Mokhalalati Jalal K, Druyan Mary E, Shott Susan B, Comer Gail M
Global Nutrition and Healthcare Consulting, Ottawa, Ontario, Canada.
Saudi Med J. 2004 Mar;25(3):331-41.
Blenderized tube feedings (BTF) may present disadvantages over commercially prepared formulas (CPF). This study compares the microbial safety, nutritional content, and physical properties of BTF versus CPF.
A total of 18 samples of BTF were collected from 3 hospitals in the Kingdom of Saudi Arabia from August 1999 through to November 1999. Samples of a CPF were collected for comparison. All samples were analyzed for nutritional content, microbial quality (aerobic plate counts, coliform counts, microorganism growth) and physical characteristics (viscosity, osmolality).
The nutrient content of BTF varied significantly within and between sites. The average intra site variability for all sites ranged from 16-50%. The average variability of the CPF was 4-7%. Between sites, the mean concentration of most nutrients varied by 2-3 fold. The BTF had considerable differences between actual and expected nutrient concentrations, reaching statistical significance in 12 nutrients. The measured concentration of most nutrients in the CPF was within 10% of expected values. The BTF samples had higher viscosity and osmolality than the CPF. All samples of BTF had detectable aerobic plate counts that increased significantly over 4 hours (p<0.0005). Coliform contamination varied between sites, with 100% contamination at one site. No aerobic plate counts or coliform counts were detected in the CPF samples.
There is a high degree of variability in nutrient content and physical properties with BTF. Furthermore, BTF are highly contaminated, increasing the risk of nosocomial infections. For these reasons, CPF should replace BTF.
混合匀浆管饲流食（BTF）可能比商业制备配方食品（CPF）存在更多劣势。本研究比较了BTF和CPF的微生物安全性、营养成分及物理特性。
1999年8月至1999年11月期间，从沙特阿拉伯王国的3家医院共采集了18份BTF样本。采集CPF样本用于比较。对所有样本进行营养成分、微生物质量（需氧平板计数、大肠菌群计数、微生物生长情况）及物理特性（粘度、渗透压）分析。
BTF的营养成分在不同地点间及同一地点内均存在显著差异。所有地点的平均内部变异性在16%至50%之间。CPF的平均变异性为4%至7%。不同地点间，大多数营养成分的平均浓度相差2至3倍。BTF的实际营养浓度与预期浓度存在显著差异，12种营养成分达到统计学显著水平。CPF中大多数营养成分的测量浓度在预期值的10%以内。BTF样本的粘度和渗透压高于CPF。所有BTF样本均检测到需氧平板计数，且在4小时内显著增加（p<0.0005）。大肠菌群污染在不同地点有所不同，一个地点的污染率为100%。CPF样本中未检测到需氧平板计数或大肠菌群计数。
BTF在营养成分和物理特性方面存在高度变异性。此外，BTF受到严重污染，增加了医院感染的风险。基于这些原因，CPF应取代BTF。
