Escaping text / hstore

Maybe somebody have an idea how to escape text string for use in hstore column? I have tried $$ and quote_literal in audit trigger function, but still db won't let me pass values with // or ' to the hstore... INSERT FROM trigger function:

   EXECUTE 'INSERT INTO history.' || TG_TABLE_SCHEMA || '_' || TG_TABLE_NAME || l_table_suffix ||           '(operation, event_time, executed_by, new_value)                VALUES(''' || TG_OP || ''', ''' || CURRENT_TIMESTAMP || ''', ''' || SESSION_USER || ''', $$''' ||           hstore(NEW) || '''$$)';

During insert occurs error:

INSERT INTO my_table ("some_id", "someother_id","description") VALUES (1751, 10907,'gdfddfg''gdfg');

The same occurs with backslash:

INSERT INTO my_table ("some_id", "someother_id","description") VALUES (1751, 10907,'gdfddfg//gdfg');

ERROR:  Syntax error near ''' at position 73
LINE 2: ..., '2015-10-20 15:41:08.534645+02', 'my_user', $$'"some...                                                            ^
QUERY:  INSERT INTO history.public_my_table_2015_10(operation, event_time, executed_by, new_value)                VALUES('INSERT', '2015-10-20 15:41:08.534645+02', 'my_user', $$'"some_id"=>"1751", "someother_id"=>"10907", "description"=>"gdfddfg'gdfg"'$$)
CONTEXT:  PL/pgSQL function insert() line 6 at EXECUTE statement

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