▁from ▁the ▁sen na . ▁Fr ang ul in ▁in ▁Fr ang ula ▁al n us . ▁Alo e - em od in ▁in ▁al oe ▁res in . ▁ ▁B ios yn thesis ▁ ▁A ▁type ▁II ▁poly ket ide ▁synth ase ▁is ▁responsible ▁for ▁anth ra quin one ▁b ios yn thesis ▁in ▁the ▁b acter ium ▁Phot or hab d us ▁lum ines c ens . ▁Chor ism ate , ▁formed ▁by ▁is och or ism ate ▁synth ase ▁in ▁the ▁sh ik imate ▁path way , ▁is ▁an ▁important ▁prec ursor ▁of ▁anth ra quin ones ▁in ▁Mor inda ▁cit rif olia . ▁ ▁Test ▁for ▁anth ra quin ones ▁in ▁natural ▁extract s ▁▁▁ 0 . 5 g ▁of ▁plant ▁extract ▁is ▁sh aken ▁with ▁ 1 0 ▁m l ▁of ▁ben z ene ▁and ▁filtered . ▁ 5 ml ▁of ▁ 1 0 % ▁am mon ia ▁is ▁added ▁to ▁the ▁fil tr ate . ▁The ▁mixture ▁is ▁sh aken ▁and ▁the ▁presence ▁of ▁p ink , ▁red ▁or ▁vio let ▁colour ▁indicates ▁the ▁presence ▁of ▁anth ra quin ones . ▁ ▁Der iv atives ▁ ▁Hyper ic in ▁and ▁f ag opy rin ▁are ▁nap h th od ian th ron es , ▁anth ra quin one - der iv atives . ▁ ▁App lications ▁ ▁Many ▁qu in ones ▁are ▁stable ▁in ▁multiple ▁re do x ▁states ; ▁as ▁such ▁they ▁can ▁abs orb ▁electrons ▁when ▁appropriate ▁counter ions ▁are ▁available ▁to ▁maintain ▁the ▁bulk