# US 2013/0156931 A1 · Coagulant control for producing tofu

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- Number: US 2013/0156931 A1
- Document ID: US20130156931A1
- Status: Published application
- Kind: A1
- Application number: 13/814,885
- Filed: 2011-09-05
- Published: 2013-06-20
- Earliest claimed: 2010-09-07
- Assignees: Koninklijke Philips Electronics N.V.
- Inventors: Changjie Wang; Qi Zhou; Declan Patrick Kelly
- Web page: https://patentgrep.com/patent/US20130156931A1

## CPC

- A23L 11/45: Soy bean curds, e.g. tofu
- G01N 27/10: Investigation or analysis specially adapted for controlling or monitoring operations or for signalling
- A23L: FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES, NOT OTHERWISE PROVIDED FOR; PREPARATION OR TREATMENT THEREOF (preservation thereof A23B)
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)

## Abstract

The invention proposes a method and apparatus for producing tofu. The apparatus comprises a first unit (100) for obtaining the electric conductivity of the water; a generator (102) for generating soymilk from soybeans and water; a first detector (104) for detecting the electric conductivity of the soymilk; a calculator (106) for calculating the amount of coagulant to be added to the soymilk, in dependence on the obtained electric conductivity of the water and the detected electric conductivity of the soymilk; and a second unit (108) for adding coagulant to the soymilk in dependence on the calculated amount. The obtained electric conductivity of the water and the detected electric conductivity of the soymilk can reflect the soymilk concentration. Thus, for each tofu-making process, the invention flexibly calculates a suitable amount of the coagulant, even if the soymilk concentration varies. The taste as well as the texture of tofu can be consistent irrespective of the soymilk concentration.

## Claims

### Claim 1

A method of producing tofu from soybeans and water, the method comprising the steps of:
obtaining the electric conductivity of the water;
generating soymilk from soybeans and water;
detecting the electric conductivity of the soymilk;
calculating the amount of coagulant to be added to the soymilk in dependence on the obtained electric conductivity of the water and the detected electric conductivity of the soymilk;
adding coagulant to the soymilk in dependence on the calculated amount.

### Claim 2 (depends on 1)

The method according to claim 1, wherein in the generating step raw soymilk is generated from soybeans and water, the method further comprising the step of:
heating the raw soymilk to obtain cooked soymilk;
wherein in the detecting step the electric conductivity is detected of either raw soymilk or the cooked soymilk.

### Claim 3 (depends on 1)

The method according to claim 1, wherein the obtaining step comprises any one of the following steps:
detecting the electric conductivity of the water;
retrieving the electric conductivity of the water from stored data;
receiving data related to the electric conductivity of the water.

### Claim 4 (depends on 1)

The method according to claim 1, wherein in the calculating step the amount of coagulant is calculated in dependence on the difference between the obtained electric conductivity of the water and the detected electric conductivity of the soymilk.

### Claim 5 (depends on 4)

The method according to claim 4, wherein in the calculating step the amount of coagulant is further calculated in dependence on data related to a user's preferred taste or texture.

### Claim 6

An apparatus for producing tofu from soybeans and water, comprising:
a first unit for obtaining the electric conductivity of the water;
a generator for generating soymilk from the soybeans and the water;
a first detector for detecting the electric conductivity of the soymilk;
a calculator for calculating the amount of coagulant to be added to the soymilk in dependence on the obtained electric conductivity of the water and the detected electric conductivity of the soymilk;
a second unit for adding coagulant to the soymilk in dependence on the calculated amount.

### Claim 7 (depends on 6)

The apparatus according to claim 6, wherein the first unit comprises any one of the following:
a second detector for detecting the electric conductivity of the water;
a third unit for retrieving the electric conductivity of the water from data stored in a memory in the apparatus;
a receiver for receiving data related to the electric conductivity of the water.

### Claim 8 (depends on 6)

The apparatus according to claim 6, wherein the calculator calculates the amount of coagulant in dependence on the difference between the obtained electric conductivity of the water and the detected electric conductivity of the soymilk.

### Claim 9 (depends on 6)

The apparatus according to claim 6, wherein the generator generates raw soymilk from soybeans and water, the apparatus further comprising:
a heater for heating the raw soymilk to obtain cooked soymilk;
wherein the first detector is used for detecting the electric conductivity of either the raw soymilk or the cooked soymilk.

### Claim 10 (depends on 9)

The apparatus according to claim 9, wherein the calculator additionally calculates the amount of coagulant in dependence on data related to a user's preferred taste or texture.

### Claim 11

A method of controlling the amount of coagulant to be added to soymilk for producing tofu from soybeans and water, comprising the steps of:
obtaining the electric conductivity of the water;
detecting the electric conductivity of the soymilk;
calculating the amount of coagulant to be added to the soymilk in dependence on the obtained electric conductivity of the water and the detected electric conductivity of the soymilk.

### Claim 12 (depends on 11)

The method according to claim 11, wherein in the calculating step the amount of the coagulant is calculated in dependence on the difference between the obtained electric conductivity of the water and the detected electric conductivity of the soymilk.

### Claim 13 (depends on 1)

A device according to claim 1, wherein the controlling the amount of coagulant to be added to soymilk for producing tofu from soybeans and water, comprising:
a first unit for obtaining the electric conductivity of the water;
a first detector for detecting the electric conductivity of the soymilk;
a calculator for calculating the amount of coagulant to be added to the soymilk in dependence on the obtained electric conductivity of the water and the detected electric conductivity of the soymilk.

### Claim 14 (depends on 13)

The device according to claim 13, wherein the calculator calculates the amount of coagulant in dependence on the difference between the obtained electric conductivity of the water and the detected electric conductivity of the soymilk.