2.7. In Vitro Red Blood Cell (RBC) Irritation Assay
Approximately 2 mL of RBC obtained from a volunteer (Pusat Kesihatan, UPM) and was washed in PBS in a ratio of 1 : 10, followed by centrifuged for 10 min at 1500 rpm with a controlled temperature of 10°C, and this step was repeated triplicate. The RBC was then diluted with PBS to a 1% concentration. Each 100 μL of RB, COM maltodextrin, and Multidex were loaded into the first well in a 96-well plate separately, followed by 50 μL of PBS loaded from the 2nd to the 12th well. A serial dilution was carried out from the 1st well to the 11th well and the 12th well was treated as the positive control. Then, a total of 50 μL of 1% RBC were added to each well before being incubated at room temperature for 30 min. At the end of incubation, the suspension was centrifuged at 500 rpm at 10°C for 10 min.
2.7. In Vitro Red Blood Cell (RBC) Irritation AssayApproximately 2 mL of RBC obtained from a volunteer (Pusat Kesihatan, UPM) and was washed in PBS in a ratio of 1 : 10, followed by centrifuged for 10 min at 1500 rpm with a controlled temperature of 10°C, and this step was repeated triplicate. The RBC was then diluted with PBS to a 1% concentration. Each 100 μL of RB, COM maltodextrin, and Multidex were loaded into the first well in a 96-well plate separately, followed by 50 μL of PBS loaded from the 2nd to the 12th well. A serial dilution was carried out from the 1st well to the 11th well and the 12th well was treated as the positive control. Then, a total of 50 μL of 1% RBC were added to each well before being incubated at room temperature for 30 min. At the end of incubation, the suspension was centrifuged at 500 rpm at 10°C for 10 min.
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