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Additionally , we demonstrated that the alginate and Ca2+ caused significant dimensional changes to the 3D printed constructs .
 material: alginate; material: Ca2+; concept or principle: 3D printed constructs
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
 Entities: alginate, Ca2+, 3D printed constructs 
Answer:
 material: alginate; material: Ca2+; concept or principle: 3D printed constructs