The present disclosure relates to a method for analyzing one or more parameters of a viral nucleic acid vector, and belongs to the field of biological technology. The method may optionally comprise preparing a particle size standard curve and/or a concentration standard solution for the viral nucleic acid vector to measure the particle size and the concentration thereof. The method comprises preparing a specific target recognition reagent conjugated to a fluorescence labeling reagent for the parameters of the viral nucleic acid vector, detecting a sample by a flow particle analyzer, and the like. The method enables a deeper analysis of the viral titer obtained by traditional approaches, yielding more accurate detection results, which is of significant importance for downstream release decisions, process control, and the evaluation of clinical safety.

Provided herein are, in various embodiments, methods and kits for assaying one or more virions. In certain embodiments, the methods and kits of the disclosure provide for the calculation of virion titer and/or virion infectivity. In still further embodiments, the disclosure provides for methods and kits for enhancing assaying of viruses such as SARS-CoV-2.

The present disclosure provides methods for preparing digested virus proteins, including adenovirus and adeno-associated virus capsid proteins, from a sample of virus proteins, as well as methods of analyzing such digested virus proteins via liquid chromatography-tandem mass spectrometry. The methods include the use of a mixture of sodium deoxycholate (SDC) and N-dodecyl-beta-D-Maltoside (DDM) to rapidly and easily prepare the digested virus proteins.