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Karakosta T, Wan Y, Truong D. Establishing preanalytical stability of vitamin A and vitamin E. Clin Biochem 2022:S0009-9120(22)00295-8. [PMID: 36574897 DOI: 10.1016/j.clinbiochem.2022.12.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2022] [Revised: 12/20/2022] [Accepted: 12/22/2022] [Indexed: 12/25/2022]
Abstract
Vitamin A and Vitamin E, a group of lipid-soluble vitamins, can be degraded by photolysis and photooxidation after exposure to light. As an essential area of the preanalytical stage, inappropriate storage conditions of patient samples could lead to inaccurate results. In this study, we evaluated three of the most common preanalytical storage conditions (RT, +4°C, and -20 °C) in the workflow in the clinical laboratory setting using both clear and amber Eppendorf tubes. Analyte stability in each storage condition was tested with five patient pools. After 24 hrs at RT, a significant decrease in vitamin A and E was observed for samples stored in clear Eppendorf tubes (19.2 % and 17.9 %, for vitamin A and E, respectively), compared with samples stored in amber Eppendorf tubes (9.1 % and 7.3 %), respectively. After the specimen was stored at 4 °C for 7 days, vitamin A concentrations decreased in clear tubes by 14.7 % and in amber tubes by 12.7 %. Similarly, vitamin E concentrations decreased in both clear and amber tubes by 11.2 % and 13.4 %, respectively. Both vitamin A and vitamin E demonstrated acceptable stability in clear and amber Eppendorf tubes at -20 °C for up to 22 days. It is preferable to use amber tubes to protect vitamin A and E from light during short term storage. Storage of vitamin A and E specimens beyond 7 days should be at -20 °C.
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Nakyinsige K, Fatimah AB, Aghwan ZA, Zulkifli I, Goh YM, Sazili AQ. Bleeding Efficiency and Meat Oxidative Stability and Microbiological Quality of New Zealand White Rabbits Subjected to Halal Slaughter without Stunning and Gas Stun-killing. Asian-Australas J Anim Sci 2014; 27:406-13. [PMID: 25049968 PMCID: PMC4093272 DOI: 10.5713/ajas.2013.13437] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/19/2013] [Revised: 11/16/2013] [Accepted: 10/29/2013] [Indexed: 11/27/2022]
Abstract
A study was conducted to compare the effect of halal slaughter without stunning and gas stun killing followed by bleeding on residual blood content and storage stability of rabbit meat. Eighty male New Zealand white rabbits were divided into two groups of 40 animals each and subjected to either halal slaughter without stunning (HS) or gas stun-kill (GK). The volume of blood lost during exsanguination was measured. Residual blood was further quantified by determination of haemoglobin content in Longissimus lumborum (LL) muscle. Storage stability of the meat was evaluated by microbiological analysis and measuring lipid oxidation in terms of thiobarbituric acid reactive substances (TBARS). HS resulted in significantly higher blood loss than GK. HS had significantly lower residual haemoglobin in LL muscle compared to GK. Slaughter method had no effect on rabbit meat lipid oxidation at 0, 1, and 3 d postmortem. However, at 5 and 8 days of storage at 4°C, significant differences (p<0.05) were found, with meat from the GK group exhibiting significantly higher levels of MDA than that from HS. At day 3, greater growth of Pseudomonas aeroginosa and E. coli were observed in the GK group (p<0.05) with B. thermosphacta and total aerobic counts remained unaffected by slaughter method. At days 5 and 7 postmortem, bacterial counts for all tested microbes were affected by slaughter method, with GK exhibiting significantly higher growth than HS. It can be concluded that slaughter method can affect keeping quality of rabbit meat, and HS may be a favourable option compared to GK due to high bleed out.
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Affiliation(s)
- K. Nakyinsige
- Halal Products Research Institute, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor Darul Ehsan,
Malaysia
- Department of Food Science and Nutrition, Islamic University in Uganda, P.O. Box 2555, Mbale,
Uganda
| | - A. B. Fatimah
- Department of Food Science, Faculty of Food Science and Technology, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor Darul Ehsan,
Malaysia
| | - Z. A. Aghwan
- Department of Animal Science, Faculty of Agriculture, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor Darul Ehsan,
Malaysia
- Department of Animal Science, University of Mosul, Mosul,
Iraq
| | - I. Zulkifli
- Halal Products Research Institute, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor Darul Ehsan,
Malaysia
- Department of Animal Science, Faculty of Agriculture, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor Darul Ehsan,
Malaysia
- Institute of Tropical Agriculture, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor Darul Ehsan,
Malaysia
| | - Y. M. Goh
- Department of Veterinary Preclinical Sciences, Faculty of Veterinary Medicine, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor Darul Ehsan,
Malaysia
| | - A. Q. Sazili
- Halal Products Research Institute, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor Darul Ehsan,
Malaysia
- Department of Animal Science, Faculty of Agriculture, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor Darul Ehsan,
Malaysia
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