Systems and methods are provided that can include a storage and retrieval robot operating under program control to extract a selective number of support beads from a storage or retainment region, for dispensing to titer wells or other vessels for assays and other purposes. According to various embodiments, the storage and retrieval robot can position a capture device over any one or more storage wells containing oligonucleotide or other material support beads, and withdraw or extract those support beads into a collection tube under vacuum pressure or other force. According to various embodiments, a selected number of support beads can be extracted, using a linear motor piston to limit available space for support bead insertion. According to various embodiments, the collected support beads can be dispensed into one or more destination tubes, wells, or other containers, surfaces, vessels, receptacles or mixture containment region, for use in assays or other purposes. According to various embodiments, a calculated plurality of support beads can be extracted or mixed in selective quantities. According to various embodiments, a sample subset of the supply support beads can be taken, to calculate an amount of actual oligonucleotide contained in the support beads. According to various embodiments, an adjustment or normalization of the number of support beads dispensed can be performed to compensate for variations in oligonucleotide amount, thereby enhancing the uniformity of concentration in solution.