Table 4.

Cold active β-galactosidases in the hydrolysis of milk. Enzymes from marine microorganisms are in bold.

Source	T (°C)	Time (h)	Amount of Enzyme	Hydrolysis Yield (%)	References
Alteromonas sp. ML52	4	24	44.5 U	90	[52]
Arthrobacter psychrolactophilus F2	10	24	10 U/mL	80	[58]
Arthrobacter sp. ON14	4	8	5.08 U/mL	100	[59]
Arthrobacter sp. 32cB	10	24	2 U/mL	90	[60]
Arthrobacter sp. SB	2.5	7.5	N.A.	80	[57]
Aspergillus oryzae (EYL)	2	24	0.1% (w/v)	85.23	[105]
Cryobacterium sp. LW097 (Bgal322)	4	48	5 U/mL	8.4	[67]
Cryobacterium sp. LW097 (Bgal435)	4	48	5 U/mL	5.1	[67]
Cryobacterium sp. LW097 (Bgal436)	4	48	5 U/mL	N.A.	[67]
Cryobacterium sp. LW097 (Bgal2567)	4	48	5 U/mL	7.8	[67]
Halomonas sp. S62	7	24	0.15 U/10 µL	60	[107]
Kluyveromyces fragilis (LYL)	2	24	0.1% (w/v)	82.96	[105]
Kluyveromyces lactis (DYL)	2	24	0.1% (w/v)	99.08	[105]
Kluyveromyces lactis (VYL)	2	24	0.8% (w/v)	98.59	[105]
Paracoccus sp. 32d	10	11	1 U/mL	91	[63]
Planococcus sp. L4	5	1	2.5 ug	36	[97]
Pseudoalteromonas haloplanktis TAE 79	4	50 min	1.3 U	33	[46]
Pseudoalteromonas sp. 79b	10	8	1U	40	[106]
Pseudoalteromonas sp. 22b	4	48	30 U	65	[85]
Topsoil of Daqing oil field	4	1	1 U	4.2	[66]
Lactococcus lactis	4	9	0.14 U	98	[108]
Immobilized
Pseudoalteromonas sp. 22b	4	24	30 U per g of lactose	93	[85]
Pseudoalteromonas sp. 79b	10	8	1U	40	[106]