LPT-0003
QUESTION
In the HTST type of pasteurization of milk, the temperature and time is?
OPTIONS
(A) 63℃ /30 minutes
(B) 72℃ /15 minutes
(C) 72℃ /15 seconds
(D) 74℃ /7 seconds
ANSWER
(C) 72℃ /15 seconds
EXPLANATION
High-temperature short-time (HTST) pasteurization conventionally heats milk to about 72°C for 15 seconds, followed by rapid cooling. Heating at about 63°C for 30 minutes is the holder or LTLT method, while 72°C for 15 minutes and 74°C for 7 seconds are not the standard HTST time-temperature combination. Thus, option (C) is correct.
Question Navigator
Livestock Products Technology · 202 Questions
3
/
202
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202