AIE纳米颗粒的AuNPs触发双谱荧光淬灭侧向流免疫分析,用于肉类样本中丹诺沙星检测,荧光模式检出限0.012 ng·mL⁻¹,比色模式检出限0.032 ng·mL⁻¹。

四、荧光成像技术、仪器与计算成像#

成像技术板块涵盖硬件装置改造、算法增强、激光诱导荧光表征、各类显微成像技术。Sotelo‑Silveira等²¹在Communications Engineering提出改造普通荧光显微镜实现亚10 nm单分子定位显微的方案,以较低硬件成本获取高性能单分子定位成像结果。Gu等²²在Fuel利用平面激光诱导荧光PLIF结合大涡模拟LES,研究微混合燃烧器受限微通道内燃料射流混合,揭示喷射角度调控涡拓扑结构可以消除近壁混合盲区,为微型燃烧装置优化提供依据。Slipchenko等²³在Science Advances报道多层荧光‑光旋色散(F‑ORD)技术,用于亚单层界面手性薄膜表征。Guo等²⁴在IEEE Transactions on Computational Imaging提出HF²SC²L‑Net网络,实现NIR‑IIa向NIR‑IIb非配对图像增强,改善肿瘤定位与血管可视化效果,为NIR‑II临床成像后处理提供算法工具。Wang等²⁵在Plasma Sources Science and Technology将激光诱导荧光LIF用于容性耦合等离子体,直接测量复杂等离子体系下离子流速与离子温度,更新尘埃等离子领域传统认知。Zhang等²⁶在Biophysical Reviews发表综述,阐述FLIM与FCS多维荧光观测手段如何解析生物分子凝聚体微环境与分子动力学,区分生理性凝聚体与病理聚集组装。

五、生物医学荧光应用#

生物医学方向覆盖手术导航、临床病理检测、牙科、眼科、病毒表征、微生物染色、RNA标记等多个场景。Gibson等²⁷在Burns利用第二窗口吲哚菁绿SWIG成像,在小鼠烧伤模型区分炎症与坏死组织,研究提示需要优化ICG探针,才能够把EPR效应和坏死亲和效应分离开,支撑烧伤术中坏死组织精准切除。Aspholm等²⁸在Current Protocols建立简单低成本硫黄素T(ThT)芽孢荧光染色完整实验流程,染色芽孢4 ℃避光保存荧光可维持两年,甲醛固定后依旧保有信号,并且不影响芽孢萌发活性,适合显微成像以及萌发筛选平板读数。Marquezin等²⁹在Journal of Fluorescence利用人腺病毒蛋白本征色氨酸、酪氨酸内源荧光,研究病毒颗粒在灭活、温度、表面活性剂、脂质体作用下的构象变化。Rosenthal等³⁰于Scientific Reports借助近红外荧光成像对FFPE临床石蜡大样本高通量扫描,评价治疗抗体Pan800在人体肿瘤标本内多尺度递送异质性,证实宏观荧光信号与显微测量具备相关性,同时提示脱钙处理会显著降低荧光信号。Longo等³¹在Modern Pathology开展前瞻性介入研究,评估离体荧光共聚焦显微镜EVFCM在莫氏手术非黑色素瘤皮肤癌切缘评估,阅片者间一致性几乎完美,整体诊断准确率96.4%,具备术中快速评估潜力。Xing等³²在Frontiers in Surgery回顾性评估第二代ICG融合荧光内镜用于垂体神经内分泌瘤经蝶手术,15‑18 min观测窗口内可划分三类荧光对比模式,观察者间一致性优秀,但模式对肿瘤‑垂体界面评估的临床价值还需要前瞻性验证。Sadamura等³³在Photodiagnosis and Photodynamic Therapy定量评估放大倍率、光照强度、工作距离对荧光辅助根管治疗FARCT成像信号的影响,给出有利于荧光可视化的成像参数,为牙科荧光成像标准化提供依据。Tomo等³⁴在Journal of Oral and Maxillofacial Surgery, Medicine, and Pathology整合综述光学荧光在基层口腔潜在恶性病变筛查证据,指出现有技术更多是辅助检查,特异性不稳定,需要判读标准规范化。Wilhelmsson等³⁵在Current Opinion in Chemical Biology综述核酸荧光标记策略,梳理RNA递送研究中的标记方案,为RNA治疗相关体外实验提供选型参考。Juhyun等³⁶在Current Treatment Options in Cardiovascular Medicine综述光片荧光显微LSFM在斑马鱼心脏血管三维成像的应用,区分已验证应用与可迁移方法,明确定量评估指标。

本周亮点速览#

本期多项成果具备较高参考价值,其中Zeng等¹⁴在Analytical Chemistry提出的SuperEEM框架,针对三维激发‑发射矩阵荧光光谱实现超分辨重建,在保留光谱定量信息的前提下大幅缩短采集耗时,为高通量EEM分析提供新的算法工具,对环境、食品领域大批量样本筛查具备很强实用潜力。其次,Guo等²⁴开发的HF²SC²L‑Net深度学习网络,完成NIR‑IIa到NIR‑IIb跨域图像增强,不依赖配对标注数据,可提升近红外二区荧光成像的肿瘤与血管可视化效果,对术中荧光成像后处理算法开发有借鉴意义。第三,Longo等³¹在Modern Pathology完成的离体荧光共聚焦显微镜莫氏手术切缘评估前瞻性临床研究,大样本证实EVFCM技术的高诊断准确率与阅片一致性,推动荧光显微技术真正落地皮肤肿瘤外科术中病理评估。第四,Wu等³的综述系统梳理荧光聚苯胺材料,完整总结该类兼具导电性与发光特性材料的发展现状,明确量子效率、发光‑导电协同等关键瓶颈,对导电发光聚合物方向后续研发具备很好指引价值。

趋势观察#

综合本周这批文献可以看出,荧光光谱与深度学习的融合已经从概念走向实际样本验证,EEM矩阵、高光谱、荧光成像都大量引入CNN、随机森林、GAN等模型,用于溯源、分类、图像增强与参数预测,成为本周期最突出的趋势。材料层面,MOF、碳点、纳米簇、共价有机框架继续作为传感主流平台,并且越来越多工作开始关注废弃生物质等廉价前驱体制备功能荧光材料,兼顾性能与绿色合成。应用端上,荧光技术持续向临床转化推进,覆盖外科术中导航、牙科、口腔病变筛查、病理离体评估,但临床研究普遍指出特异性、成像参数标准化、判读阈值规范化是落地必须解决的现实问题。与此同时,现有研究依然存在不少共性局限,多数传感体系的验证集中在实验室模拟样本,复杂真实基质长期稳定性、抗多种共存干扰物能力仍有待更多实测;机器学习模型存在数据集依赖,跨样本库、跨仪器设备泛化能力需要进一步检验;很多新探针与新材料尚停留在体外阶段,距离真正体内实际应用还有较长验证链条。

参考文献#

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