TABLE 1.

Mass and energy balances for synthesis of PGA from MTBE and ETBE^a

Route	MTBE or ETBE	Substrate	Variantb								Equation no.
			Moles consumed				Moles gained
			ATP	O2	H2O	→	PGA	CO2	[H2]	[H2]*
1 or 2	MTBE	1	2	3	1		1	2	4	0	7a (3a + 4b)
	ETBE	1	3	3	1		1	3	6	1	7b (3b + 4b)
4	MTBE	1	3	2	3		1	2	5	1	8a (3a + 5)
	ETBE	1	4	2	3		1	3	7	2	8b (3b + 5)
3b	MTBE	1	1	2	3		1	2	5	1	9 (3a + 6a)
3a	MTBE	1	2	2	3		1	2	5	1	10 (3a + 6b)

^a[H₂] → (P/O)ATP; [H₂]* → (P/O − 1)ATP.

^bBased on the pathways indicated in Fig. 2; for equations 3 to 6, see the text.