Bacterial Spoilage and its Prevention in Packed Dairy Products
Bacterial Spoilage and its Prevention in Packed Dairy Products
-
9折 697元
774元
-
預計最高可得金幣30點
?
可100%折抵
活動加倍另計 -
HAPPY GO享100累1點 4點抵1元折抵無上限
- 作者： Baha Hamdi Hakiem,Al-Amiedi 追蹤 ? 追蹤作者後，您會在第一時間收到作者新書通知。
- 出版社： JPS Scientific Publications, Ind 追蹤 ? 追蹤出版社後，您會在第一時間收到出版社新書通知。
- 出版日：2021/10/18
配送方式
-
台灣
- 國內宅配：本島、離島
-
到店取貨：
不限金額免運費
-
海外
- 國際快遞：全球
-
港澳店取：
內容簡介
In the present research, five different locations were selected for the collection of dairy product samples. Five different bacteria were isolated and the identified bacterial isolates were Listeria sp., Yersinia sp., Campylobacter sp., Staphylococcus sp. and Pseudomonas sp. The species level identification of the five bacterial isolates were subjected to Phylogenetic analysis (16S rRNA Sequencing). The Listeria sp. was identified as Listeria monocytogenes, Yersinia sp. was Yersinia enterocolitica, Campylobacter sp. was identified as Campylobacter jejuni, Staphylococcus sp. was Staphylococcus aureus and Pseudomonas sp. was identified as Pseudomonas fluorescens. The effects of different concentrations of organic acids (Acetic acid, Lactic acid and Sorbic acid) and chemical preservatives (Potassium sorbate, Sodium nitrate and Sodium propionate) on the growth of the dairy product spoilage bacterial strains were studied. Highest zone of inhibition was recorded against Listeria monocytogenes, Staphylococcus aureus, Yersinia enterocolitica and Pseudomonas aeruginosa. The effect of culture filtrate and crude bacteriocin of Lactobacillus lactis and Lactobacillus acidophilus on the inhibition of growth of five dairy spoilage bacterial strains was studied. The diameter of the inhibition zone of all the bacterial strains was increased with increase in concentration of culture filtrate from 20 to 100 繕g ml-1. Highest zone of inhibition was observed against Listeria monocytogenes, Staphylococcus aureus, Yersinia enterocolitica and Pseudomonas aeruginosa. Lowest zone of inhibition was recorded in Campylobacter jejuni. The Minimum inhibitory concentration (MIC) of crude bacteriocin of Lactobacillus lactis against all the dairy spoilage bacterial strains was assessed. The Campylobacter jejuni recorded lower MIC (50 繕l) followed by Pseudomonas aeruginosa (60 繕l), Yersinia enterocolitica (70 繕l), Staphylococcus aureus (80 繕l) and Listeria monocytogenes (90 繕l) was inhibited. The inhibitory effect of heat stability of crude bacteriocin (extracted from Lactobacillus lactis and Lactobacillus acidophilus) at various time intervals and different temperatures against dairy product spoilage bacteria were studied. The inhibitory activity was unaffected by heating upto 120 簞C for 40 min and 70 % of activity retained after heat treatment at 120 簞C for 15 min. More inhibition was noted in 15 min time interval at 20 簞C followed by 40 簞C, 60 簞C, 80 簞C, 100 簞C and 120 簞C. The inhibitory effect of surfactant on stability of crude bacteriocin Lactobacillus lactis and Lactobacillus acidophilus against dairy product spoilage bacteria was studied. Among the various surfactants at various concentrations of 0.2, 0.4, 0.6, 0.8 and 1.0 per cent, HDTMEB exhibited more inhibitory activity against dairy product spoilage bacteria followed by SDS, EDTA, TWEEN 80 and TWEEN 20. The inhibitory effect of metal ion on crude bacteriocin on Lactobacillus lactis and Lactobacillus acidophilus against dairy product spoilage bacteria was studied at various concentrations viz., 5 mg/L, 10 mg/L, 15 mg/L, 20 mg/L and 25 mg/L. It was observed that the inhibition zone diameter was decreased while the concentration of the metal ion was increased. Of the various metal ion tested, Copper sulphate showed maximum inhibitory effect against Listeria monocytogenes at 5 mg/L concentration followed by Ferrous sulphate, Calcium chloride, Zinc sulphate and Mercuric chloride.
訂購/退換貨須知
加入金石堂 LINE 官方帳號『完成綁定』，隨時掌握出貨動態：
商品運送說明：
- 本公司所提供的產品配送區域範圍目前僅限台灣本島。注意！收件地址請勿為郵政信箱。
- 商品將由廠商透過貨運或是郵局寄送。消費者訂購之商品若無法送達，經電話或 E-mail無法聯繫逾三天者，本公司將取消該筆訂單，並且全額退款。
- 當廠商出貨後，您會收到E-mail出貨通知，您也可透過【訂單查詢】確認出貨情況。
- 產品顏色可能會因網頁呈現與拍攝關係產生色差，圖片僅供參考，商品依實際供貨樣式為準。
- 如果是大型商品（如：傢俱、床墊、家電、運動器材等）及需安裝商品，請依商品頁面說明為主。訂單完成收款確認後，出貨廠商將會和您聯繫確認相關配送等細節。
- 偏遠地區、樓層費及其它加價費用，皆由廠商於約定配送時一併告知，廠商將保留出貨與否的權利。
提醒您！！
金石堂及銀行均不會請您操作ATM! 如接獲電話要求您前往ATM提款機，請不要聽從指示，以免受騙上當！
退換貨須知：
**提醒您，鑑賞期不等於試用期，退回商品須為全新狀態**
-
依據「消費者保護法」第19條及行政院消費者保護處公告之「通訊交易解除權合理例外情事適用準則」，以下商品購買後，除商品本身有瑕疵外，將不提供7天的猶豫期：
- 易於腐敗、保存期限較短或解約時即將逾期。（如：生鮮食品）
- 依消費者要求所為之客製化給付。（客製化商品）
- 報紙、期刊或雜誌。（含MOOK、外文雜誌）
- 經消費者拆封之影音商品或電腦軟體。
- 非以有形媒介提供之數位內容或一經提供即為完成之線上服務，經消費者事先同意始提供。（如：電子書、電子雜誌、下載版軟體、虛擬商品…等）
- 已拆封之個人衛生用品。（如：內衣褲、刮鬍刀、除毛刀…等）
- 若非上列種類商品，均享有到貨7天的猶豫期（含例假日）。
- 辦理退換貨時，商品（組合商品恕無法接受單獨退貨）必須是您收到商品時的原始狀態（包含商品本體、配件、贈品、保證書、所有附隨資料文件及原廠內外包裝…等），請勿直接使用原廠包裝寄送，或於原廠包裝上黏貼紙張或書寫文字。
- 退回商品若無法回復原狀，將請您負擔回復原狀所需費用，嚴重時將影響您的退貨權益。
商品評價