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| 1 | +# Guava Muse SOP |
| 2 | + |
| 3 | +The Guava Muse Cell Analyzer provides automated cell count and viability measurements. These protocols cover setup, daily operation, and maintenance. |
| 4 | + |
| 5 | +It is highly recommend you read through the manufacturer's protocol prior to using the machine! |
| 6 | + |
| 7 | +- [Cytek-muse-guava-cell-analyzer.pdf](https://github.com/RobertsLab/resources/blob/master/equipment_manuals/Cytek-muse-guava-cell-analyzer.pdf) (GitHub) |
| 8 | + |
| 9 | +## Kits Used |
| 10 | + |
| 11 | +- **Muse System Check Kit**: Verifies the performance of the system by assessing counting accuracy and fluorescence detection using a standardized fluorescent bead reagent. The kit contains a bead reagent and diluent. |
| 12 | +- **Muse Count & Viability Kit**: Used to determine viability and total cell count. Accurate assessments can be made with a wide variety of cell lines, even those with unusual culture conditions or a tendency to aggregate. |
| 13 | + |
| 14 | +--- |
| 15 | + |
| 16 | +If this is the first time the machine is being _ever_ being used, please see [Instrument Setup Section](#instrument-setup-first-time-only). |
| 17 | + |
| 18 | +## Daily Startup Procedure |
| 19 | + |
| 20 | +1. **Turn On Unit** |
| 21 | + - Press power button if not auto-on. Wait for touchscreen to initialize. |
| 22 | + |
| 23 | +2. **Prepare Fluids** |
| 24 | + - Empty waste bottle, rinse, and refill with 10 mL bleach. |
| 25 | + - Refill cleaning bottle with Guava ICF to indicator line. |
| 26 | + - Reconnect fluid tubing. |
| 27 | + |
| 28 | +3. **Reset Fluid Levels** |
| 29 | + - On touchscreen: `Menu` → `System Check` → `Clean` → `Reset Fluid Levels`. |
| 30 | + |
| 31 | +4. **Run Complete System Clean** |
| 32 | + - On touchscreen: `Menu` → `Muse System Cleaning` → `Complete System Clean`. |
| 33 | + - Load full tube of Guava Instrument Cleaning Fluid (ICF) → then DI water. |
| 34 | + - Run until log confirms success. |
| 35 | + |
| 36 | +5. **Run System Check** |
| 37 | + - Mix beads prior to making solution. |
| 38 | + - Prepare 1:20 dilution of System Check Beads. |
| 39 | + - On touchscreen: `Menu` → `Essential Tools` → `System Check`. |
| 40 | + - Enter Lot #, Expiration, Check Code (found on bead kit card). |
| 41 | + - Mix beads, load tube, run 3 replicates. |
| 42 | + - Confirm **PASS** status and %CV ≤10%. |
| 43 | + - Export results (optional). |
| 44 | + |
| 45 | +> **Note**: The values recorded during the replicates should be green/grey, meaning they fall within the expected range. If they are red, the values are too high/low, and the system check will fail. This check is temperamental. Values should be within $4.5 \times 10^4$ - $5.5 \times 10^4$. |
| 46 | +
|
| 47 | +--- |
| 48 | + |
| 49 | +## Daily Shutdown Procedure |
| 50 | + |
| 51 | +1. **Run Complete System Clean** |
| 52 | + - Same as startup. Ends with DI water rinse. |
| 53 | + |
| 54 | +2. **Leave DI Water Tube on Loader** |
| 55 | + - Never leave bleach or ICF on the system overnight. |
| 56 | + |
| 57 | +3. **Power Down** |
| 58 | + - On touchscreen: `Menu` → `Power Options` → `Power Off`. |
| 59 | + |
| 60 | +--- |
| 61 | + |
| 62 | +## Maintenance Log Example |
| 63 | + |
| 64 | +| Date | User | Waste emptied | ICF refilled | System Clean | System check (p/f) | Notes | |
| 65 | +| :--- | :--- | :--- | :--- | :--- | :--- | :--- | |
| 66 | +| 18/04/25 | Aakriti | No | Yes | Yes | Pass | First use so did not empty waste | |
| 67 | +| 21/04/25 | Aakriti | Yes | Yes | Yes | Pass | | |
| 68 | +| 24/04/25 | Aakriti | Yes | Yes | Yes | Pass | | |
| 69 | + |
| 70 | +--- |
| 71 | + |
| 72 | +## Important Usage Notes |
| 73 | + |
| 74 | +- **Quick Clean**: When running samples, need to run a quick clean every 20 acquisitions. |
| 75 | + |
| 76 | +-- |
| 77 | + |
| 78 | +## Instrument Setup (First-Time Only) |
| 79 | + |
| 80 | +1. **Unpack and Position** |
| 81 | + - Carefully remove the Muse from the shipping box and save all packaging. |
| 82 | + - Place it on a stable surface away from vibrations. |
| 83 | + |
| 84 | +2. **Connect Fluid Bottles** |
| 85 | + - Connect color-coded fluid tubing to the back of the instrument. |
| 86 | + - Fill waste bottle: add ~10 mL bleach (to first fill line). |
| 87 | + - Fill cleaning solution bottle to the indicator line with Guava ICF. |
| 88 | + - Insert bottles into their matching receptacles and connect the tubing. |
| 89 | + |
| 90 | +3. **Insert Flow Cell** |
| 91 | + - Open the access door and follow flow cell insertion. |
| 92 | + |
| 93 | +4. **Power On** |
| 94 | + - Plug the Muse into a grounded outlet. It turns on automatically the first time. |
| 95 | + |
| 96 | +5. **Log On as Administrator** |
| 97 | + - Select Administrator account on first login (p. 35). |
| 98 | + - **Important**: Add a new Admin-level user to avoid losing access to data. |
| 99 | + |
| 100 | +6. **Initial Cleaning** |
| 101 | + - Run **Complete System Clean** → do this twice on first use (On touchscreen: `Essential Tools` > `Complete System Clean`) (p. 63). |
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