Reivindicaciones

1. A process of obtaining an enzymatic product with α-glucosidase activity, which comprises culturing Xanthophyllomyces dendrorhous cells in an appropriate medium and under appropriate conditions. 2. The process according to claim 1, which further comprises the step of recovering the enzymatic product from the culture medium and/or from the cells. 3. The process according to any of claims 1 and 2, wherein the Xanthoiphyllomyces dendrorhous cells belong to a strain selected from the group consisting of ATCC:MYA-131, ATCC 24230, CECT 11028 and CECT 1690. 4. An enzymatic product with α-glucosidase activity obtainable by means of the process as defined in any of claims 1-3. 5. The enzymatic product according to claim 4, characterized in that the α-glucosidase activity has low substrate specificity, acting on maltose, maltotriose, maltoheptose, dextrins, X-α-glucoside, glycogen and soluble starch. 6. The enzymatic product according to any of claims 4 and 5, characterized in that it does not have α-glucosidase activity on isomaltose, isomaltotriose, pullulan and dextran. 7. The enzymatic product according to any of claims 4-6, wherein the α-glucosidase activity shows a maximum value in the pH interval between 4.5 and 6.0 at 42 °C, and in a temperature interval of 40 to 50 °C. 8. The enzymatic product according to any of claims 4-7, characterized in that it has glycosyltransferase activity in the presence of one or several glucidic substrates. 9. The enzymatic product according to claim 8, characterized in that the glucidic substrates are maltooligosaccharides. 10. The enzymatic product according to claim 9, wherein the products resulting from the glycosyltransferase activity are oligosaccharides with α-1,4 bonds, oligosaccharides with α-1,6 bonds and/or mixed oligosaccharides with α-1,4 and α-1,6 bonds. 11. The enzymatic product according to claim 10, wherein the products resulting from the glycosyltransferase activity are maltotriose, maltotetraose, isomaltose, panose and/or the tetrasaccharide α-D-Glu-(1→6)-α-D-Glu-(1→4)-α-D-Glu-(1→4)-α-D-Glu). 12. A process of obtaining oligosaccharides which comprises allowing the enzymatic product as defined in any of claims 4-11 to act on one or several glucidic substrates. 13. A process of obtaining an enzymatic product with α-glucosidase activity, according to any of the claims 2-3, which further comprises a step (c) of purifying the enzymatic product until obtaining a substantially pure enzyme. 14. A substantially pure enzyme with α-glucosidase activity obtainable by means of the process as defined in claim 13. 15. The enzyme according to claim 14, characterized in that the α-glucosidase activity has low substrate specificity, acting on maltose, maltotriose, maltoheptose, dextrins, X-α-glucoside, glycogen and soluble starch. 16. The enzyme according to any of claims 14 and 15, characterized in that it does not have α-glucosidase activity on isomaltose, isomaltotriose, pullulan and dextran. 17. The enzyme according to any of claims 14-16, wherein the α-glucosidase activity has a maximum value in the pH interval between 4.5 and 6.0 at 42 °C, and in a temperature interval between 40 and 50 °C. 18. The enzyme according to any of claims 14-17, characterized in that it has glycosyltransferase activity in the presence of one or several glucidic substrates. 19. The enzyme according to claim 18, characterized in that the glucidic substrates are maltooligosaccharides. 20. The enzyme according to claim 19, wherein the products resulting from the glycosyltransferase activity are oligosaccharides with α-1,4 bonds, oligosaccharides with α-1,6 bonds and/or mixed oligosaccharides with α-1,4 and α-1,6 bonds. 21. The enzyme according to claim 20, wherein the products resulting from the glycosyltransferase activity are maltotriose, maltotetraose, isomaltose, panose and/or the tetrasaccharide α-D-Glu-(1→6)-α-D-Glu-(1→4)-α-D-Glu-(1→4)-α-D-Glu). 22. The enzyme according to any of claims 14-21, characterized by having a molecular weight of about 115 kDa calculated by molecular filtration, and an isoelectric point of about 5.5. 23. A process of obtaining oligosaccharides which comprises allowing the enzyme defined in any of claims 14-22 to act on one or several glucidic substrates.