Reaction vessel
Clean collection vials
Labelled sample tubes
Dispensing tips
Magnetic stir bar
Gloves and laboratory wipes
NSL Modules Used
Sterilization UV
Reservoir Dispense
Stirrer
Heater, if controlled incubation is required
Wait
LED Illumination
UV Illumination, only for chamber illumination where required
IR Illumination, only for camera support where required
Camera
Exhaust
Environment Sensors
Sonicator, optional and only for pre-dispersion support
Offline / Manual / External Steps
Protein concentration verification
Separation of nanoparticle-protein complexes
Centrifugation or filtration
Protein corona quantification
UV-Visible absorbance spectroscopy
DLS particle size analysis
Zeta potential measurement
FTIR or fluorescence analysis
SDS-PAGE or electrophoresis
Microscopy or electron microscopy
Biological safety or cell interaction testing
Methods: NSL-Compatible and Protoly-Managed Steps
Step 1: Chamber Preparation
Module / Step Type: Sterilization UV
Function: Timed UV sterilization cycle
Suggested Duration: 5 minutes
Run a timed UV sterilization cycle before beginning the nanoparticle-protein interaction workflow. This step prepares the chamber environment before automated liquid handling.
Step 2: Initial Environment Record
Module / Step Type: Environment Sensors
Function: Ambient chamber condition recording
Record the initial chamber environment before starting the incubation workflow. This helps document the conditions under which the nanoparticle-protein interaction sample was prepared.
Step 3: Visual Monitoring Setup
Module / Step Type: LED Illumination and Camera
Function: White light illumination and camera readiness
Turn on LED illumination and enable camera-based visual documentation. This supports recording of colour, turbidity, settling, or visible aggregation during the study.
Step 4: Dispense Buffer Medium
Module / Step Type: Reservoir Dispense
Function: Liquid dispensing from calibrated reservoir channel
Reagent: Buffer or deionized water
Suggested Volume: 50-150 u L
Channel: 1
Dispense the selected buffer or aqueous medium into the reaction vessel to establish the incubation environment.
Step 5: Dispense Silver Nanoparticle Dispersion
Module / Step Type: Reservoir Dispense
Function: Nanoparticle dispersion addition
Reagent: Silver nanoparticle dispersion
Suggested Volume: 50-200 u L
Channel: 2
Add the silver nanoparticle dispersion into the reaction vessel. The nanoparticle concentration should be selected before the run and recorded as part of the batch condition.
Step 6: Pre-Incubation Mixing
Module / Step Type: Stirrer
Function: Controlled mixing
Mode: Continuous
Suggested RPM: 250-450
Suggested Duration: 5-10 minutes
Mix the silver nanoparticle dispersion gently in the buffer medium to improve uniformity before protein addition. Avoid excessive stirring that may cause foam or destabilization.
Step 7: Dispense Model Protein Solution
Module / Step Type: Reservoir Dispense
Function: Protein solution addition
Reagent: Model protein solution
Suggested Volume: 20-100 u L
Channel: 3
Dispense the selected protein solution into the nanoparticle dispersion. This begins the nanoparticle-protein interaction phase that may lead to protein corona formation.
Step 8: Controlled Interaction Mixing
Module / Step Type: Stirrer
Function: Low-to-moderate mixing
Mode: Continuous
Suggested RPM: 200-350
Suggested Duration: 10-20 minutes
Mix the nanoparticle-protein system gently to support uniform interaction without causing unnecessary aggregation or foaming.
Step 9: Incubation Hold
Module / Step Type: Wait
Function: Defined nanoparticle-protein interaction time
Suggested Duration: 30-120 minutes
Hold the mixture for a defined incubation period to allow protein adsorption and corona development. The duration may be varied between batches to study time-dependent interaction.
Step 10: Optional Mild Temperature Control
Module / Step Type: Heater
Function: Controlled incubation support
Suggested Temperature: 25-37 deg C
Suggested Duration: As per study design
Use mild temperature support only if required by the experimental design. Temperature should be selected based on protein stability and study objective.
Step 11: Optional Additional Protein or Buffer Addition
Module / Step Type: Reservoir Dispense
Function: Condition variation step
Reagent: Additional protein solution, buffer, or dilution medium
Suggested Volume: As per study design
Channel: 4
Use this step to create a second incubation condition, dilution condition, or protein concentration variation. Record the exact condition for batch comparison.
Step 12: Secondary Incubation
Module / Step Type: Wait
Function: Additional hold period
Suggested Duration: 15-60 minutes
Allow the adjusted nanoparticle-protein mixture to stabilize before sample collection or offline separation.
Step 13: Final Visual Documentation
Module / Step Type: LED Illumination and Camera
Function: Visual observation and recording
Document the final sample appearance. Record visible colour change, turbidity, sedimentation, foam, or aggregation. This is visual documentation only and should not be described as quantitative spectroscopy.
Step 14: Manual Sample Removal and Labelling
Module / Step Type: Manual / offline step
Remove the prepared nanoparticle-protein mixture from the system and transfer it into a clean labelled vial. Record batch ID, nanoparticle concentration, protein type, protein concentration, incubation time, temperature condition, and visual observations.
Step 15: External Separation and Characterization
Module / Step Type: Offline / external analysis step
Separate nanoparticle-protein complexes if required using centrifugation, filtration, or another suitable external method. Perform downstream characterization such as protein assay, UV-Visible spectroscopy, DLS, zeta potential, FTIR, fluorescence, electrophoresis, or microscopy.
Methodology
The silver nanoparticle-protein corona model sample was prepared using a Protoly-managed workflow supported by selected NSL hardware modules. Before beginning the interaction study, the chamber was subjected to a timed UV sterilization cycle. Ambient chamber conditions were recorded using the environment sensor module, and LED illumination with camera support was activated for visual documentation.
Buffer medium or deionized water was first dispensed into the reaction vessel using the reservoir dispensing module. A prepared silver nanoparticle dispersion was then added through a separate reservoir channel. The nanoparticle dispersion was mixed gently using the stirrer module to obtain a uniform working suspension before addition of the protein phase.
A selected model protein solution, such as bovine serum albumin, casein, gelatin, or lysozyme, was dispensed into the silver nanoparticle dispersion. The mixture was stirred at low-to-moderate speed to promote uniform nanoparticle-protein contact while minimizing foam formation or mechanical disturbance. The sample was then held for a defined incubation period using the Wait module to allow adsorption of protein onto the nanoparticle surface.
If required by the study design, mild temperature support was applied using the heater module. Additional buffer or protein solution could also be added as a condition-variation step. After incubation, the sample was visually documented using LED illumination and the camera module. Observations such as colour shift, turbidity change, sedimentation, or visible aggregation were recorded as preliminary indicators of interaction or instability.
The prepared nanoparticle-protein mixture was manually collected into labelled vials for offline separation and characterization. External methods such as centrifugation, protein assay, UV-Visible spectroscopy, DLS, zeta potential measurement, FTIR, fluorescence analysis, SDS-PAGE, or microscopy may be used to confirm protein adsorption and evaluate changes in nanoparticle behaviour. This workflow is intended for research and educational nano-biointerface studies and does not independently establish biological safety or therapeutic performance.