Table 1.

Bacterial species and strains involved in the metabolism of equol or its intermediate precursors from daidzein.

Species	Strain/s	Origin	Reference
Adlercreutzia equolifaciens	FJC-B9 T	Human feces	Maruo et al. [60]
Asaccharobacter celatus	do03 T	Rat cecum	Minamida et al. [61]
Bifidobacterium breve	ATCC15700 T	Human intestine	Elghali et al. [62]
Bifidobacterium longum	BB536	Human feces	Elghali et al. [62]
Catenibacterium sp.	D1	Human feces	Yu et al. [63]
Clostridium sp.	HGH6 a	Human feces	Hur et al. [64]
Clostridium-like sp.	TM-40 a	Human feces	Tamura et al. [65]
Eggerthella sp.	YY7918	Human feces	Yokoyama and Suzuki [66]
Eggerthella sp.	D2	Human feces	Yu et al. [63]
Eggerthella sp.	Julong 732 b	Human feces	Wang et al. [67]
Eggerthella-like bacteria	SNR48-44, SNR44-10, SNR45-571, SNR46-41, SNR48-350	Stinky tofu	Abiru et al. [54]
Enterorhabdus mucosicola	Mt1B8 T	Mouse ileal mucosa	Matthies et al. [68]
Lactobacillus sp.	Niu-O16 a	Bovine rumen	Wang et al. [67]
Lactobacillus paracasei	CS2 (JS1)	Human feces	Kwon et al. [69]
Lactobacillus sakei/graminis	CS3	Human feces	Kwon et al. [69]
Lactobacillus intestinalis	JCM 7548	Rat feces	Heng et al. [70]
Lactococcus garvieae	20-92	Human feces	Uchiyama et al. [71]
Paraeggerthella sp.	SNR40-432	Stinky tofu	Abiru et al. [54]
Pediococcus pentosaceus	CS1	Human feces	Kwon et al. [69]
Proteus mirabilis	LH-52	Rat intestine	Guo et al. [72]
Slackia equolifaciens	DZE Tc	Human feces	Jin et al. [73]
Slackia isoflavoniconvertens	HE8 Tc	Human feces	Matthies et al. [55]
Slackia sp.	NATTS	Human feces	Tsuji et al. [74]

^a Daidzein to dihydrodaidzein only. ^b Equol from dihydrodaidzein only. ^c These strains are also able to produce 5-hydroxy equol from the isoflavone genistein. The T superscript denotes the isolate as the species type strain.