Spatial metabolomic profiling of ripening pepper fruit (Capsicum annuum L.) by MALDI-MSI: Decoding metabolic heterogeneity and its role in quality attribute regulation - Yuanling Yang; Chaochao Liu; Zhuping Yao; Chenxu Liu; Meiying Ruan; Rongqing Wang; Hongjian Wan; Qingjing Ye; Zhimiao Li; Ming Diao; Yuan Cheng (Food Chemistry, 2026)