How does intestinal juice contribute to the digestion of proteins? What provides an alkaline pH in the small intestine?

How does intestinal juice contribute to the digestion of proteins? What provides an alkaline pH in the small intestine?

Intestinal juice: Succes entricus: it contains proteins, sugar and fat digesting enzymes as:

Dipeptidases + Reptides Smaller Peptides + Amino acids.
Maltase + Maltose Glucose + Glucose
Sucrase + Sucrose Glucose + Fructose
Lactase + Lactose Glucose + Galactose
Lipase + Tryglycerides Monoglycerides + Fatty Acids.

Bile provides alkaline medium in intestine.