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Comparative Stability of Vitamin K1 Oral Liquids Prepared in Sterile Water for Injection and Stored in Amber Glass Bottles and Amber Plastic Syringes

Author(s):  Huffman Jessica, Brown Stacy, Lewis Paul, Lawson Sarah, Ogle Amanda, Peacock Gina

Issue:  Jul/Aug 2018 - Volume 22, Number 4
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Abstract:  The purpose of this study was to evaluate the stability of vitamin K1 oral liquids in Sterile Water for Injection when stored in amber glass bottles and amber plastic syringes under refrigerated conditions. Four 100-mL batches of vitamin K1 in Sterile Water for Injection were prepared in amber glass bottles to protect from light. One of the batches was divided into 1-mL aliquots, using amber plastic oral syringes, and capped. The prepared bottles and syringes were stored in a laboratory refrigerator. On each day of sampling, 1-mL aliquots were removed from each bottle and mixed with an equal volume of ethanol. Likewise, the contents of sample syringes were mixed with ethanol to achieve an assay concentration of 0.5 mg/mL. Recovery of vitamin K1 in the compounded samples was quantified against a United States Pharmacopeia reference standard. Quantification was achieved using a stability-indicating high-performance liquid chromatography with ultraviolent light detection method. Product stability is defined as 90% to 110% of the initial concentration. The percent recovery in the Sterile Water for Injection preparations in glass bottles remained above 90% for the 105-day duration of the study, but some samples stored in amber plastic syringes fell below 90% on day 21. Furthermore, a statistically significant difference (2-way ANOVA, P < 0.0001) emerged between syringes at day 0 and day 30, and this trend continued through the day 60, 90, and 105 samples. The only statistically significant difference found within the bottle-stored samples occurred on day 105 (versus zero, P = 0.0465), but the recovery on day 105 still exceeded 90%. Vitamin K1 in Sterile Water for Injection, stored in a refrigerated amber glass bottle, is stable for 105 days. This preparation can also be stored in amber plastic syringes, but this decreases the beyond-use date to 14 days.

Related Keywords: Jessica Huffman, PharmD, Stacy Brown, PhD, Paul Lewis, PharmD, BCPS (AQ-ID), Sarah Lawson, BS, PharmD Candidate, Amanda Ogle, PharmD, Gina Peacock, PhD, vitamin K1, phytonadione, warfarin, INR, blood clotting, bleeding prevention, stability, storage, lipophilic vitamin, polypropylene syringes, glass bottles


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