Here I send you some articles that disputed this matter and similars:

“The sp2 boron center of boronic acid has a vacant p orbital and in aqueous media, boronic acids interact with a hydroxide ion, which results in a conformational change to sp3 hybridized boronates. The boronate formation is pH dependent. When the pH of the aqueous solution is adjusted to the pKa of boronic acids, the concentration of the boronic acid form is equal to the concentration of the boronate form.

Upon sugar addition, the boronate form binds the hydroxyl groups of sugar to form cyclic ester, resulting in the consumption of the boronate form. (Lorand, J.P.; Edwards, J.O. Polyol complexes and structure of the benzeneboronate ion. J. Org. Chem. 1959, 268, 769–774). The reported pKa of phenylboronic acid is approximately nine. In neutral or weak alkaline solution, a certain degree of the boronate form exists. To maintain the acid-base equilibrium between the boronic acid form and the boronate form, the boronic acid form changes to the boronate form. This structural change upon sugar addition is very important for signaling the mechanism of a chemical sugar sensor based on boronic acids.”

Materials 2014, 7, 1201-1220; doi:10.3390/ma7021201

Y. Egawa , R. Miki and T. Seki

“Boronic acid bind diol tightly but the conditions are not well understood. Due to the multiple ionic states of boronic acid and boronic ester the equilibrium constants reported in literature have not always strictly determined and there is lack of comparability between the reported values.”

Tetrahedron, 2002, 5291

Sprengsteen,G, Wang, B.

“Plausibly, the binding between boronic acids and their target carbohydrates can be monitored with the inclusion of a separate reporter fluorophore whose fluorescence is sensitive to the binding event”

Chem. Commun., 2001, 1608–1609

Sprengsteen,G, Wang, B.

Boronic acids for sensing and other applications - amini-review of papers published in 2013

Chemistry Central Journal 2014, 8:60

K. Lacina, P. Skládal T. D James

Medicinal Research Reviews, Vol. 25, 490-520, 2005

J.Yan, H. Fang,B. Wang

thanks Krassimira Guerra