“…The pH value of bee bread is 4.2, mainly due to the formation of lactic acid [86]. Bee bread was reported to have biological activities including antioxidant, antibacterial, antitumor, antihypertensive, neuroprotective, and antiseptic [52,[89][90][91]. Royal jelly consists of flavanones (pinobaskin, pinocembrin, hesperidin, naringin, and naringenin), flavones (acacetin, apigenin, chrysin, and luteolin), flavonols (fisetin, galangin, isorhamnetin, kaempferol, quercetin, and rutin), phenolic acids (caffeic acid, gallic acid, 4-hydroxy-3-methoxyphenylethanol, 4-hydroxybenzoic acid-methyl ester, 4hydroxybenzoic acid, 4-hydroxyhydrocinnamic acid, octanoic acids, 2-hexenedioic acid and its esters, dodecanoic acid and its ester, 1,2-benzenedicarboxylic acid, and benzoic acid) and other phenolic compounds such as hydroquinone, methyl salicylate, 2-methoxyp-cresol, 2-methoxyphenol, and pyrocatechol [48,76].…”