Fig. 3From: High-throughput interspecies profiling of acidic plant hormones using miniaturised sample processingThe impact of acidification on process efficiency (PE). PE (mean area of IS spike before extraction and purification / mean area of IS spike without extraction and purification injected in the same amount × 100) was estimated using 2 mg FW of 10-day-old Arabidopsis thaliana seedlings. Error bars represent ± SD, n = 4Back to article page