Characterization of a solventless injection interface for supercritical fluid chromatography

Gao, J. Y.; Kibbey, Christopher E.

doi:10.1007/bf02505415

Cited by 6 publications

(2 citation statements)

References 11 publications

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“…The sample solvent is often stronger than the initial mobile phase in SFC methods, and solvent-induced peak broadening places limits on the injection volumes that can be applied. Gao and Kibbey studied the effects of temperature, purge time, purge gas flow rate, precolumn stationary phase, and injection solvent to improve performance of a solvent elimination injection technique (42).…”

Section: Instrumentation Techniques and Performancementioning

confidence: 99%

Supercritical Fluid and Unified Chromatography

Chester

Pinkston

2002

Anal. Chem.

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Section: Instrumentation Techniques and Performancementioning

confidence: 99%

Supercritical Fluid and Unified Chromatography

Chester

Pinkston

2002

Anal. Chem.

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“…Its study districts are located in one of the most impoverished and remote regions of Ghana, where pervasive poverty intersects with high illiteracy and social customs associated with marriage, kinship and family building that were governed more by indigenous traditions than by awareness of modern health care[13]. This setting, therefore, represented an unpromising locality for which any successful experimental research could not be dismissed on the pretext of being a by-product of favorable circumstances and economic trends [14, 15]. The presence of a Health and Demographic Surveillance System (HDSS) for monitoring the mortality, morbidity, fertility and other dynamics in the area has greatly enhanced the contribution of Navrongo research to policy deliberations [16].…”

Section: Introductionmentioning

confidence: 99%

Cost of implementing a community-based primary health care strengthening program: The case of the Ghana Essential Health Interventions Program in northern Ghana

et al. 2019

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BackgroundThe absence of implementation cost data constrains deliberations on consigning resources to community-based health programs. This paper analyses the cost of implementing strategies for accelerating the expansion of a community-based primary health care program in northern Ghana. Known as the Ghana Essential Health Intervention Program (GEHIP), the project was an embedded implementation science program implemented to provide practical guidance for accelerating the expansion of community-based primary health care and introducing improvements in the range of services community workers can provide.MethodsCost data were systematically collected from intervention and non-intervention districts throughout the implementation period (2012–2014) from a provider perspective. The step-down allocation approach to costing was used while WHO health system blocks were adopted as cost centers. We computed cost without annualizing capital cost to represent financial cost and cost with annualizing capital cost to represent economic cost.ResultsThe per capita financial cost and economic cost of implementing GEHIP over a three-year period was $1.79, and $1.07 respectively. GEHIP comprised only 3.1% of total primary health care cost. Health service delivery comprised the largest component of cost (37.6%), human resources was 28.6%, medicines was 13.6%, leadership/governance was 12.8%, while health information comprised 7.5% of the economic cost of implementing GEHIP.ConclusionThe per capita cost of implementing the GEHIP program was low. GEHIP project investments had a catalytic effect that improved community-based health planning and services (CHPS) coverage and enhanced the efficient use of routine health system resources rather than expanding overall primary health care costs.

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Improving injection precision in packed‐column supercritical fluid chromatography

Coym

Chester²

2003

J of Separation Science

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It is often observed that peak area precision in packed column supercritical fluid chromatography (pSFC) is rather poor when compared to values obtained in HPLC. Since the valves used for sample introduction in both techniques are identical, it is reasonable to expect that injection precision should be similar, especially when full‐loop injections are performed. We found that in pSFC the evaporation of the mobile phase from the loop, when decompressed just prior to sample loading, contributes strongly to injection problems. However, these problems can be avoided if the injection valve, sample loop, and associated port tubes are entirely filled with liquid before the sample solution is loaded into the sample loop. By being mindful of the sequence of events that occurs during a full‐loop injection, and by taking into account both the compressible nature and volatility of pSFC mobile phases and the geometry of the injection device, injection precision in pSFC can be comparable to that observed in HPLC.

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Characterization of a solventless injection interface for supercritical fluid chromatography

Cited by 6 publications

References 11 publications

Supercritical Fluid and Unified Chromatography

Supercritical Fluid and Unified Chromatography

Cost of implementing a community-based primary health care strengthening program: The case of the Ghana Essential Health Interventions Program in northern Ghana

Improving injection precision in packed‐column supercritical fluid chromatography

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