RU2374950C1 - Marrows preservation method - Google Patents

Abstract

FIELD: food industry.

SUBSTANCE: invention is related to preserved food industry. Marrows are put in jars, jars are filled with brine at 97°C and put in microwave oven for 120-130 seconds. Jars is processed in microwave chamber during 90-100 seconds, sealed and sterilised in autoclave according to the new preset mode.

EFFECT: invention allows to decrease sterilisation duration and enhance treatment uniformity.

1 ex

Description

The proposed method for the invention relates to the canning industry, and in particular to methods of preserving zucchini canned in cans SKO 1-82-1000.

The sources that were searched for by this method showed that its prototype is the method [1], the essence of which is that the prepared cans with the product after packaging, filling and seaming are subjected to heat sterilization in an autoclave according to the regime (for SKO 1 can -82-1000):

where 20 is the duration of heating the water in the autoclave to 100 ° C, min;

8 - the duration of their own sterilization, min;

25 - cooling time, min;

147-177 - back pressure in the autoclave, kPa.

The main disadvantages of this method are:

- long duration of the process of heat treatment of the product;

- uneven heat treatment of the product in banks;

- a relatively large consumption of thermal energy.

The aim of the proposed method is to reduce the duration of the heat treatment process, reduce the unevenness of heat treatment, improve the quality of the finished product and save heat energy.

This goal is achieved due to the fact that, according to the proposed method, cans with packaged zucchini are placed in the microwave chamber at a frequency of 2400 ± 50 MHz before pouring for 120-130 s, after which the brine, the temperature of which is not lower than 97 ° C, is poured again A microwave camera with a frequency of 2400 ± 50 MHz for 90-100 s is sealed and sent for sterilization to an autoclave.

An example implementation of the method:

Prepared zucchini is packaged in cans, and they are placed for 120-130 s in a microwave chamber, where an electromagnetic field with a frequency of 2400 ± 50 MHz is excited with a magnetron.

After microwave processing, the brine is poured into cans at a temperature of at least 97 ° C and re-placed in the microwave chamber for 90-100 s and the contents of the can are heated to 95-96 ° C. Next, the banks are sealed and sent for sterilization in an autoclave. After exposure for 30 minutes (the permissible exposure time of the rolled cans before sterilization), the temperature in the center of the can was 84 ° C, and when canning according to the method of the current technological instruction, the temperature of the product in the center of the can is 46 ° C.

Thus, the initial temperature of the product according to the proposed method before sterilization is 84 ° C, i.e. 38 ° C more than the canning method according to the current technological instructions.

In the center of the can, the temperature is 84 ° C during sterilization according to the regime of the current technological instruction, it reaches only 12-15 minutes after the start of the thermal sterilization process.

In addition, when sterilizing according to the regime of the current technological instruction, the temperature difference between the central and peripheral points of the product in the bank after 12 minutes from the start of sterilization is already 7-8 ° C, which further increases, reaching up to 10-11 ° C, and accordingly, the magnitudes of the sterilizing effects for these points are different.

During sterilization by the proposed method, the heating of the product in an autoclave begins with a temperature almost equal in the center and periphery, equal to 84 °, and with further heating, the temperature difference between the center and the periphery is reached up to 8 ÷ 9 ° ^. An increase in the initial temperature of the product in the cans before sterilization allows, firstly, to increase the initial temperature of the water in the autoclave before loading the cans for sterilization by up to 38 ° C compared with the initial temperature of the water in the autoclave during sterilization according to the regime of the current technological instruction, and, -secondly, it allows cooling the canned food to a final temperature in two stages, without causing the caps to come off from the cans, since the pressure arising in the cans during sterilization by the proposed method is due to the high temperature of the product during sealing is slightly lower than during sterilization according to the regime of the current technological instruction.

In connection with the aforementioned, we propose to cool canned food during sterilization according to the proposed method in two stages: in the first autoclave, where the process is heated to the sterilization temperature and held, cool the canned food to an autoclave water temperature of 55 ° C, i.e. 15 ° C more than the regime of the current technological instruction, followed by continued cooling in another autoclave or container without backpressure and a water temperature of 40 ° C.

This cooling method allows, firstly, significantly saving thermal energy for heating water in an autoclave before loading another batch of canned food, since in this case the water will be heated not from 40 ° C, as is accepted according to the regime of the current technological instruction, but from 55 ° C, and, in addition, there is a saving of cooling water.

с последующим продолжением охлаждения в другом автоклаве или емкости по режиму

.The sterilization mode of canned food in an autoclave according to the proposed method can be expressed as follows:

followed by continued cooling in another autoclave or tank according to the mode

.

where 5 is the duration of heating the water in the autoclave from 90 ° to 100 ° C, min .;

8 - the length of the period of its own sterilization at 100 ° C of water, min .;

20 - the duration of the period of cooling water in an autoclave from 100 ° C to 55 ° C, min;

5 - the duration of cooling in a second autoclave or tank at 40 ° C min;

90 - the initial temperature of the water in the autoclave before loading canned food, ° C;

100 - sterilization temperature, ° C;

55 - final water temperature in the first autoclave, ° C;

40 - water temperature in the second autoclave or container, ° C;

147-177 - back pressure in the first autoclave, kPa.

The salient features of the proposed method are: preheating the zucchini in cans before pouring brine in the microwave chamber for 120-130 s, pouring the brine with a temperature of at least 97 ° C, re-placing in the microwave chamber for 90-100 s followed by sealing and autoclave sterilization according to the new regime.

The mode provides a reduction in the duration of the process of thermal sterilization, saving heat energy and water, as well as improving the quality of the finished product.

Literature

1. A collection of technological instructions for the production of canned food, t.1, - M .: Food industry, 1990

Claims (1)

A method of preserving zucchini, characterized in that the zucchini after preliminary preparation and packaging in cans before pouring the brine is treated with a microwave field with a frequency of 2400 ± 50 MHz for 120-130 s, then pour brine heated to a temperature of at least 97 ° C, after which is re-treated with a microwave field with a frequency of 2400 ± 50 MHz for 90-100 s, followed by sealing and sterilization in an autoclave according to the regime

followed by continued cooling in another autoclave or tank according to the mode

.